Onset of the Next Glaciation

Guest post by David Archibald

Baby boomers like me have enjoyed the most benign period in human history. The superpower nuclear standoff gave us fifty years of relative peace, we had cheap energy from inherent over-supply of oil, grain supply increased faster than population growth and the climate warmed due to the highest solar activity for 8,000 years. All those trends are now reversing. But it will get much worse than that. The next glaciation will wipe out many countries and nothing will stop that from happening. For example, the UK will end up looking like Lapland. As an indication of just how vicious it is going to get, consider that there are rocks on the beaches of Scotland that got blown over on ice from Norway across a frozen North Sea. As scientists, our task is to predict the onset of the next glaciation.

Onset of interglacials is driven by insolation at 65°N. That is where the landmass is that is either snow-covered all year round or not. It seems that insolation above 510 watts/sq metre will end a glacial period. For an interglacial period to end, the oceans have to lose heat content so that snows will linger through the summer and increase the Earth’s albedo. Thanks to the disposition of the continents, our current ice age might last tens of millions of years yet. From the Milankovitch data, this graph shows insolation at 65°N from 50,000 BC to 50,000 AD:

clip_image002

The green box has the Holocene ending at 3,000 AD – an arbitary choice. Insolation is already low enough to trigger glacial onset. For the last 8,000 years, the Earth has been cooling at 0.25°C per thousand years, so the oceans are losing heat. We just have to get to that trigger point at which snows linger through the northern summer. Solar Cycle 25 might be enough to set it off. By the end of this decade, we will be paying more attention to the Rutgers Global Snow Lab data.

From the source at: http://most-likely.blogspot.com/2012/03/milankovitch-cycles-and-glaciations.html

Model input is obliquity and precession and model output is the inverted δ¹⁸O record, with zero mean during the Pleistocene, from Lisiecki and Raymo 2004 and Huybers 2007. Lisiecki and Raymo use orbital tuning to constrain the age of the benthic records, while Huybers explicitly avoids this, consequently the two datasets are occasionally completely out of phase, but generally in good agreement, especially in the late Pleistocene.

As fitness function we take the product of the sum of squared errors (SSE) between the model and the two reference records from 2580 thousand years before present, with 1000 year timesteps.

For the longer term perspective, this is a combined crop (to make a continuous timeline) of the two fulls panel from the model prediction of the Milankovitch data.

clip_image004

The time period represented is from approximately 450,000 BC to 330,000 AD. The scale on the vertical axis is change in O18 content. There is a very good hind-cast match between the model and past temperature change as shown by the work of Lisiecki et al 2005 and Huybers 2007. The next glaciation is fully developed between 55,000 and 60,000 AD, with the next interglacial 20,000 years after that.

References

Huybers, P., 2007, Glacial variability over the last 2Ma: an extended depth-derived age model, continuous obliquity pacing, and the Pleistocene progression, Quaternary Science Reviews 26, 37-55.

Lisiecki, L. E., and M. E. Raymo, 2005, A Pliocene-Pleistocene stack of 57 globally distributed benthic d18O records Paleoceanography, 20, PA1003, doi:10.1029/2004PA001071.

Source Data: Download the consolidated data, including orbital parameters, insolation calculations, reference data and model output: Milankovitch.xlsx

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September 16, 2012 12:07 am

The next glaciation will wipe out many countries and nothing will stop that from happening.
Luckily, the slide into a glaciation is long and slow, tens of thousands of years, and, of course, the sun has nothing to do with it [Jupiter has].

richard telford
September 16, 2012 12:11 am

“there are rocks on the beaches of Scotland that got blown over from Norway across a frozen North Sea. As scientists, our task is to predict the onset of the next glaciation.”
But the first task is to stop making things up.

September 16, 2012 12:13 am

A good paper on Milankovitch’s theory: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf

davidq
September 16, 2012 12:18 am

Perhaps we need to widen and deepen the Panama canal. Didn’t the current onset of glaciation start occurring after the Atlantic and Pacific was cut off?
20 Miles wide, 300 feet deep. doable?

Mike Bromley the Kurd
September 16, 2012 12:22 am

With all our revulsion regarding models, it is difficult to say “OK, but this one refutes global warming”. Well, it might, but is it not still a model? And this ice age is how far into the future? No point in being alarmist at all, because the effects of continental glaciation are well known! It’s like running a big scraper across the world. Nothing will stop it.
The Climate alarmists, on the other hand, need to raise alarm to curry support for what is largely a speculative circumstance. They need to invent a bogeyman, and invent a solution, which, like kinetic energy, compounds at the square of its velocity! They can’t define the problem, so how on earth can they propose a solution?

Aussie Luke Warm
September 16, 2012 12:26 am

This article has spooked me. In fact, I’ve just put on my hawthorn reg grundies.. Can we do anything to avert returning to an ice age?

September 16, 2012 12:29 am

This post so apes the CAGW meme that I can’t help wondering if it was not written with tongue firmly in cheek Very much, “Back to the Seventies”.

sophocles
September 16, 2012 12:37 am

Hmm, I don’t think I’ll sell my wool shares just yet .

Christian_J.
September 16, 2012 12:38 am

This effort turns everything everyone has been told for the last thirty odd years, completely upside down. It puts paid to the increase in warming as those old studies have continually demonstrated, which will not happen and also introduces the fact that the Sun, remember the Sun, will have the last say after all. Meanwhile we pass the popcorn as the lunacy of the CAGW hysterics wanders on it’s already disturbing path. But this time, it’s all downhill.

tallbloke
September 16, 2012 12:39 am

Or, the 65N insolation may not drop low enough to cause glacial onset this time round and the Holocene may continue for another 50k years.
Nobody knows.

September 16, 2012 12:57 am

More likely those rocks were embedded in icebergs calved from Norwegian glaciers that got blown across the North Sea. BTW, they are called Drop Stones.

Warm
September 16, 2012 1:02 am

“For an interglacial period to end, the oceans have to lose heat content so that snows will linger through the summer and increase the Earth’s albedo”
I agree,
But… Where are the evidences that it is happenning ?
http://climate.rutgers.edu/snowcover/chart_anom.php?ui_set=1&ui_region=nhland&ui_month=6
http://climate.rutgers.edu/snowcover/chart_anom.php?ui_set=1&ui_region=nhland&ui_month=7

jim
September 16, 2012 1:06 am

OMG, Mann got his hockey stick up side down!
Thanks
JK

Chris in Canada
September 16, 2012 1:09 am

Just have to ask this:
Given the recent discussion about geo-engineering to combat the alleged AGW (parasol gases and the like):
How much human-generated CO2 would be required to counteract an ice age? If we have 1000 years to pump CO2 into the atmosphere, is it possible to maintain the interglacial indefinitely?
(This, of course, assumes that humanity won’t do itself in, in some other way, in the intervening thousand years.)

tango
September 16, 2012 1:23 am

Please would somebody tell the Australian prime minister J Gillard what’s around the corner she is hell bent on destroying us with the carbon tax

September 16, 2012 1:32 am

I guess i won’t be around to notice. Good news then. No more need to worry about our grandchildren’s earth and how we leave it. Bummer for the ecofanatics though.

Kev-in-Uk
September 16, 2012 1:33 am

Obviously, as a geologist, I find this easy to read – but for those who may find it difficult to comprehend, the net result is we don’t have to worry for a good few centuries yet!
In passing, I’m not keen on the use of the term ‘trigger’ for a glacial event – it implies a ‘non-reversible’ and ‘fixed’ point, kind of like the tipping point scenario that the warmista like to use for earths mean temp (which all geologists know is false!). Lots of factors have to come together, and remain together, for some considerable time for glacial onset to fully take hold (IMHO).
What I mean is that a glacial period could be presented/considered by ‘coolists’ to be initiated by the onset of several cold winters, but this would be a false premise – in the same way as ‘runaway’ thermal heating didn’t occur as per the ‘warmists’ arguments in the 90’s! Obviously. no one ‘knows’ for sure, but I can’t imagine the next glacial period being able to be defined without at least a few centuries of data?
An interesting piece, but to be fair, I think the timescale inferences have been perhaps lost to the general non-geological folk…just saying…

September 16, 2012 1:36 am

Here is a link to the Rutgers snow extent graphs.
http://climate.rutgers.edu/snowcover/chart_seasonal.php?ui_set=namgnld&ui_season=2
Note the increasing winter snow extent trend, particularly from around 2007. Also the steep decline in spring snow extent.
But perhaps the most interesting thing is the high year to year variability. Given the large albedo difference between snow and bare ground, it looks to me like natural variability plays a significant role in the start of the glacial phase.

Truthseeker
September 16, 2012 1:37 am

So, how long have we got before we are all screwed?

Gerry B
September 16, 2012 1:38 am

BRRRRRR!!

Andy, Epsom, Surrey, UK
September 16, 2012 1:46 am

Maybe it is time to have central heating installed (at last)

Atomic Hairdryer
September 16, 2012 2:05 am

Re Kev-in-Uk says: September 16, 2012 at 1:33 am

Obviously, as a geologist, I find this easy to read – but for those who may find it difficult to com8prehend, the net result is we don’t have to worry for a good few centuries yet!

Obviously as a concerned citizen, I think governments should be applying the precautionary principle and ACT NOW! Together, we can prevent glaciation. We can fight glaciation and the causes of glaciation. The developed western economies obviously have the most to lose, so I suggest a mere 1% of GDP is transferred to building the Atomic Hairdryer fleet. With suitable funding, we can blow that pesky ice back to the holocene optimum, all for a modest management fee.

Brian H
September 16, 2012 2:07 am

Andy;
What have you been using up till now, campfires in a recess in the wall?

Galvanize
September 16, 2012 2:10 am

“As an indication of just how vicious it is going to get, consider that there are rocks on the beaches of Scotland that got blown over from Norway across a frozen North Sea.”
Are you sure? Sorry, but this looks a bit like model based scare mongering to me.

kadaka (KD Knoebel)
September 16, 2012 2:18 am

Remember when the cemetery plot salesman is justifying their exorbitant prices by promising perpetual care, that “perpetual” will end once an advancing glacier covers over the graveyard, and your “eternal resting place” gets scraped and ground away to non-existence. Get the “dust to dust” over early and take the cremation.
Although if anyone here feels up to the marketing challenge, there are many abandoned mines available that are suitable for conversion to thousands of glacier-proof burial vaults.

anarchist hate machine
September 16, 2012 2:19 am

How much human generated CO2 would counteract an ice age? If we burned all of the remaining fossil fuels found in the earth we couldn’t create a greenhouse effect enough to offset the next glaciation.

kwik
September 16, 2012 2:22 am

davidq says:
September 16, 2012 at 12:18 am
“Perhaps we need to widen and deepen the Panama canal. Didn’t the current onset of glaciation start occurring after the Atlantic and Pacific was cut off?
20 Miles wide, 300 feet deep. doable?”
For modern man, it is doable. We can make huge “Canal Machines”. Just like the tunnel machines.
Just click “Play”…..or “Dig”. But 20 Miles ? Make it 100 Miles wide.

September 16, 2012 2:25 am

We can al move to central Siberia, that’s usually warmer than today during glacials,
https://dl.dropbox.com/u/22026080/Last%20Glacial%20Maximum%20in%20Siberia.pdf

September 16, 2012 2:25 am

It’s like running a big scraper across the world. Nothing will stop it.
Black carbon will. Well at least for a few hundred to a few thousand years.
Legally mandated inefficient coal and wood stoves, building the dirtiest coal fired power stations we can, prescribed setting of forest fires, legally mandated field burning of agricultural waste, make sure those peat fires in SE Asia burn every year.
It’s doable.

mwhite
September 16, 2012 2:39 am

“Earliest evidence for modern humans in Europe identified”
http://planetearth.nerc.ac.uk/news/story.aspx?id=1087
“researchers dated the jawbone to between 41,000 and 44,000 years old”
“The jawbone was first unearthed in 1927, but its significance wasn’t appreciated until now. ‘The site in Devon – Kent’s Cavern ”
With a much lower sea level Devon was a considerable distance from the sea. Things will change but we’ll survive.

Kelvin Vaughan
September 16, 2012 2:54 am

tango says:
September 16, 2012 at 1:23 am
Please would somebody tell the Australian prime minister J Gillard what’s around the corner she is hell bent on destroying us with the carbon tax
You wait til she introduces glaciation tax. It will be horrendous!

Kelvin Vaughan
September 16, 2012 3:00 am

Truthseeker says:
September 16, 2012 at 1:37 am
So, how long have we got before we are all screwed?
Usually around 80 years or so but with todays fast food diets and obesity it will probably fall to 50 years not too long from now.

aksam@op.pl
September 16, 2012 3:01 am

Glaciations take place when 65N is less insolated in springs and summers which causes snow not to melt. When snow is not melting most of solar radiation is reflected (instead of being absorbed by dark earth surface) so less energy is provided. Currently there is almost no snow at 65N in summers (despite the low insolation) so no glaciation can take place. And in the near future, because of Earth’s precession decade by decade 65N will be better and better insolated in sprigns and summers so glaciation will be less and less probable.

kadaka (KD Knoebel)
September 16, 2012 3:04 am

From Aussie Luke Warm on September 16, 2012 at 12:26 am:

Can we do anything to avert returning to an ice age?

Cover the Earth-facing side of the Moon with reflective foil. NASA says the visual geometric albedo is only .12, a third of Earth’s. It only looks so bright because it gets a lot of sunlight. So cover that side in foil and bounce that wasted energy onto the Earth, keep the tipping point away and the glaciation at bay.
Hey, we got people seriously considering fixing CAGW with a “solar shield” placed between us and the Sun. Investigating covering the Moon in foil should easily be worth a few million in research grants, and that’s just for the computer modeling.
And if we do have several centuries of lead time, it’d be pretty cheap to do, as in a few decades we’ll be able to drop onto the Moon some self-replicating solar-powered robots to process the lunar material and do the work. Then whomever’s here just has to sit back and wait for the job to get done…

Kelvin Vaughan
September 16, 2012 3:07 am

Building An Igloo
amazon.co.uk/Building An Igloo
Low Prices on Building An Igloo. Free UK Delivery on Amazon Orders

DaveF
September 16, 2012 3:12 am

kwik 2:22am:
“Make it 100 miles wide.”
I’m not sure that the Panamanians would be too keen on losing around a sixth of their country.

DirkH
September 16, 2012 3:22 am

In the description at “most likely”, I find no test for predictive skill of the optimized model. One would do that by optimizing the model on only a part of the past data and use the remainder of the past data for a validation. So, just as I tell the warmists, I have to tell this modeler: as long as I have not seen such a test, I won’t believe the model until I have seen it get something right that it was not trained on.

David Archibald
September 16, 2012 3:23 am

Philip Bradley says:
September 16, 2012 at 12:57 am
So much has been forgotten. Fred Hoyle’s book “Ice” has a good description of the Norwegian rocks out of place. Just think for a moment. For the rocks to be dropstones, sea level would have to have been higher than it is now.

Kev-in-Uk
September 16, 2012 3:27 am

Atomic Hairdryer says:
September 16, 2012 at 2:05 am
Good idea! do you need a PA? LOL

David Archibald
September 16, 2012 3:29 am

Chris in Canada says:
September 16, 2012 at 1:09 am
All the rocks we can dig up and burn will only get us to 600 ppm at best, good for only another 0.2 of a degree. Then the deep oceans will suck it all down.

Michael Schaefer
September 16, 2012 3:30 am

Well, normally, Tallbloke’s name in a posted comment appears with a direct link to his own Blog “Tallbloke’s Talkshop” – but not here:
tallbloke says:
September 16, 2012 at 12:39 am
Or, the 65N insolation may not drop low enough to cause glacial onset this time round and the Holocene may continue for another 50k years.
Nobody knows.
—————————————————————————————————————–
Also, the content of this comment makes me wonder, if we may perhaps have a Name Troll among us.
Tallbloke – was that really you?
[Not a Name Troll – IP and email is correct for Tallbloke ~mod]

ExWarmist
September 16, 2012 3:35 am

Very interesting if you happen to be alive during the transition…

ExWarmist
September 16, 2012 3:39 am

This is bullish for Australian real estate…

Ian W
September 16, 2012 3:43 am

Chris in Canada says:
September 16, 2012 at 1:09 am
Just have to ask this:
Given the recent discussion about geo-engineering to combat the alleged AGW (parasol gases and the like):
How much human-generated CO2 would be required to counteract an ice age? If we have 1000 years to pump CO2 into the atmosphere, is it possible to maintain the interglacial indefinitely?
(This, of course, assumes that humanity won’t do itself in, in some other way, in the intervening thousand years.)
anarchist hate machine says:
September 16, 2012 at 2:19 am
How much human generated CO2 would counteract an ice age? If we burned all of the remaining fossil fuels found in the earth we couldn’t create a greenhouse effect enough to offset the next glaciation.

Carbon dioxide has a minimal effect on atmospheric temperatures and what effect it might have is merely to slow the loss of heat. If the heat is not put there in the first place then sorry it will still get cold however many SUVs you drive chasing flatulent cattle.
From the paper by Gerard Bond – the ‘Bond Event’ drops into glacial temperatures can be rapid:
“As was the case for the glacial events, the Holocene shifts were abrupt, switching on and off within a century or two at least and probably faster, given the likely blurring of event boundaries by bioturbation”
http://rivernet.ncsu.edu/courselocker/PaleoClimate/Bond%20et%20al.,%201997%20Millenial%20Scale%20Holocene%20Change.pdf
So perhaps tell your grandchildren to move to live somewhere warm,

RexAlan
September 16, 2012 3:54 am

Sorry Kwik no can do!
Only picks and shovels allowed or the environmentalists will have a nanny fit.

steve
September 16, 2012 4:30 am

of course an ice age would be very easy to put off. just use the greenhouse gases that are 20,000 times as powerful as CO2 but don’t harm the ozone layer. a relatively small industry could do it. it’s probably how we will terraform mars.
http://en.wikipedia.org/wiki/Terraforming_of_Mars#Using_fluorine_compounds

Richard M
September 16, 2012 4:31 am

If, as it appears, all radiation available to CO2 is already absorbed, then adding more CO2 will do nothing. However, there are other GHGs like N2O that may do the trick. The problem would be to find something that can be easily scrubbed after the fact. Otherwise, it may get too warm after the snow/ice is melted.

William
September 16, 2012 4:35 am

Variations of insolation at 60N does not pace or cause the glacial/interglacial cycle.
The glacial/interglacial cycle and the cycle abrupt climate events are caused by the solar magnetic cycle restarting. I will as I have noted previously provide a detailed explanation with supporting papers of the entire mechanism if and when there is unequivocal observational evidence that the solar magnetic cycle has been interrupted as well the observational evidence of the expected earth anomalies.
The Milankovitch theory cannot explain abrupt climate change which is the cause of the glacial/interglacial cycle. The Milankovitch theory cannot explain why the glacial/interglacial cycle followed a 41 kyr cycle from roughly 3 million BP to roughly 800 kyr BP and then changed to a 100 kyr cycle. The Milankovitch theory cannot explain why the Southern Hemisphere abrupt cools when the Northern Hemisphere cools. (The seasonal variance in insolation is of course opposite in the Southern Hemisphere so the ice sheets should not expand as the summers are warmer and the winters cooler. i.e Opposite to the Northern Hemisphere.)
Interglacial periods end abruptly, rather than gradually and there is evidence of cycle “RICKIES” – Rapid Climate Change Events, through the interglacial period and the glacial period. The finding of RCCEs “RICKIES” has one of the big surprises of the Greenland Ice sheet core analysis. At first the researchers did not believe the data and a second Greenland Ice sheet core was drilled a location where there was no ice sheet movement for the entire core period.
This paper notes Milankovitch hypothesis cannot explain what is observed.
http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf
The Milankovitch hypothesis as formulated here does not explain the large rapid deglaciations that occurred at the end of some of the ice age cycles (i.e., the several large negative excursions in Figure 2): many studies point to the need to invoke internal dynamics of ice sheets as a mechanism for occasional rapid collapses if a threshold size is exceeded [e.g., Imbrie and Imbrie, 1980; Paillard, 2001] …. ….Nor do the results explain the mid-Pleistocene transition between an earlier interval characterized by 40 kyr durations of ice ages and a later interval with 80 kyr to 120 kyr durations: it has been suggested that this transition may have been due to changes in basal conditions under the ice sheet or perhaps chaotic ice sheet dynamics [Clark and Pollard, 1998; Huybers and Wunsch, 2005]
This paper discusses the cyclic abrupt climate change events that correlate with a solar change. There is smoking gun the sun is the serial abrupt climate changer – the question is how does the sun cause what is observed.
http://www.esd.ornl.gov/projects/qen/transit.html
Until a few decades ago it was generally thought that all large-scale global and regional climate changes occurred gradually over a timescale of many centuries or millennia, scarcely perceptible during a human lifetime. The tendency of climate to change relatively suddenly has been one of the most suprising outcomes of the study of earth history, specifically the last 150,000 years (e.g., Taylor et al., 1993). Some and possibly most large climate changes (involving, for example, a regional change in mean annual temperature of several degrees celsius) occurred at most on a timescale of a few centuries, sometimes decades, and perhaps even just a few years. The decadal-timescale transitions would presumably have been quite noticeable to humans living at such times, and may have created difficulties or oppor
The time span of the past few million years has been punctuated by many rapid climate transitions, most of them on time scales of centuries to decades or even less. The most detailed information is available for the Younger Dryas-to-Holocene stepwise change around 11,500 years ago, which seems to have occurred over a few decades. The speed of this change is probably representative of similar but less well-studied climate transitions during the last few hundred thousand years. These include sudden cold events (Heinrich events/stadials), warm events (Interstadials) and the beginning and ending of long warm phases, such as the Eemian interglacial. Detailed analysis of terrestrial and marine records of climate change will, however, be necessary before we can say confidently on what timescale these events occurred; they almost certainly did not take longer than a few centuries.
According to the marine records, the Eemian interglacial ended with a rapid cooling event about 110,000 years ago (e.g., Imbrie et al., 1984; Martinson et al., 1987), which also shows up in ice cores and pollen records from across Eurasia. From a relatively high resolution core in the North Atlantic. Adkins et al. (1997) suggested that the final cooling event took less than 400 years, and it might have been much more rapid.
The event at 8200 ka is the most striking sudden cooling event during the Holocene, giving widespread cool, dry conditions lasting perhaps 200 years before a rapid return to climates warmer and generally moister than the present. This event is clearly detectable in the Greenland ice cores, where the cooling seems to have been about half-way as severe as the Younger Dryas-to-Holocene difference (Alley et al., 1997; Mayewski et al., 1997). No detailed assessment of the speed of change involved seems to have been made within the literature (though it should be possible to make such assessments from the ice core record), but the short duration of these events at least suggests changes that took only a few decades or less to occur.
The Younger Dryas cold event at about 12,900-11,500 years ago seems to have had the general features of a Heinrich Event, and may in fact be regarded as the most recent of these (Severinghaus et al. 1998). The sudden onset and ending of the Younger Dryas has been studied in particular detail in the ice core and sediment records on land and in the sea (e.g., Bjoerck et al., 1996), and it might be representative of other Heinrich events.
The 41 kyr world: Milankovitch’s other unsolved mystery by Maureen E. Raymo et al.
http://rsai.geography.ohio-state.edu/courses/G820.01/WI05%20climate%20history/2002PA000791.pdf
[1] For most of the Northern Hemisphere Ice Ages, from approx. 3.0 to 0.8 m.y., global ice volume varied predominantly at the 41,000 year period of Earth’s orbital obliquity. However, summer (or summer caloric half year) insolation at high latitudes, which is widely believed to be the major influence on high-latitude climate and ice volume, is dominated by the 23,000 year precessional period. Thus the geologic record poses a challenge to our understanding of climate dynamics.
The solution to what causes abrupt climate change and the glacial/interglacial cycle is not the thermohaline conveyor.
http://www.sciencedaily.com/releases/2009/05/090513130942.htm
Cold Water Ocean Circulation Doesn’t Work As Expected
The familiar model of Atlantic ocean currents that shows a discrete “conveyor belt” of deep, cold water flowing southward from the Labrador Sea is probably all wet.
A 50-year-old model of ocean currents had shown this southbound subsurface flow of cold water forming a continuous loop with the familiar northbound flow of warm water on the surface, called the Gulf Stream.
“Everybody always thought this deep flow operated like a conveyor belt, but what we are saying is that concept doesn’t hold anymore,” said Duke oceanographer Susan Lozier. “So it’s going to be more difficult to measure these climate change signals in the deep ocean.”
http://www.americanscientist.org/issues/id.999,y.0,no.,content.true,page.1,css.print/issue.aspx
If you grow up in England, as I did, a few items of unquestioned wisdom are passed down to you from the preceding generation. Along with stories of a plucky island race with a glorious past and the benefits of drinking unbelievable quantities of milky tea, you will be told that England is blessed with its pleasant climate courtesy of the Gulf Stream, that huge current of warm water that flows northeast across the Atlantic from its source in the Gulf of Mexico. That the Gulf Stream is responsible for Europe’s mild winters is widely known and accepted, but, as I will show, it is nothing more than the earth-science equivalent of an urban legend.
But from what specialists have long known, I would expect that any slowdown in thermohaline circulation would have a noticeable but not catastrophic effect on climate. The temperature difference between Europe and Labrador should remain. Temperatures will not drop to ice-age levels, not even to the levels of the Little Ice Age, the relatively cold period that Europe suffered a few centuries ago. The North Atlantic will not freeze over, and English Channel ferries will not have to plow their way through sea ice. A slowdown in thermohaline circulation should bring on a cooling tendency of at most a few degrees across the North Atlantic …. When Battisti and I had finished our study of the influence of the Gulf Stream, we were left with a certain sense of deflation: Pretty much everything we had found could have been concluded on the basis of results that were already available
The following is an abbreviated list of paradoxes associated with Milankovitch’s theory.
http://en.wikipedia.org/wiki/Milankovitch_cycles
100,000-year problem
The 100,000-year problem is that the eccentricity variations have a significantly smaller impact on solar forcing than precession or obliquity and hence might be expected to produce the weakest effects. However, observations show that during the last 1 million years, the strongest climate signal is the 100,000-year cycle. In addition, despite the relatively great 100,000-year cycle, some have argued that the length of the climate record is insufficient to establish a statistically significant relationship between climate and eccentricity variations.[8] Some models can however reproduce the 100,000 year cycles as a result of non-linear interactions between small changes in the Earth’s orbit and internal oscillations of the climate system.[9][10]
400,000-year problem
The 400,000-year problem is that the eccentricity variations have a strong 400,000-year cycle. That cycle is only clearly present in climate records older than the last million years. If the 100ka variations are having such a strong effect, the 400ka variations might also be expected to be apparent. This is also known as the stage 11 problem, after the interglacial in marine isotopic stage 11 which would be unexpected if the 400,000-year cycle has an impact on climate. The relative absence of this periodicity in the marine isotopic record may be due, at least in part, to the response times of the climate system components involved—in particular, the carbon cycle.
Stage 5 problem
The stage 5 problem refers to the timing of the penultimate interglacial (in marine isotopic stage 5) which appears to have begun ten thousand years in advance of the solar forcing hypothesized to have been causing it. This is also referred to as the causality problem.
Effect exceeds cause
See also: Climate change feedback 420,000 years of ice core data from Vostok, Antarctica research station.
The effects of these variations are primarily believed to be due to variations in the intensity of solar radiation upon various parts of the globe. Observations show climate behavior is much more intense than the calculated variations. Various internal characteristics of climate systems are believed to be sensitive to the insolation changes, causing amplification (positive feedback) and damping responses (negative feedback).

Rob L
September 16, 2012 4:35 am

Fortunately we are more than capable of preventing the onset of an iceage, with seabed propellers to drive ocean heat circulation, balloons, space mirrors, fusion, fission, dust on icesheets. The most cost effective methods might only cost a couple of percent of global GDP.
What’s the bet that the trigger for onset of a glaciation is a suitable large volcanic event? Drop the earth’s temp by 1°C and wham!

September 16, 2012 4:44 am

<i.David Archibald says:
September 16, 2012 at 3:23 am
Philip Bradley says:
September 16, 2012 at 12:57 am
So much has been forgotten. Fred Hoyle’s book “Ice” has a good description of the Norwegian rocks out of place. Just think for a moment. For the rocks to be dropstones, sea level would have to have been higher than it is now.
If the rocks are well above sea level then they will have been transported by Norwegian glaciers that spread to Scotland during the last glacial maximum.
http://donsmaps.com/icemaps.html
A rock sliding across the frozen North Sea is completely implausible. Have you ever seen a frozen ocean? Its one ridge of ice after another. And a rock would be an albedo hotspot and would freeze into the ice after a couple of hours of sunshine.

September 16, 2012 4:48 am

Another point, both LR04 and Huybers07 are based on benthic stacks and both gaze at the bad correlation with the 65North insolation, for instance around 420 thousand years when we had the highest benthic isotope swing combined with the least variation in the insolation.
http://www.eoearth.org/article/Milankovitch_cycles
That should raise red flags.
In this thread, one can read how the Greenland isotopes are NOT a proxy for temperature, but for absolute humidity
http://www.physicsforums.com/showthread.php?p=4074335
Some comparisons there with fossil and paleobotanical records trash the temperature misunderstanding of the Younger Dryas.

Athelstan.
September 16, 2012 5:07 am

Who could dispute we’re on the down slope, certainly not me, it is a thought and often in my mind – above my head – there was, in the not too distant past – a couple of thousand feet of ice – awe inspiring thought.
What is not in dispute, is that the world is still in the grip of an ice age, there may be a blip – another little ice age coming but the big one is still some time away.
I’ve searched the York’s coast boulder clays, in it one can find all sorts of goodies; Shap granite [from the lakes], is fairly common and schists, gabbro, dolerites, basalt too and fossils aplenty some from the limestone of the Pennines – all left there by the ice and all from far flung parts.
Another thing not in dispute, mankind’s puny surface scrapings and input of a minor but nevertheless vital trace gas are neither here nor there.

Alberta Slim
September 16, 2012 5:18 am

I say that we contact “Jimmy-boy” Hansen, and tell him he was right all along about the coming “ice-age” . [from his ’70s claim], and get him back onto the “global cooling” bandwagon.
That way we get rid of a warmist, and show the public that the warmists don’t know what to believe.

Bill Illis
September 16, 2012 5:20 am

You have to go back to the start of the glacial cycles to see how low 65N solar insolation values have to get in order to trigger the start of the ice ages. You have to go back to 115,000 years ago to see the last one.
After the large initial drop, it takes two or three good upswings to break the back/decrease the volume of the ice-sheets enough to eventually melt out the ice in the next upswing. Once the volume builds up to a km or so high, one upswing is not enough to completely melt out the ice before another (smaller this time) downswing occurs. It takes two or three or four upswings.
The next downturn of sufficient size to put us into an ice age is 50,000 years out (and perhaps 130,000 years out). The numbers are almost at their low point right now and it only declines very marginally for a few thoudand years in the future, not low enough to stop summer melt on Ellesmere Island for example.
Technically, the solar insolation values can be accurately forecast out and back for up to 5 million years at a time before uncertainties become too great.

ExWarmist
September 16, 2012 5:25 am

CO2 enrichment of the atmosphere will lessen the impact of the glacial period on that part of the planet not covered in ice. The biosphere will benefit overall and human survival will be enhanced due to greater plant/crop productivity.
Note that humans were bottle-necked down to approx 3000 individuals in the last glaciation and almost died out.

Rhys Jaggar
September 16, 2012 5:30 am

What would be more constructive than this scaremongering would be to work on where in the world, currently not devoted to producing the majority of the world’s food, would climate be suitable in an ice age, to produce the food which would no longer be producable in Canada, Northern Mid-West, Russia, Ukraine etc?
Is it Oklahoma, Arkansas, Tennessee, West Virginia? Is it the Northern Sahara? Is it the Middle East (the Arabian Deserts, Iraq, Iran etc)? Is it part of the Australian desert??
Perhaps the answer to this is: ‘we can’t predict it exactly, but the most likely places are these’.
What is clear is that the world will have the choice of starving people in the North to death or enabling a mass migration to more subtropical latitudes.
The effect of an ice age on human beings will be almost entirely determined by their values as a species.

stevefitzpatrick
September 16, 2012 5:36 am

Humm…
There is a very good chance Earth would contiune to follow cyclical glaciation, but descent into the next colder period will depend on net energy balance. While the very long term (10,000+ years) may bring glaciation, the current influence of GHG forcing makes a substantial delay jn that process likely. This is not speculation: the best estimate of ocean heat content is that there has been an increase (not decrease) over the past 50 years. Argo will contiune to collect heat data; your postulated loss of heat from the ocean would look more credible if the Argo data actually showed heat loss; it clearly does not.

Steve M. from TN
September 16, 2012 5:39 am

No matter what spin you want to put on it, the “normal” state for the past several hundred thousand years is COLD. We are in a nice comfortable warm period with a nice growing season in which we can feed the billions of people on the planet.

Scarface
September 16, 2012 5:41 am

Meanwhile, in the MSM…

Thanks, David, for perfectly destroying my peaceful and quiet sunday afternoon 🙂
Seriously, thanks for reminding us of some real-world climatology.
Warmth is not to be feared. It’s the cold that will destroy us in the end.

September 16, 2012 5:43 am

A full Ice Age is not required to hurt the developed world. More moderate global cooling could suffice.
Modern Western society is complex, so moderate global cooling, together with a crippling of our food and energy systems through green-energy nonsense, could have devastating effects. (Add a collapse of major global currencies due to excessive money-printing by central banks in the UK, Europe, the USA and Japan.)
We predicted global cooling by 2020-2030 in an article written in 2002. I think there is a reasonable probability that this cooling will be severe enough to affect the grain harvest. Urgent study of this question is appropriate, but the climate science community is so contaminated by warmist hysteria that it is apparently incapable of objective analysis.
Is this just more alarmist nonsense? Perhaps, but we have a strong predictive track record, unlike the warmists who have none.
__________________
Here are some background notes:
http://wattsupwiththat.com/2012/08/23/ar5-climate-forecasts-what-to-believe/#comment-1064602
[excerpts]
Prediction Number 9
In a separate article in the Calgary Herald, also published in 2002, I (we) predicted imminent global cooling, starting by 2020 to 2030. This prediction is still looking good, since there has been no net global warming for about a decade, and solar activity has crashed. If this cooling proves to be severe, humanity will be woefully unprepared and starvation could result. This possibility (probability) concerns me.
8 Successful Predictions from 2002 (these all happened in those European countries that fully embraced global warming mania):
See article at
http://www.apegga.org/Members/Publications/peggs/WEB11_02/kyoto_pt.htm
Kyoto has many fatal flaws, any one of which should cause this treaty to be scrapped.
1. Climate science does not support the theory of catastrophic human-made global warming – the alleged warming crisis does not exist.
2. Kyoto focuses primarily on reducing CO2, a relatively harmless gas, and does nothing to control real air pollution like NOx, SO2, and particulates, or serious pollutants in water and soil.
3. Kyoto wastes enormous resources that are urgently needed to solve real environmental and social problems that exist today. For example, the money spent on Kyoto in one year would provide clean drinking water and sanitation for all the people of the developing world in perpetuity.
4. Kyoto will destroy hundreds of thousands of jobs and damage the Canadian economy – the U.S., Canada’s biggest trading partner, will not ratify Kyoto, and developing countries are exempt.
5. Kyoto will actually hurt the global environment – it will cause energy-intensive industries to move to exempted developing countries that do not control even the worst forms of pollution.
6. Kyoto’s CO2 credit trading scheme punishes the most energy efficient countries and rewards the most wasteful. Due to the strange rules of Kyoto, Canada will pay the former Soviet Union billions of dollars per year for CO2 credits.
7. Kyoto will be ineffective – even assuming the overstated pro-Kyoto science is correct, Kyoto will reduce projected warming insignificantly, and it would take as many as 40 such treaties to stop alleged global warming.
8. The ultimate agenda of pro-Kyoto advocates is to eliminate fossil fuels, but this would result in a catastrophic shortfall in global energy supply – the wasteful, inefficient energy solutions proposed by Kyoto advocates simply cannot replace fossil fuels.
[end of excerpts]
______

standbythree
September 16, 2012 5:50 am

“…there are rocks on the beaches of Scotland that got blown over from Norway across a frozen North Sea.”
Another geologist here. It is true that Norwegian rock made it to Scotland in the last glaciation – but they were carried in ice flows, not blown by the wind. The North Sea was indeed frozen over though.
Reference:
“The ‘Pliocene’ gravels of Buchan: a reappraisal”
Scottish Journal of Geology, October 1981, v. 17:185-203

Steve
September 16, 2012 6:14 am

It takes a warm ocean for a glaciation. You need the increased snowfall to last year round. Dry cold will not raise the Albedo.

September 16, 2012 6:17 am

DaveF says:
September 16, 2012 at 3:12 am
kwik 2:22am:
“Make it 100 miles wide.”
I’m not sure that the Panamanians would be too keen on losing around a sixth of their country
===========================================================================
They won’t lose any ground, it will just be piled higher !!

tallbloke
September 16, 2012 6:25 am

Michael Schaefer says:
September 16, 2012 at 3:30 am
Well, normally, Tallbloke’s name in a posted comment appears with a direct link to his own Blog “Tallbloke’s Talkshop” – but not here:
tallbloke says:
September 16, 2012 at 12:39 am
Or, the 65N insolation may not drop low enough to cause glacial onset this time round and the Holocene may continue for another 50k years.
Nobody knows.
—————————————————————————————————————–
Also, the content of this comment makes me wonder, if we may perhaps have a Name Troll among us.
Tallbloke – was that really you?
[Not a Name Troll – IP and email is correct for Tallbloke ~mod]

It was me alright. I find David’s posts interesting if a little overconfident.
Ice ages end eventually. We don’t know whether the one we’re in ends with our Holocene interglacial or a different interglacial further into the future.
If you want more detailed thoughts from the talkshop, google milankovitch on a site specific search. I don’t want to develop a reputation as a spammer here.

Julian Williams in Wales
September 16, 2012 6:28 am

Makes cheerful Sunday reading

September 16, 2012 6:36 am

Mr. Archibald is correct. My own layman’s prediction is the slide into the next glacial will take two to 200 decades to be accepted by even the commoners. There is NOTHING we can do about it. If we can figure out how to control plate tectonics and push the continents to favorable positions, then probably. Regardless, I’m not holding my breath. I think Harold Ambler is worth mentioning: http://talkingabouttheweather.com/ and http://www.amazon.com/Dont-Sell-Your-Coat-Surprising/dp/0615569048/ref=sr_1_1?ie=UTF8&qid=1347802425&sr=8-1&keywords=dont+sell+your+coat
Anyway, it will take centuries after it is ovious. Still, it will reduce the human population by double digit percentages. Cold kills. Warmer is better.

Mickey Reno
September 16, 2012 6:38 am

I’ve just bought Bahama Bank underwater property futures. I’m going to be RICH. A-HA-HA-HA…. wait, when did you say this was going to happen?

Tom G(ologist)
September 16, 2012 6:40 am

Ho-hum. Except for some geologists intersted in making a name for themselves in stratigraphic nomenclature circles this is a big non-issue. Those aspiring geologists have been trying to establish a new geologic epoch- the Anthropocene – (see my blog post on this one at http://suspectterrane.blogspot.com/2011/10/anthrop-obscene.html)
But they are really just a sub-set of the same breed of geologist who named the Holocene in the first place. Geologically, the Holocene interglacial is NOT an epoch in the same way that the Pleistocene or Paleocene or Oligocene are. The Pleistocene was/is the epoch of the glacial and interglacial stages, characterized by periods of glacial maxima, punctuated by interglacial stages in which alpine gladiers alblated and the continental ice sheets retreated to Antarctica and Greenland. Which, of course, is the situation we have now. As long as we have conditions indicative of the Pleistocene we should never have counted ourselves out of the ice ages.

Mike Fowle
September 16, 2012 6:46 am

“Baby boomers like me have enjoyed the most benign period in human history. The superpower nuclear standoff gave us fifty years of relative peace”
Factually correct, but it didn’t feel that great at the time with the ever present threat of nuclear annihilation.

Billy Liar
September 16, 2012 6:57 am

Philip Bradley says:
September 16, 2012 at 2:25 am
Black carbon will. Well at least for a few hundred to a few thousand years.
You obviously don’t ski in the Alps. Man’s pathetic attempts with particulate carbon are utterly dwarfed by the amount of Saharan dust that lands all over the Alps. On many occasions, there’s enough of it visible on the surface to make the snow look pinkish or yellowish. Woe betide you if you try to ski on the heavier accumulations of dust, your skis will come to an abrupt stop.
In summer in the Alps most of the glacial firn areas will have a pinkish tinge if there has been significant melting going on.

tallbloke
September 16, 2012 6:57 am

I’ll just add that it’s worth noting that 65N insolation didn’t drop as far as at the end of the last half dozen or so interglacials, we’re already past the low point, and the Holocene is already longer than several past interglacials. Also, 65N insolation is not the only important factor. Eccentricity times well with the periodicity of glacial interglacial cycles.
We might be in luck. I hope so, even if it means we just keep getting warmer and the AGW theorists carry on holding sway with their mumbo jumbo. I’d rather put up with bad science than the onset of a glacial.
Hopefully, the shorter term multidecadal drop in T both David and I (and many others) expect from around 2014 onwards will put paid to the AGW meme forever anyway, once nature has performed the crucial experiment for us.

September 16, 2012 7:05 am

Stop the Next Glaciation Project – SNGP
North hemisphere where majority of the land mass and the world population is concentrated has plenty of time to do a bit geo-engineering which should prevent the next glaciation.
The idea presented here is simple, easily implemented with available technology and in gradual stages as required.
http://www.vukcevic.talktalk.net/SNGP.htm
You heard it here first !
Views of civil engineers and geologist may corroborate feasibility of the suggested project.

Leonard Weinstein
September 16, 2012 7:05 am

Philip Bradley had it almost correct. Black carbon is relatively easy to use, but the most effective way is to dust the ground (possibly from large lighter than air airships) with powered coal, or any other dark material (even volcanic ash), rather than depending on natural air born deposition of burn products. Ground or air vehicles could easily cover vast areas well enough to melt accumulations early during local summers. Northern North America and Northern Eurasia would be the main targets.

Fred from Canuckustan.
September 16, 2012 7:11 am

“More likely those rocks were embedded in icebergs calved from Norwegian glaciers that got blown across the North Sea. BTW, they are called Drop Stones”
When they grow up from little stones to big rocks they are called Eratics.
New York’s Central Park is littered with them.
Canada should either claim them as sovereign territory or demand those greedy Yankees give them back.

davidmhoffer
September 16, 2012 7:13 am

Chris in Canada;
How much human-generated CO2 would be required to counteract an ice age? If we have 1000 years to pump CO2 into the atmosphere, is it possible to maintain the interglacial indefinitely?
>>>>>>>>>>>>>>>>>>>
That’s one of those questions which, if you ask on a warmist blog, goes POOF! and disappears. ‘Cuz they’d rather not admit that CO2 is logarithmic, meaning it is subject to the law of diminishing returns. The accepted meme is that doubling of CO2 = +3.7 w/m2 = +1 degree. Let’s look at that starting with our current CO2 concentration of close to 400 ppm.
PART 1
400 x 2 = 800 = 1 degree
800 x 2 = 1600 = 2 degrees
1600 x 2 = 3200 = 3 degrees.
So, if we quadruple our entire consumption of CO2 starting today, it will take about 800 years to get us an extra 3 degrees.
From 1920 to now, CO2 concentrations have increase from about 280 to about 400. At that rate it will take only 2,800 years or so to get us an extra 3 degrees. Of course the warmists will point out that our CURRENT rate of increase is about double what it was in 1920. So at current rates, it will take 1,400 years to get another 3 degrees. And that’s assuming that feedbacks are not negative, an assumption that the science (in my opinion) is increasingly showing to be incorrect.
I’m not particularly worried however. What is remarkable about human beings is our ability to confront the challenges of nature and defeat them. An ice age won’t happen in an instant, we’ll have centuries to both adapt to it and mitigate it. The only way an impending ice age defeats the collective ingenuity of the human race is if we lay down and die.

Peter Miller
September 16, 2012 7:17 am

“As an indication of just how vicious it is going to get, consider that there are rocks on the beaches of Scotland that got blown over from Norway across a frozen North Sea.”
This statement makes the article seem like a warmist spoof. These rocks were obviously brought by the glaciers during the last Ice Age.
We shall obviously return to another Ice Age sometime over the next 10,000 years, just exactly when is something which nobody knows.

September 16, 2012 7:25 am

The Milankovitch Theory was given a big boost when it was shown by Gerald Roe in a published science paper be well established.The charts in the below link is quite revealing.
In defense of Milankovitch
http://earthweb.ess.washington.edu/roe/Publications/MilanDefense_GRL.pdf

Schitzree
September 16, 2012 7:32 am

I’m so glad we have Cook and Lew-boy to tell us that skeptics are never skeptical of any theory except Global Warming, otherwise I might have gotten the idea that this article was being met with some skepticism.

September 16, 2012 7:36 am

Here is a link to John Kehr who published a good book about the climate and what it portends in the future and I have the book in my possession and believe that it should be considered for reading because he has a good case about the CO2 conjecture being irrelevant because it promote so little warm forcing that it is not a big deal for us.
http://theinconvenientskeptic.com/the-book/
Go to bottom the page and click on Chapters 8-10 and see what the series of charts show that we are already in Climate Autumn.Charts #3-5 shows a clear cooling trend that is in step with a NEGATIVE insolation trend at 65 degrees N.
Climate Winter is not far off into the future.

Bill Yarber
September 16, 2012 7:39 am

Kevin-in-UK
Don’t we already have 8,000 years of data (Holocene) and much, much more? We know that the current Ice Age began about 3m years ago and glaciations have occurred approx every 100,000 years, with brief (10-14k years) interglacials in between.
I don’t pretend to be able to predict the obvious onset of the next glaciation, but under today’s ocean circulation conditions and orbital dynamics, we are 1,000+ times more likely to be in a glaciation period within 3-5,000 years than to have runaway global warming.
At my age, and my children’s ages, I doubt any of my immediate family will see either potential outcome.
Bill

RobW
September 16, 2012 7:44 am

I call first dibs on a Snow Tax. It is simple. If you let snow fall in your country, you pay a tax to….

September 16, 2012 7:59 am

Interestingly enough I was just re-reading this last night:
http://westinstenv.org/wp-content/ANURGENTSIGNALFORTHECOMINGICEAGE.pdf

RobertInAz
September 16, 2012 8:00 am

Thanks for the excellent article especially the clean summary graph showing the cycle. I would love we are here indicator in the first graph.
I did struggle with this sentence: “…That is where the landmass is that is either snow-covered all year round or not….” I have always wondered why insolation is usually given at 65 North.
I guess 510 watts/m**2 refers to the daily average insolation at top of the atmosphere on the day of the summer solstice, at 65 N latitude (from Wikipedia – Insolation).

Alvin
September 16, 2012 8:00 am

I am not falling for the warmists that pose the question “How much CO2 needs burned to stop the cooling” as it’s a red herring.
It’s akin to Spinal Tap turning their amps up to “11”

Leo Morgan
September 16, 2012 8:16 am

Apropos of the post, I remind myself that if I am not as skeptical about claims that support my beliefs as I am about those that oppose them, then I’m not a true skeptic; I’m merely an intellectual whore.
The data linked to by ‘warm’ et al. certainly seem to discredit the post’s thesis for the time being.
That said, Milankovitch’s theories have been triumphantly validated by Geologists.
The failure of the warmist’s initial attempts at temperature hindcasting to incorporate the established findings of Geological Science relating to the Medieval Climactic Optimum, and the Little Ice Age is a major component of my skepticism about their competance to forecast the future.
However, there seems to be a surprisingly vast array of estimates as to when we will enter the downphase of any one of his cycles. I would appreciate anybody who is more knowledgeable than I taking the time to post an explanation of those discrepancies.

Gary Pearse
September 16, 2012 8:22 am

“Drop Stones” from Norway would be rafted over to Scotland in sea ice after the glacial period was over, the ice breaks up, sea level rises and the thick ice collects over parts of submerged present day Scotland, melts and drops. David, remember many of your readers are going to think you mean actually blown over from Norway in a downpour of rocks.

highflight56433
September 16, 2012 8:25 am

I recall some work done on the low temperature trends in the US by region. That trend is negative. There might be a gradual increase in snow cover in mountain or higher terrain that increasingly lingers. Not that last winter in Alaska and Bering Sea ice are anything as a singular event, but in the total global picture of early winter snows and lingering spring snow cover, the extended snow cover does increase the reflection of solar radiation. Would it not that in concert with a decrease in solar output be an indication of longer winters and drier climates?

September 16, 2012 8:25 am

In reply to William McClenney http://wattsupwiththat.com/2012/09/16/onset-of-the-next-glaciation/#comment-1079830
I have posted your PDF link in my growing list of presentations in my White Earth forum section:
http://www.globalwarmingskeptics.info/forum-55.html
Always wanting more to add there.
Thank you for that link!

Ray
September 16, 2012 8:25 am

I am glad I won’t be there for the next warm peak… some future generation of warmists will “disappear” the present peak for sure and will say that it is unprecedented.

September 16, 2012 8:30 am

Nigel Calder suggests that a little history of glaciation science may be appropriate here:
http://calderup.wordpress.com/2010/05/14/next-ice-age/#more-782
http://calderup.wordpress.com/2010/07/10/milankovitch-back-to-1974/

Fernando (in Brazil)
September 16, 2012 8:56 am

And now… again…. after being banned along with solar barycentric theory,
Jupiter: The Return
confusing times
http://www.argonavis.com.br/astronomia/servlet/orbitas.svg

September 16, 2012 8:57 am

Very interesting and much food for long term thought. That said, I am taken back in time back to the 1970’s when all the models showed cold was bold. Then again to a later time when models showed heat was neat and CO2 was the key. We must all remember two things. This kind of long term anything based on proxies and models is great cosmology or mythology. Remember to keep a skeptical eye and Mother Nature plays with loaded dice.

September 16, 2012 9:04 am

. Insolation is already low enough to trigger glacial onset.

Yeah, I think we are close. It looks to me as you go back into historical temperature reconstructions that each cool period for the past 3000 years has been a bit cooler than the one preceding it. The Little Ice Age was long and cold. The next Little Ice Age will be a bit less “little” and longer and cooler than the period we call the LIA. But I also note the same that Tallbloke mentions above. We are in a rather odd insolation cycle in that insolation is actually going to INCREASE a little bit from here and our orbital eccentricity is low so those are moderating factors.
But should we get things lined up just right … say a solar minimum, volcanic eruption, global patterns that result in colder than normal temperatures and that might be all that is required to overcome the hysteresis and tip us over into the “cold” stable state. That state is more stable than the “warm” stable state as we tend to stay there about 90% of the time and only briefly tip over into the “warm” state 10% of the time. I think all we need to tip the system is a summer with a greater than usual amount of summer arctic sea ice. I believe it is arctic sea ice or the lack thereof that tips us across the boundaries of those two states.

Rosy's dad
September 16, 2012 9:09 am

Great post! Good science fiction starts with facts and extends to the possible. The best part is that it’s all unprovable. I loved the commenters proposed solutions but don’t look forward to paying the hair dryer tax.

September 16, 2012 9:17 am

Reblogged this on The Next Grand Minimum and commented:
David Archibald offeres readers good advice on where we should focus our attention, on vanishing sunspots and year to year snow accumulation.

meemoe_uk
September 16, 2012 9:23 am

>the sun has nothing to do with it [Jupiter has].
OK Leif, I wasn’t expecting that from u. So how does Jupiter control Earth’s slide into ice ages?

September 16, 2012 9:31 am

Scarface [September 16, 2012 at 5:41 am] says:
“Meanwhile, in the MSM…”

ROTFLMFA!
Anyone know the story behind that video? Is it a group of warmies thinking this actually helps their idiotic cause or yet another great parody by normal people illustrating absurdity by being absurd?
I clicked through some if their links to figure this out and still can’t get a handle on it.

September 16, 2012 9:32 am

Scientist in question is Milutin Milankovic
http://www.egu.eu/egs/milankovic.htm
(posted by Milivoje Vukcevic)

September 16, 2012 9:33 am

Scientist in question is Milutin Milankovic
http://www.egu.eu/egs/milankovic.htm
(posted by Milivoje Vukcevic)

September 16, 2012 9:38 am

“The onset of the next glaciation is driven by the isolation at 65N.”
Since that is wrong, every thing that follows is wrong.
http://i122.photobucket.com/albums/o252/captdallas2/climate%20stuff/internalthermaloscillations.png
The center of the Earth’s thermal mass is just south of the equator thanks to the distribution of the land masses and current orientation of the axis of rotation. 65N is a red herring, pretty much like northern hemisphere warming is an indication of the degree of CO2 induced warming.
Notice the similar dampened tropical temperature curve and the dampened solar insolation curve in the post. Most of the “climate change” discussion is irrational because the “indicators” of change have nothing to do with the assumed causes of the changes. Until you better understand the internal dynamics of this system, you can’t properly assign cause and effect.
Kinda funny actually 🙂 In thermo, follow the energy is like follow the money in politics. Happy Sunday.

Kev-in-Uk
September 16, 2012 9:40 am

Bill Yarber says:
September 16, 2012 at 7:39 am
I agree – we can expect to come out of the current interglacial in the relatively near future – unless of course we have managed to reach the warmists runaway tipping point beforehand (/sarc!). But of course, this presumes the causal cyclical variation and periodicity continues as per expectation!
I still find it curious that excessive warming is declared after a few decades of slightly rising temps, in the same way as the so called ‘cooling’ was alarmingly declared in the 70’s – however, both deductions, when viewed on an appropriate scale, look more like insignificant ‘farts’ within the natural temperature variability range!! To then have the audacity to link some allegedly observed ‘little’ temperature rise to a trace gas (that has been at much much higher levels in the past), and extrapolate out to ‘catastrophe’ is really beyond any level of believability…..to a geologist anyway!

JA
September 16, 2012 9:41 am

Until scientists can explain with a hi degree of confidence what caused all the historic periods of cooling, warming, ice ages, etc., – and so far they cannot – then all is conjecture. More importantly, scientists have yet to explain how it is that the earth can move from a ball of ice to a very warm period, or vice-verse.
What mechanisms caused the earth to warm drastically from an ice age? How is it that during long periods of very warm climate the climate reverted back into an ice age?
Presently, scientists model stuff based on simplified models of the real world; well, this is what economists also do in their work, and their record in predicting anything is a PERFECT ZERO.
The earth’s climate has experienced every possible type of climate well before humans set foot on this earth, and scientists have no idea what caused all these changes.
There is some evidence that exogenous events have caused the changes (sun’s activity, cosmic rays, the earth’s orbital orientation, the position of our galaxy as it rotates, etc., etc).
No model seems to take account of all these variables.
Frankly, all these climate studies are junk science whose conclusions are mere guesses. If aerodynamicists designed aircraft the way climate scientists engage in their studies, there would be a dozen major airplane disasters every day.

September 16, 2012 9:45 am

meemoe_uk says:
September 16, 2012 at 9:23 am
“the sun has nothing to do with it [Jupiter has]. ”
OK Leif, I wasn’t expecting that from u. So how does Jupiter control Earth’s slide into ice ages?

Glaciations are caused by changes in the Earth’s orbit and axial tilt. Gravitational perturbations from [mostly] Jupiter slowly changes those parameters with well-known cycles [known several million years past and in future]. This is how. And has, of course, nothing to do with solar activity.

September 16, 2012 9:51 am

dallas says:
September 16, 2012 at 9:38 am
“The onset of the next glaciation is driven by the isolation at 65N.”
Since that is wrong, every thing that follows is wrong.

no, you are wrong. The evidence for orbital forcings is very strong: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf
See e.g. their Figure 3.

David Ross
September 16, 2012 9:56 am

Stones rolling across from Norway?
I don’t get the mode of traction.
Though I try and I try and I try and I try.
davidq wrote:

Perhaps we need to widen and deepen the Panama canal. Didn’t the current onset of glaciation start occurring after the Atlantic and Pacific was cut off?
20 Miles wide, 300 feet deep. doable?

Perhaps, but the greenies would hate it. It has been proposed to open up a sea-level canal by “nuclear excavation”.
Atlantic-Pacific InterOceanic Canal
http://archive.org/stream/interoceaniccana00unit/interoceaniccana00unit_djvu.txt
See also Operation Chariot
http://en.wikipedia.org/wiki/Operation_Chariot_(1958)
But I’m not sure of the need. It is just one glacial period we would want to avert not all of them. And there are probably other ways. Soot suits the bill.

Gilbert K. Arnold
September 16, 2012 10:15 am

@ Phillip Bradley (12:57): Phillip you are technically correct when you say those rocks in Scotland are called drop stones. However, to a geologist a drop stone is entirely different from a glacial erratic. Drop stone are typically found in deep water where the they have dropped off the bottom of an iceberg or ice sheet that is floating in deep water. The stones in Scotland are more properly glacial erratics in that they were transported on top of the ice sheet (usually due to a rock fall which dumped rocks on top of the glacier and they were deposited when they reached the terminus (aka snout) of the glacier or they were carried along the bottom of the glacier as it rode over the land surface.

September 16, 2012 10:16 am

Leif Svalgaard says on September 16, 2012 at 12:07 am:
“- – —- –.
Luckily, the slide into a glaciation is long and slow, tens of thousands of years, and, of course, the sun has nothing to do with it [Jupiter has].”
= = = = = = = = =
Are you quite sure that Jupiter is working quite independently and on it’s own? –
Is it not likely that there are possible Solar Cycles (SC) which we, at the moment, know didly sqat about” that influences things like planetary orbits and in fact everything else in the solar system?
Come to think of it; why do sunrays still shine through orifices in stonewalls etc. (Stonehenge is one example – and there are many others) the same way as they did when they were first built in ancient times if the axial tilt of the Earth fluctuates back and forth between 22 and 24.5 degrees every 41000 years – and the globe also does a “Gyroscopic wobble” or a complete circle around it’s axis every 23000 years – which should mean that since it is, presently, mid-summer in the Northern Hemisphere in June when that hemisphere tilts towards the Sun – 11500 years (half a wobble) ago it would have been mid winter in June. – Any evidence for that in ice cores etc.?

DirkH
September 16, 2012 10:17 am

Scarface says:
September 16, 2012 at 5:41 am
“Meanwhile, in the MSM…”
Mentally unstable. Probably SkS bloggers.

John West
September 16, 2012 10:21 am

Thankfully, by the time the next “ice age” starts to seriously affect our ability to feed the population of the planet, food production won’t be dependent on climate.
http://www.plantlab.nl/4.0/index.php/social-contribution/
http://www.omegagarden.com/
Assuming, of course, we have not stifled electricity production to the point where these kinds of solutions are impossible.

September 16, 2012 10:22 am

Hmmmm, – yes I know 11500 years ago there was a long winter coming to an end. But that is another story

Eugene WR Gallun
September 16, 2012 10:24 am

aksam@op.pl
sept 16 3;01am
party pooper

Paul Penrose
September 16, 2012 10:42 am

I’m not crazy about any of the models, this one included. But the data show that there has never been a time in the recent (last billion years or so) history of the earth that excessive heat caused extinction level events, no matter how much CO2 was in the atmosphere. However we know that there have been many ice ages, some lasting for millions of years. In fact, we are int the middle of one now and are just experiencing a short (in geological time frames) respite. The ice will return, that is not in doubt. The question is when and how much warning will we have? I don’t have much confidence in our ability to predict that right now, at least not in terms that are useful for human purposes. Saying it will happen sometime in the next 1-2K years is not helpful for making policy decisions. But I do know that doing anything that hampers our technological development (like hampering our energy supply) will be detrimental to our eventual survival, at least as a viable civilization. We will need every trick in the book if we are going to survive the coming ice. I just hope we don’t try anything drastic to stop it, because we could wind up making things much worse. I’m just hoping we will have hundreds of years to plan for it as some have suggested.

tallbloke
September 16, 2012 10:45 am

calderup says:
September 16, 2012 at 8:30 am
Nigel Calder suggests that a little history of glaciation science may be appropriate here:
http://calderup.wordpress.com/2010/05/14/next-ice-age/#more-782
http://calderup.wordpress.com/2010/07/10/milankovitch-back-to-1974/

Thanks Nigel. Probably the most important comment on the thread. Nice to see Kukla agrees with my assessment at
tallbloke says:
September 16, 2012 at 6:57 am
too

Eugene WR Gallun
September 16, 2012 10:57 am

This idea of widening the Panama Canal to prevent the next ice age just shows you the absolute silly ignorance of the people who post here on WUWT. THE PANAMA CANAL HAS LOCKS!!!!!!! Any fool knows you would need to dig a SEA LEVEL canal through Nicaragua!
Ignorance! Sheer Ignorance!!!!
Eugene WR Gallun

rgbatduke
September 16, 2012 11:00 am

But perhaps the most interesting thing is the high year to year variability. Given the large albedo difference between snow and bare ground, it looks to me like natural variability plays a significant role in the start of the glacial phase.
I agree. The Earth is clearly a system with a large “heat capacity” that exhibits considerable hysteresis and sufficient nonlinearity in the form of e.g. albedo and other feedbacks to sustain at least bistable behavior in the current glacial era. Bistable systems can, for certain values of the primary drivers (in the case of the Earth, at the very least net insolation but sadly there are many, many more and they themselves are highly nonlinear and possibly coupled and fed back independent of albedo or insolation per se) have two locally stable dynamic equilibrium states. The way the ice ages and interglacial eras should properly be viewed is on a timescale granularity of at least a thousand years if not longer, where long slow macroscopic (externally caused) changes in insolation associated with orbital resonances, precession, and possibly other unknown factors in the solar system or even the galaxy— not the Earth per se — create a cycle something like this: (starting arbitrarily with the Earth in a stable cold phase, since that is the most likely state in a glacial era):
* Macroscopic changes push the Earth from the single dynamically stable state it is in into a state which is truly bistable, where the sustained cold is due to local stability from feedbacks like albedo and possibly global circulation patterns and the presumably relatively low temperature/heat content of the oceans. CO_2 may or may not play an important role in this feedback — I rather think it does, but it is almost certainly not the dominant factor as it appears to follow rather than lead (also, see Ordovician/Silurian transition!).
* Macroscopic changes CAN — and at least sometimes, probably do — literally force the Earth out of glaciation by moving the climate system across the local stability boundary by force majeure, no fluctuations necessary. In this case the transition from stable cold to stable warm is directly driven and relatively rapid.
* At other times the macroscopic changes may simply alter things so that fluctuations gradually carry the climate from one state to the other through a random walk in a basically neutral environment. One expects a very different “spectrum” of fluctuations in the two cases — in the latter case one might see rapid warming followed by rapid cooling followed by rapid warming before (perhaps) stabilizing in one state or the other (usually in response to an ongoing but slow change towards full stability in the final state).
One way or another, then, we might well end up in the warmer interglacial phase of the glacial era, and initially it is quite likely that this warm phase is truly stable so that decadal or century scale noise (macroscopic or “microscopic”, the latter associated with phenomena or feedbacks in the Earth’s climate system itself) literally cannot cause transition back to a true cold phase. The end of the Wisconsin followed by the Younger Dryas fluctuation followed by the Holocene proper is a classic example of this sort of process — macroscopic drivers that first enabled, then mandated a warm phase transition out of the ice age to the point where even a global microscopic fluctuation like the YD could not stop the progression towards stable warmth.
* The macroscopic drivers continue to evolve, however, and they gradually return the Earth into first the truly bistable regime — where if we were glaciated we would remain glaciated but since we are warm we remain warm — and then to a point where fluctuations be damned, a driven transition to a stable cold phase occurs. Again the spectrum of the global temperature during the cold phase transitions would be expected to be quite different in the case where the macroscopic drivers quickly and directly force the transition compared to one where the changes are slow enough that fluctuations drive the process.
A glance at the thermal record of the Holocene suggests that the Earth is currently out in the bistable regime as far as macroscopic drivers are concerned. The paper above does nothing more than confirm this for at least one or two explicit models for those drivers. It also suggests that there could be time scales of decades to centuries before those drivers force the inexorable motion towards cold phase once again, but it quite literally cannot address the issue of fluctuation-driven transitions in the meantime because it does not provide much in the way of a MICROSCOPIC stability analysis or for that matter an analysis of macroscopic parameters with considerable variability outside of the model as well.
One of the most interesting of these is that of solar state. The Sun is apparently a rather variable star, with not only its regular 11/22 year Hale cycle variability but with considerable modulation of that variability on much longer and (as far as I know) not particularly well-understood timescales, timescales against which the entire period of observation with modern instrumentation are utterly insignificant. However, there are many other unknowns to consider — the progression of the Sun (and hence Earth) through an interstellar medium of variable density, “black swan” events that we simply haven’t been around looking with modern instrumentation long enough to observe (major CMEs such as the 1859 event or even one an order of magnitude longer and stronger), divergences between even the observable proxies of solar state (e.g. sunspots) and ones that would have been invisible e.g. solar magnetic state until very recently.
However, there is also noise due to volcanism — one good sized Tambora can ruin (or at least alter) global climate for years if not decades, global decadal circulation fluctuations, fluctuations in the “oceanic conveyor belt” (that may or may not have been responsible for the Younger Dryas), fluctuations in GHG levels outside of volcanism, and yeah, long term persistent changes due to human activity.
For example, one can consider
http://en.wikipedia.org/wiki/Desertification
Deserts are a prime example of a MICROSCOPIC bistable climate system that share many properties with the bistability described above. Plants tend to both cool the local climate and bind moisture. If there are enough plants growing on a major geographical tract of land with marginal rainfall (marginal to put it into the bistable regime) the plants cool and bind moisture sufficiently that positive feedback maintains the growing plants and the regime is locally stable in a non-desert state. However, once you introduce goats… they create the Sahara. Perhaps not singlehandedly, perhaps not all of it, but there is substantial evidence that the introduction of goats and farming culture caused the collapse of a fragile non-desert state in North Africa leading to the desertification of much of it, a process that continues measurably today as an exploding human population continues to push land at its boundaries across the stability boundary in between the desert/non-desert states.
This sort of anthropogenic climate change has been occurring for thousands of years, and has occurred at a vastly accelerated rate in the 20-21st centuries as modern medicine and relative affluence have caused populations to increase in already strained local ecosystems. It absolutely has an effect on “global warming” — indeed century scale desertification of a substantial fraction of marginal land is precisely the sort of microscopic fluctuation that might be expected to have potential global effects due to feedbacks known and unknown within the global climate system. Curiously, it isn’t AFAIK invoked as even a partial explanation of late 20th century warming, although one would think that the shift of as much as 10% of the Earth’s land surface area in the strict direction of desertification of previously wild and vegetation covered lands over that same time frame might have an important effect quite outside of CO_2 levels (and indeed, has an important effect ON CO_2 levels as well).
The last “interesting” piece of evidence is that the Little Ice Age, occurring in apparent coincidence with the Maunder Minimum, was the coldest period in the entire Holocene post the Younger Dryas fluctuation, and occurred as global temperatures had been gradually decreasing from the Holocene optimum for thousands of years. This large temperature excursion in response to what may have been a relatively minor variation in a primary driver (the Sun) strongly suggests that the Earth is either entering or is already solidly into the bistable regime where sufficiently sustained fluctuations can drive it nonlinearly towards the cold stable state, quite possibly drive it “rapidly” in that direction (where rapidly is still century long timescales — the LIA was simply not long enough and didn’t get enough e.g. albedo feedback going to affect a full transition).
Some climate scientists I communicate with think it likely that the increased CO_2 levels have already shifted the Earth into a state where at the very least fluctuation-induced transitions are no longer possible — the Earth is no longer bistable (if it was in the first place, which of course we do not know). The CAGW prediction, of course, is that the Earth is at least tristable and that we may have shifted it or be shifting it all the way back to an even warmer phase that hasn’t been observed for some 50 million years of geologic time (and that intuitively seems a bit unlikely to occur in an ice age, interglacial or not). I have some doubts of this, largely because of the Ordovician/Silurian transition, wherein the Earth entered an ice age, relatively rapidly, in spite of having seventeen times the atmospheric CO_2 content that it does now when it began, and in spite of sustaining it at ten times the current concentration for the entire period the ice age lasted.
This one event suggests that macroscopic (or microscopic?) drivers exist that at least can trump massively greater CO_2 concentrations than we currently have and force an ice age straight into the teeth of only greenhouse warming. Since we are already in a relatively brief interglacial of an ice age, at the probable end of that interglacial on the timescale of a few thousand years either way (likely already in bistable/unstable to the cold transition) the plausibility of a third-phase “catastrophe” seems significantly reduced. However, our ignorance is great. For all practical purposes, we have at most 33 to 50 years of “reliable” data on global climate based on modern instrumentation and knowledge, and sadly much of even that data has been corrupted by things like nuclear war and the extensive testing of nuclear bombs post World War II confounding efforts to normalize radioactive proxy scales and at the very least reducing the reliability of our knowledge of prior solar state based on strictly visible light observational records (e.g. sunspots).
Lief an others appear to be conducting a truly heroic effort to rescue the situation, but in statistical modeling I like to tell clients the simple truth that you cannot squeeze blood from a turnip or make reliable inferences with inadequate or corrupted data. It’s not magic, it is information theory, and true information degradation cannot be restored or interpolated by statistics-fu.
This same process is at work throughout climate science. The thermometric record — what should be the single most reliable measure of the state of the global climate across at least the century or two of reliable thermometric instrumentation at least approximately distributed around the globe — is manifestly profoundly corrupted by confounding phenomena from the UHI effect and desertification to systematic method errors in the way temperatures were sampled (on what is quite frankly a completely inadequate fraction of the Earth’s surface throughout most of that period). Once again the issue is simple information theory. One cannot restore the missing or corrupted information without making assumptions, and if one then uses the restored information as if it were data to arrive at new conclusions, those conclusions are inevitably contaminated by the assumptions made to the extent that they have no real predictive power.
It has been said by very reasonable scientists that it will take at least a century of observation with modern instrumentation to be able to get a firm (predictive) grip on the climate. It will take us a good chunk of that to just get a good handle on the Sun, decades more of observation to come to properly understand the ocean, decades more to live through at least a few permutations of global decadal oscillations. Even over the last 30 years, however, there has been a truly substantial divergence between the off-the-cuff prediction of Hansen and at least some CAGW enthusiasts, a divergence that is gradually restoring a measure of sanity to the scientific discussion.
Unfortunately, much of the political discussion remains extreme, both because “catastrophe sells” whether the product being sold is a politician seeking votes or a news medium seeking readers or watchers. Saying “there isn’t anything particularly interesting happening to the global climate, however variable the local weather is and always has been” just isn’t the sort of thing to attract votes or public attention. Even scientists are hardly immune to the lure of the extreme — the extreme makes it easier to get grants, attracts more fame and notoriety to published papers, solidifies prospects for tenure and life success. Who reads a paper that says “I performed a statistical analysis of a hypothesized increase in the violence and frequency in major tropical storms and found that they were if anything less violent and less frequent”? Even scientists might give a secret little sigh — the extreme is so much more appealing, making the temptation to discover extremity in boring, quotidian data far too great.
Nowhere is this temptation more clearly visible in climate science than in the infamous extrapolations of “Sea Level Rise” (SLR). SLR has been recorded — and extremely reliably recorded, compared even to the temperature — for at least a century, and there is an overlap on a multidecadal timescale with satellite observations to further validate the fixed sea gauge-based results from all over the world. The data clearly show a nearly constant rate of SLR of 2-3 mm/year over nearly the entire period.
Almost all of this rise is due to thermal expansion of the ocean water, not ice melt. The ocean itself is, in fact, one very, very large thermometer! The thermal expansion is directly related to the increase of the enthalpy content of the ocean water as the Earth has re-warmed from the LIA and Dalton coldward fluctuations (whatever their proximate macroscopic/microscopic causes). It suggests a smoothly averaged steadily increasing global temperature that is utterly divorced from CO_2 as a proximate cause. It is also highly extrapolable. At 3 mm/year, a full century of continuation is a solid 30 cm of SLR, period. There is no statistically significant acceleration visible in the entire record, and the linear trend significantly predates the era where anthropogenic CO_2 might have contributed to it:
http://en.wikipedia.org/wiki/File:Trends_in_global_average_absolute_sea_level,_1870-2008_%28US_EPA%29.png
Yet state governments such as that of NC are being urged to plan for and spend money like water subject to the assumption of well over one meter of SLR over less than 90 years! The public is being warned of dramatic surges, flooding real estate, doom and destruction! Science papers, with carefully cherrypicked end points, seek to scry some sort of disaster from some small section of the 140 year long record, even though a glance suffices to reveal that global sea level has risen almost exactly nine inches over the last 140 years.
Surely there is enough time to discern any such intense and dramatic acceleration in SLR rate and act on a decadal time scale, in plenty of time to avert any real or imagined disaster. But the actual 140 year record is not interesting enough, and does not sell newspapers or air time on the television. It does not attract the votes of either eco-nuts or mere ordinary citizens who have a perfectly normal concern about their environment (or oceanfront real estate). It does not make anyone’s research career to report that SLR is behaving the way it was when Teddy Roosevelt was riding over San Juan Hill, back when the sun never set on the British Empire, and most importantly, back when the global population of humans was roughly one seventh what it is today, and almost entirely non-industrialized by modern standards, with no cars or airplanes and only a few countries and continents even linked by rail.
Nature has plenty of room for disasters. We could at any moment be hit by a gamma ray burst that sterilizes the entire planetary surface. An asteroid could fall and produce a real climate change catastrophe. A pandemic could start that wipes out six out of seven living people in five years. Yellowstone could erupt as a supervolcano, provoking environmental changes that wipe out half of the human race and a million species over a few years. And yes, we could still have a nuclear or nuclear/biological war that decimates the human race and alters the planet in profound ways. Several of these — the pandemic, in particular — are far more plausible than the CAGW scenario. Others are plausible (but unlikely) and if they happen there is damn-all we can do about them.
It is a shame that people spend — or rather waste — quite so much time and energy and money on the prospects of unlikely disasters, so much more so when there are so many far more constructive uses to which all three could be put to the betterment of both the human race and for that matter the environment.
Replanting the deserts, for example
rgb

george e. smith
September 16, 2012 11:06 am

David,
I’m always impressed when I see apparently quite random but continuous curves of finite length, being fitted to some “model” computation.
Of course, given enough parameters, this is always theoretically possible, to some level of fit.
Your curve doesn’t look like it is too serious a fit problem, but I am impressed with some of the high frequency stuff that also seems to be modelled.
So then that begs the question: How much of this modelling exercise is based on, and calculated from real Physics (and maybe other science disciplines), rather than simply a brazen mathematical exercise on some data stream.
And I plan to stick around to see if your prediction; excuse me, that’s projection, comes true.
I think I’ll go back to New Zealand, to watch; just you try to get me there with your ice. You’re welcome to join us of course, but the place is a bit shaky; and is known to blow up from time to time; but I’m prtetty sure we have the ice problem licked.
George

Kelvin Vaughan
September 16, 2012 11:13 am

Leif Svalgaard says:
September 16, 2012 at 9:51 am
dallas says:
September 16, 2012 at 9:38 am
“The onset of the next glaciation is driven by the isolation at 65N.”
Since that is wrong, every thing that follows is wrong.
no, you are wrong. The evidence for orbital forcings is very strong: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf
See e.g. their Figure 3.
The next Ice Age will not determine who is right but who is left!

george e. smith
September 16, 2012 11:28 am

“””””…..Leif Svalgaard says:
September 16, 2012 at 9:51 am
dallas says:
September 16, 2012 at 9:38 am
“The onset of the next glaciation is driven by the isolation at 65N.”
Since that is wrong, every thing that follows is wrong.
no, you are wrong. The evidence for orbital forcings is very strong: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf
See e.g. their Figure 3……”””””
So Dr Svalgaard, before I read your reference (which I will), it occurs to me, that Dr Archibald’s assertion (that 65N insolation drives interglacial onsets), is not at all inconsistent, with your suggestion that orbital changes are the key.
That’s like saying that brake failure is what causes auto fatalities, in response to a statement that crashing into trees is the cause of auto deaths.
While orbital change may be (and likely is) the system change that controls ice ages; that really is just the change that results in 65 N insolation eventually reaching a level that tips the see-saw enough.
Having Enola Gay fly over Hiroshima, certainly led to the destruction of the city; but that didn’t actually occur, until a certain bomb detonated.

DaveF
September 16, 2012 11:38 am

Matthew W 6:17:
“They won’t lose any ground, it’ll just be piled higher!!”
Now that’s the difference between me and you educated blokes – I wouldn’t have thought of that 🙂

LazyTeenager
September 16, 2012 11:39 am

There is a contradiction here.
One graph says the ice is back in 3000 years. The other graph says its back in 10-15 thousand years.
The latter was my understanding so personally I am not worrying about glaciers in the near term of the existence of western civilization.

Justthinkin
September 16, 2012 11:41 am

ExWarmist says:
September 16, 2012 at 5:25 am.
Note that humans were bottle-necked down to approx 3000 individuals in the last glaciation and almost died out.
Interesting.Got a link for that ,please.
And as for glaciation,no need to panic.We Canucks get it every year,but glorious AGW fights it off for us. :):)
And of course,any scientist worth more than a plugged nickel knows warm is good,cold is bad.

September 16, 2012 11:42 am

O H Dahlsveen says:
September 16, 2012 at 10:16 am
Are you quite sure that Jupiter is working quite independently and on it’s own? –
No [I said ‘mostly’ Jupiter]. There are also smaller contributions from Saturn and smaller yet from the other planets. But the evidence for orbital forcings is very strong: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf See e.g. their Figure 3.
The insulation calculated from the known perturbations are almost a perfect match to the observed changes in ice volume changes, so the is little or no room [and no need] for any other causes.

September 16, 2012 11:48 am

george e. smith says:
September 16, 2012 at 11:28 am
So Dr Svalgaard, before I read your reference (which I will),
Please do before commented too much
it occurs to me, that Dr Archibald’s assertion (that 65N insolation drives interglacial onsets),
This is not Archibald’s assertion, but that of Milankovitch, Koeppen, and Wegner back in the 1940s. And most of Archibald’s article is borderline wrong. E.g. if you look at his first Figure it should be evident that temperatures the next 30,000 years are heading up, not down.

September 16, 2012 11:50 am

“Winter is coming”
Sorry for the interruption, but someone had to say it. Carry on with the scientific discussion.

September 16, 2012 11:51 am

Leif said, “no, you are wrong” I don’t think so or I wouldn’t have said it 🙂
Frankly, 45S to 65S would be the latitudes to watch most closely for glaciation. It wouldn’t take much of a reduction in solar forcing to increase the Antarctic sea ice which would reduce the efficiency of the circumpolar current. From there, all hell would break loss at both poles, but the tropical oceans would remain rather stable.
http://i122.photobucket.com/albums/o252/captdallas2/climate%20stuff/SouthernoceansSSTwithtanganyiuka.png
Working up from the southern oceans the Nielsen et al. southern oceans reconstruction with the Tierney et al. tropics (lake tanganyika surface temperature) shows a different picture of the thermal oscillations in the oceans.
http://redneckphysics.blogspot.com/2012/09/the-best-place-to-start-is-at-beginning.html
If you want a chuckle, I am looking at how longer term self organizing criticality can make “perfect” proxies of past climate rather easy to misinterpret. Since 40,000 years ago there were grass lands in northern Siberia, I am inclined to believe all glaciations were not created equally. The solar cycles provide a push, but need some help.

September 16, 2012 11:56 am

tallbloke says:
September 16, 2012 at 10:45 am
Thanks Nigel. Probably the most important comment on the thread.
Looks more like propaganda to me, but at least it is right that the next glaciation is tens of thousands of years away.

Gunga Din
September 16, 2012 12:03 pm

davidq says:
September 16, 2012 at 12:18 am
Perhaps we need to widen and deepen the Panama canal. Didn’t the current onset of glaciation start occurring after the Atlantic and Pacific was cut off?
20 Miles wide, 300 feet deep. doable?
=============================================================
Google “Ploughshares”.
There was once a plan to make a sealevel canal to replace the Panama Canal. The leading route was through northern Columbia. The only problem had to do with all the Nukes it would take ….
(It would be kinda’ fun to watch the the reaction of the Envirorn-mentalist to learn that the solution to Ma Gaia’s latest prank was to set off a string of Nukes … through a rainforest no less!)

Eugene WR Gallun
September 16, 2012 12:20 pm

CONSIDER THAT THERE ARE ROCKS ON THE BEACHES OF SCOTLAND THAT GOT BLOWN OVER THE ICE FROM NORWAY ACROSS A FROZEN NORTH SEA
True! Want proof? Never heard of the SLIDING ROCKS OF DEATH VALLEY did you!
“These rocks can be found on the floor of the playa with long trails behind them. Somehow these rocks slide across the playa cutting a furrow in the sediment as they move. Some of these rocks weight several hundred pounds.”
There! Put that in your pipe and smoke it! And don’t give me any claptrap about Death Valley not being a frozen North Sea. The principle has been established by scientific observation. Next thing you know you will be denying the greenhouse effect as it is so widely applied. Wait! Wait! This is about the coming iceage — forget I said anything about the greenhouse effect. Sometimes I just get so confused.
Eugene WR Gallun

Gunga Din
September 16, 2012 12:20 pm

LazyTeenager says:
September 16, 2012 at 11:39 am
There is a contradiction here.
One graph says the ice is back in 3000 years. The other graph says its back in 10-15 thousand years.
The latter was my understanding so personally I am not worrying about glaciers in the near term of the existence of western civilization.
==================================================================
Whichever, you’d need to add 100+ years to it. Hansen said we’d all be well on our way to dying off by then. “Nature can’t take it’s course” till we’re all gone. Isn’t that the mantra? Nature would be fine if it wasn’t for us?

DirkH
September 16, 2012 12:28 pm

Eugene WR Gallun says:
September 16, 2012 at 10:57 am

“This idea of widening the Panama Canal to prevent the next ice age just shows you the absolute silly ignorance of the people who post here on WUWT. THE PANAMA CANAL HAS LOCKS!!!!!!! Any fool knows you would need to dig a SEA LEVEL canal through Nicaragua!”

I don’t think the locks would stop the nukes from working.

DavidG
September 16, 2012 12:33 pm

It seems both Axelrod and Svalgaard don’t know what’s going to happen, it’s a guessing game and rightfully so. Our knowledge is completely insufficient to make determinations about the next ice age. Axelrod seems a bit too certain of his guess and that is most likely where he is wrong; Svalgaard is too certain it isn’t the sun and he doesn’t *know* either. We are in an interglacial and the next one is coming but who knows when. The only thing I do know is not to let any of the morons with ideas of mitigating an ice age get any where near the switches to attempt any of the Rube Goldberg type idiotic ideas posted here.

September 16, 2012 12:41 pm

dallas says:
September 16, 2012 at 11:51 am
Leif said, “no, you are wrong” I don’t think so or I wouldn’t have said it
You obviously didn’t bother to read: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf
“The available evidence supports the essence of the original idea of Koeppen, Wegner, and Milankovitch as expressed in their classic papers [Milankovitch, 1941; Koeppen and Wegener, 1924], and its consequence: (1) the strong expectation on physical grounds that summertime insolation is the key player in the mass balance of great Northern Hemisphere continental ice sheets of the ice ages; and (2) the rate of change of global ice volume is in antiphase with variations in summertime insolation in the northern high latitudes that, in turn, are due to the changing orbit of the Earth.”

DavidG
September 16, 2012 12:45 pm

David Ross says he doesn’t get the mode of traction. That’s easy, 650 million years ago we were on the edge of being a snowball with ice at the equator. Later on, glacial ice melted at the bottom and left the debris of thousands of tons of rocks as it traveled and that’s what we can see in the US West, that proves the ice age happened.

Ken S
September 16, 2012 12:54 pm

Not sure if a link to this paper has been posted above?
AN URGENT SIGNAL FOR THE COMING ICE AGE
By Peter Harris
http://icecap.us/images/uploads/ANURGENTSIGNALFORTHECOMINGICEAGE.pdf
Comments regarding this old paper?

pk
September 16, 2012 12:58 pm

David Ross:
i believe that there is a better sealevel route from atlantic to pacific through nicaruaga. it got a bit of interest when the smart guys started talking about nuculear [sp] excavation in the fifties.
however hidden rice bowls got into the act (mostly panamanian and the threat of the loss of traffic revenues).
then someone pointed out the facts of radioactive fall out (they were not as knee jerk scared of it then) and another group figured out which way the subjective and political winds were blowing.
now days the job would only rate a couple of column inches in the federal rfp advertisements.
catapillar, letourneau and several others would smile though.
C

Ken S
September 16, 2012 1:01 pm

I see that it has already been posted above, so sorry!

P Wilson
September 16, 2012 1:07 pm

Dennis Nikols, P. Geo. says:
September 16, 2012 at 8:57 am
“Very interesting and much food for long term thought. That said, I am taken back in time back to the 1970′s when all the models showed cold was bold. Then again to a later time when models showed heat was neat and CO2 was the key. We must all remember two things. This kind of long term anything based on proxies and models is great cosmology or mythology. Remember to keep a skeptical eye and Mother Nature plays with loaded dice.”
Its interesting how it was thought that cold would lead to calamity, droughts and famines would ensue. When it is relatively warm, then warmth leads to calamity, famines and droughts.
It says (to me) that the human race is never in a good position and good old big government is there to tell us how rotten we are, so that we pay surcharges and taxes to make it right – or until we go into a relative cooling period when the paradigm changes back again as to how awful we are for a cooling climate, and ought to be taxed for that.
Afterall, if you want big taxes from a product, the product has to be vilified first.

Mike McMillan
September 16, 2012 1:11 pm

Well, it’s been nice knowin’ y’all. We’ve had a good Holocene together haven’t we?
In preparation for the glacial advance coming down from Illinois, I’ve gone over to Lowe’s and bought a couple hundred square feet of R-30 for the attic above the computer lab. I plan to wait it out, warm in the glow of my overclocked ‘386. At least until EPA shuts down the local power plant.
Mike in Houston

September 16, 2012 1:14 pm

DavidG says:
September 16, 2012 at 12:33 pm
It seems both Axelrod [sic] and Svalgaard don’t know what’s going to happen, it’s a guessing game and rightfully so. Our knowledge is completely insufficient to make determinations about the next ice age.
You obviously didn’t bother to read: http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf
“The available evidence supports the essence of the original idea of Koeppen, Wegner, and Milankovitch as expressed in their classic papers [Milankovitch, 1941; Koeppen and Wegener, 1924], and its consequence: (1) the strong expectation on physical grounds that summertime insolation is the key player in the mass balance of great Northern Hemisphere continental ice sheets of the ice ages; and (2) the rate of change of global ice volume is in antiphase with variations in summertime insolation in the northern high latitudes that, in turn, are due to the changing orbit of the Earth.”

tallbloke
September 16, 2012 1:23 pm

Leif Svalgaard says:
September 16, 2012 at 11:56 am
tallbloke says:
September 16, 2012 at 10:45 am
Thanks Nigel. Probably the most important comment on the thread.
Looks more like propaganda to me,

Says more about you and your allegiances than it does about Nigel Calder.
but at least it is right that the next glaciation is tens of thousands of years away.
Maybe, but we still don’t know for sure. Major league Icelandic volcanos could change things real quick.

Bill Yarber
September 16, 2012 2:07 pm

Kev-in-UK
We agree completely! And the idea the mankind can “control” or manipulate Earth’s climate in any measurable way is the height of arrogance, ignorance or both!
Bill

September 16, 2012 2:15 pm

There is more to it than this thread provides. See: “Ice Ages and Interglacials” 2nd ed. (403 pages) by D. Rapp (http://www.praxis-publishing.co.uk/9783642300288.htm)

uto
September 16, 2012 2:17 pm

JA says:
September 16, 2012 at 9:41 am
Until scientists can explain with a hi degree of confidence what caused all the historic periods of cooling, warming, ice ages, etc., – and so far they cannot – then all is conjecture. More importantly, scientists have yet to explain how it is that the earth can move from a ball of ice to a very warm period, or vice-versa.
ETC.
= = = = =
Pretty good.
Climate changes.
We know that.
We don’t know why.
WUWT produced, with its readers, a list of possible affectors of climate, some months ago. It was scores of variables long . . . .
Probably some of the notions/ideas/hypotheses above are right.
Which ones?
I don’t know, and I don’t think anyone else does.
From 10,000 [my guess] folk involved predicting climate, it is likely that a handful will get the next 20 years, and the next 500 years, about right.
And how many by luck?
Oh well, Monday dawns soon enouhg here – and I have a commute to the City.
have a great week – come warm or come cold.

September 16, 2012 2:37 pm

Interested parties might wish to consult the figures from Elderfield et al Evolution of Ocean Temperature and Ice Volume through the Mid Pleistocene Transition http://www.sciencemag.org/content/337/6095/704.figures-only
The relationships between the orbital eccenticity and obliquity cycles and global sea levels and ice volume are show very clearly in their fig 4A and B. The 100,000 year eccentricity cycle is modulated by the 41000 year obliquity cycle.When earths eccenticity insolation drops below about 360 w/meter the eccentricity frequency dominates – earlier the obliquity frequencies dominate ( Figs 1a and 1c) and the temperature and sea level variations are smaller.
These major cycle are then themselves modulated by millenium frequency solar activity cycles and they in turn by solar centennial and decadal cycles and lunar orbital cycles, The realtionships between these orbital and solar activity controls on ocean and atmospheric temperatures and CO2 etc have recently been elucidated by Humlum et al http://www.sciencedirect.com/science/article/pii/S0921818112001658
Now that we know how it all works we can obviously forcaste possible climate and temperature trends for the next few decades with some chance of being more right than wrong. SST data show that there has been no net warming since 1997 with CO2 up 8.5%. The PDO suggests a possible 20 – thirty year cooling trend and the Livingston and Penn data suggest the possibilty of a coming Maunder minimum – little Ice Age. In short -in order to mitigate the effects of cooling on world food production we would do well to emit as much CO2 as possible until mid century at least.

September 16, 2012 2:49 pm

If the first graph is any good (??) then
http://www.vukcevic.talktalk.net/toGl.gif
plenty of time to implement SNG Project

September 16, 2012 2:50 pm

In an addition to my previous post I would suggest that Archibald might take a [look] at the SH insolation at 70 – 75 degrees because this seems to be the controller of Antarctic ice extent which is the main climate driver ( impacts excluded ) probably since Oligocene time.

David Archibald
September 16, 2012 2:52 pm

standbythree says:
September 16, 2012 at 5:50 am
I stand corrected, with thanks.

Kev-in-Uk
September 16, 2012 3:00 pm

uto says:
September 16, 2012 at 2:17 pm
agreed.- when it comes to genuinely NATURAL events – we can explain or understand very little. A good example would be genetic mutations – which are seemingly random events in ‘nature’ – sure, we could encourage some by radiation, etc – but the effects are generally quite random. If we consider something we supposedly know something about – e.g. volcanoes, and actually think about how predictable they are (not!), where are we on the risk analysis and risk management scale? I would suggest the only thing we can currently say, with all our study of volcanoes, is – don’t live near one!! Earthquakes would be another good example – sure, we can see/measure them, and we can see patterns – and we know they occur in certain areas – but ‘prediction’ – don’t make me laugh! – and this is a relatively well studied area of a relatively SMALL part of planet! I’d reckon ‘climate’ is at least a couple of orders more complex and massive than an earthquake or volcanoes (in terms of ‘size’) and yet the climate boys reckon they can predict it!! Yeah, right!
As you say – back to work tomorrow………

David Ross
September 16, 2012 3:06 pm

DavidG wrote:

David Ross says he doesn’t get the mode of traction.

Sorry DavidG for being too oblique, I should have been more clear.

rocks … that got blown over on ice from Norway

I’m not an expert -just high school geography. But I live in Scotland and can recognize raised beaches and such. David Archibald makes it sound like the rocks are blown by the wind over the surface of the ice rather than carried with (within, on or under) the ice and deposited as erratics or morraines at its edge or when it retreats (which is the process you describe). My language was just an attempt at humour.

Stones rolling across from Norway?
I don’t get the mode of traction.
Though I try and I try and I try and I try.
Rolling Stones (i.e. the rock band)
I can’t get no satisfaction
Cause I try and I try and I try and I try.

pk wrote:

i believe that there is a better sealevel route from atlantic to pacific through nicaruaga. it got a bit of interest when the smart guys started talking about nuculear [sp] excavation in the fifties.

I suspect a lot of it was political maneuvering i.e. to send a message to the Panamanians wanting more control over or revenue from the existing canal ‘Don’t get Bolshie or we’ll go build a better canal elsewhere.’
Eugene WR Gallun wrote:

This idea of widening the Panama Canal to prevent the next ice age just shows you the absolute silly ignorance of the people who post here on WUWT. THE PANAMA CANAL HAS LOCKS!!!!!!! Any fool knows you would need to dig a SEA LEVEL canal through Nicaragua!
Ignorance! Sheer Ignorance!!!!

Chill out Eugene.
Nobody is really serious -just throwing out science ideas for discussion. It wouldn’t happen in our life times. We’re talking about reversing an event that happened a long time ago.

The closure of the Panama Isthmus during the late Neogene, from about 14 until 2.75 Ma ago [1], caused large reorganizations of ocean circulation [2,3] with strong climatic impact. While the climate of the early to mid-Pliocene was characterized by higher temperatures than present and probably a stronger thermohaline circulation (THC) [4,5], a gradual cooling persisted during the late Pliocene [6], the reasons of which are still unknown. Striking is the temporal accordance of the final closure of the Panama gateway around 2.75 Ma with the intensification of the Northern Hemisphere glaciation
http://mgg.coas.oregonstate.edu/~andreas/pdf/S/schneider06epsl.pdf

Or here
http://www.whoi.edu/oceanus/viewArticle.do?id=2508

Any fool knows you would need to dig a SEA LEVEL canal through Nicaragua!

Ferdinand de Lesseps was not any fool. Neither was John Findlay Wallace. The French intended to build a sea level canal across Panama as did the Americans when they initially took over the project. Technology has moved on a bit since then.
In any particular group with similar interests some things are taken as ‘understood’. It is understood by (almost) everyone here that we’re talking about a sea level breach in the Panamanian Isthmus -wide and deep enough for, not just ships, but ocean currents to pass through. It would be a huge geo-engineering project but do-able (removing existing locks would be the least of problems).
Backing up your arguments with evidence and propounding them in a civil manner is the best way to convince people, but any fool knows that.

David Archibald
September 16, 2012 3:06 pm

george e. smith says:
September 16, 2012 at 11:06 am
The author of the Milankovitch file (the link to it is provided above) is anonymous. It looks like he constructed the file to satisfy his own natural curiosity in February this year and then gave it to all Mankind in March. You are able to examine the file yourself and come to your conclusions on its veracity. As Lubos Motl said, I think it is really great.

September 16, 2012 3:11 pm

Dr. Norman Page says:
September 16, 2012 at 2:37 pm
These major cycle are then themselves modulated by millenium frequency solar activity cycles and they in turn by solar centennial and decadal cycles and lunar orbital cycles,………. Now that we know how it all works…….
We are making progress. There is also Geo-Solar cycle (details in print soon) which attempts to explain the decadal temperature changes
http://www.vukcevic.talktalk.net/GSC1.htm
Dr. Page, the progress is slow but inevitable.

Rob Dawg
September 16, 2012 3:28 pm

In the interests of balance anyone objecting to this climate model for being a model is obliged to do the same for all the warmist models.

ExWarmist
September 16, 2012 3:47 pm

http://en.wikipedia.org/wiki/Toba_catastrophe_theory
Links to human population bottleneck within the article

SØREN BUNDGAARD
September 16, 2012 4:02 pm

The sun gets its power from the outside – not inside!
http://youtu.be/A6p7PfCziiA

MikeP
September 16, 2012 4:04 pm

This might be a bit off topic, but does anybody know why the sea level graphs on the ENSO page have not been updated in a coon’s age?

September 16, 2012 4:05 pm

tallbloke says:
September 16, 2012 at 1:23 pm
“but at least it is right that the next glaciation is tens of thousands of years away.”
Maybe, but we still don’t know for sure. Major league Icelandic volcanos could change things real quick.

Or an asteroid could hit us, or Yellowstone could blow up, or …
None of this has happened the past 750,000 years while the climate has faithfully been following the Milankovitch cycles, so it seems a bit silly to invoke the ‘maybe this, maybe that’ defense.

September 16, 2012 4:40 pm

Leif, Have mercy! That is one big a$$ spreadsheet and unfortunately incomparable with my dinky openoffice.
http://i122.photobucket.com/albums/o252/captdallas2/climate%20stuff/westerncaribbean.png
That is only 465,000 years of western Caribbean sea surface temperatures. Nothing personal, but I don’t live in the Antarctic. While I couldn’t load the solar forcing to do a proper comparison, I did eyeball a few similarities and a few not all that great matches with 8K and 10K lagged ice mass. I have no doubt that the orbital cycles are the cat’s a$$, I just don’t think ice is all that great an indication of what really happens in an ice age. Relating forcing to the main thermal mass of the Earth is a better route IMHO.

clipe
September 16, 2012 4:41 pm

O/T but would this AP article see the light-of-day in 2012?
“Perhaps, after 10,000 years of retreat from the ice-age maximum, researchers turned on their instruments just in time to catch the stabilization or re-advance of the ice sheet,” Richard B. Alley of Pennsylvania State University, wrote in a commentary accompanying the Science paper.
http://www.usatoday.com/news/science/cold-science/2002-01-18-wais-thicker.htm

September 16, 2012 4:42 pm

dallas says:
September 16, 2012 at 4:40 pm
Leif, Have mercy! That is one big a$$ spreadsheet and unfortunately incomparable with my dinky openoffice.
You didn’t get it from me [I think, but correct me if I’m wrong – which is it?]

Bill Illis
September 16, 2012 4:42 pm

Here is Alert Canada’s maximum temperatures over the past 6 months (it was about 1.5C above normal this summer but one can get the picture). Alert is basically ground Zero for the resumption of the ice ages (perhaps the Arctic sea ice not melting out at all in the summer would be another).
Alert July high temperatures of 20C (average 10C).
The snow melted out on June 16th and returned on Sept 5th. So there needs to be quite a bit of cooling here before the snow makes it through the summer and the July high temperatures.
Higher elevations and the Torngut mountain chain which goes down through Baffin Island into northern Quebec is another story but solar insolation needs to fall down to 440 W/m2 (versus today’s 480 W/m2) before the snow makes it through the summer. That may not happen for even 170,000 years.
http://s9.postimage.org/w8hkx23r3/Alert_Max_Temps_2012.png
Here is a Zoom-in of 65N June solar insolation for the next 5,000 years. It declines by a tiny amount over the next 1,000 years before going back up (for anywhere between 50,000 years and 170,000 years.)
http://s14.postimage.org/stpo0vf5d/65_N_June_Solar_insolation_10k.jpg

gringojay
September 16, 2012 5:07 pm

Glaciers will cover our crop land someday; but since Maize offers 3,700 kcal/Kg -1 while average beetle grubs provide 5,964 kcal/Kg -1 humans can survive as they “bug-out”. Sure it might be too cold outside to fish; but mealy worms are 20% protein which can thrive in a box.

Mike McMillan
September 16, 2012 5:32 pm

A few points on the Panama Canal.
The Pacific Ocean is higher than the Atlantic/Caribbean, less than a foot, not enough to generate any power, but enough to establish a salt water flow from the Pacific and introduce a lot of Pacific species to the Caribbean. Don’t know exactly how that would work out, but probably not well.
Gatun Lake in Panama drains both directions to the oceans, This fresh water barrier halts a lot of species introduction.
We’d still need locks in a sea level canal, due not so much to the elevation difference, but due to the tides. Pacific tides are vastly greater than what the Caribbean can muster.
The best non-Panama route for a canal is through Nicaragua, following the river that forms the border with Costa Rica, then across Lake Nicaragua, then down to the Pacific. This still needs locks, because Lake Nicaragua is around a hundred feet above sea level, and the 10 mile stretch to the Pacific drops a steep 10 ft per mile.
If it warms up enough, maybe we’ll be able to keep the Northwest Passage open so we won’t need the canal so much.

TomRude
September 16, 2012 5:49 pm

Kukla said: “The last glacial was accompanied by the increase of areally averaged global mean surface temperature, alias global warming. … But also increasing was the temperature difference between the oceans and the poles, the basic condition of polar ice growth. Believe it or not, the last glacial started with “global warming”!
Indeed known and the mechanism is well explained by Marcel Leroux -Dynamic Analysis of Weather and Climate, Praxis-Springer 2010-, whose work was respected by Kukla.

September 16, 2012 5:52 pm

Leif, I clicked on the link in the post but for some reason the only parts I could read were links to your site.
http://i122.photobucket.com/albums/o252/captdallas2/climate%20stuff/westerncaribbeanwithTanganyika.png
While I am here, working back from the southern hemisphere I am finding internal oscillations that appear to respond at different rates to solar forcing depending on their thermal inertia. A.M. Selvam is one of those chaos kinda ladies which started me down this self organizing criticality road. With solar nudging instead of completely driving, the differences in the ice ages make sense, if you follow the energy through the system. 45S to 65S has the most stability, so it is the easiest starting point to explain were Milankivic appears to be off, when actually he pretty much nailed it.

mike g
September 16, 2012 6:00 pm

@kadaka (KD Knoebel)
“Cover the moon in foil.” I’m not sure this would raise the brightness of the moon as seen from Earth. The current situation is that light away, from the center of the disk, as seen from Earth, can be reflected towards Earth by objects that cause the moon’s surface to depart from a perfect spherical geometry–from mountains down to the level of microscopic dust particles. Cover it with foil, and much of the light reflected to our line of sight from the vast majority of the surface, off the axis along our line of sight, will be reflected out into space.

September 16, 2012 6:36 pm

I hope everyone understands there is no gainsaying TOA insolation history and future as described by Milankovitch cycles–this is basic physics working with zero unknowns. And what took Milankovitch a lifetime to estimate can be done with digital precision in seconds. Nor is there any gainsaying the delayed correlation between 18O and insolation. You may argue its interpretation but for my money typical reconstructions of T, ice mass, and ice surface explain the data adequately. And nobody is claiming M cycles caused the LIA or MWP; you add solar irradiance to orbital parameters to approach the whole picture.
The fact that M cycles are the obvious primary cause of ice ages is what conclusively took CO2 out of the picture even before its lag was determined, and it is dismaying to see skeptics deny their role in long term climate behavior. –AGF

nevket240
September 16, 2012 6:38 pm

We need a real good top shelf glaciation to save the reefs. No BS. The reefs are on their last legs according to large amounts of public funding.
http://www.smh.com.au/environment/climate-change/time-running-out-to-save-coral-reefs-scientists-say-20120917-260yg.html
Thank goodness the SMH is always on the ball with quality scientific articles like this one.
regards

nevket240
September 16, 2012 6:41 pm

http://www.brisbanetimes.com.au/environment/climate-change/staggering-arctic-ice-loss-smashes-melt-records-20120917-260zu.html
anyone lese spot the hubris.
The Arctic icecap alone regulates the earths temperature. I thought it was Big Als contrails.
regards

September 16, 2012 6:45 pm

Leif Svalgaard writes,
“This is not Archibald’s assertion, but that of Milankovitch, Koeppen, and Wegner back in the 1940s. And most of Archibald’s article is borderline wrong. E.g. if you look at his first Figure it should be evident that temperatures the next 30,000 years are heading up, not down.”
If you look at that first chart again you can see that it is ALWAYS below the 510 watts/sq metre threshold therefore no true warming is occurring for the next thirty thousand years.Thus it is ALWAYS on the cooling side of the line that make the snow and ice fields to grow.

September 16, 2012 7:06 pm

dallas says:
September 16, 2012 at 5:52 pm
Leif, I clicked on the link in the post but for some reason the only parts I could read were links to your site. http://i122.photobucket.com/albums/o252/captdallas2/
I don’t recognize that plot and don’t know what you clicked on and what you got, sorry.
sunsettommy says:
September 16, 2012 at 6:45 pm
Thus it is ALWAYS on the cooling side of the line that make the snow and ice fields to grow.
Yet today is also below that line and it is warming [AKA Global Warming]

September 16, 2012 7:47 pm

Dr. Svalgaard writes,
“Yet today is also below that line and it is warming [AKA Global Warming]”
Your reply indicate that you are willing to ignore the fact that LONG TERM cooling is in the chart for the next 50,000 years.Since I used the same chart YOU brought up you will have to accept the 510 line as I pointed out that show cooling is the trend BECAUSE it is already below the 510 line from now one for a long long long time.
The last 1,000 years is a cooling trend too but who is paying attention to that? You or ……?
Since the Minoan Warming time the warming epochs have been around 350 years long and the Modern Warming is already about 340 years long since the bottom of the LIA that was in the 1670’s.

September 16, 2012 7:59 pm

To continue along this line of thinking is that the last 4 main warming epochs in the Holocene have been about 1,000 years apart and last around 350 years.There is a decline from the days of the Minoan warming to now and still on line today.
The Minoan then the Roman then the Medieval and now the Modern warming are actually part of a long term cooling trend as shown by this Chart:
http://c3headlines.typepad.com/.a/6a010536b58035970c01287656565a970c-800wi
http://www.c3headlines.com/2009/12/are-modern-temperatures-unprecedented-us-govt-greenland-ice-core-research-finds-theyre-not-even-clos.html
John Kehr posted some nice charts too:
http://theinconvenientskeptic.com/wp-content/uploads/2012/01/Chap_8-Illustration_65-550×450.png
http://theinconvenientskeptic.com/chapters-8-10/

Bill H
September 16, 2012 8:04 pm

tallbloke says:
September 16, 2012 at 6:57 am
I’ll just add that it’s worth noting that 65N insolation didn’t drop as far as at the end of the last half dozen or so interglacials, we’re already past the low point, and the Holocene is already longer than several past interglacials. Also, 65N insolation is not the only important factor. Eccentricity times well with the periodicity of glacial interglacial cycles.
We might be in luck. I hope so, even if it means we just keep getting warmer and the AGW theorists carry on holding sway with their mumbo jumbo. I’d rather put up with bad science than the onset of a glacial.
Hopefully, the shorter term multidecadal drop in T both David and I (and many others) expect from around 2014 onwards will put paid to the AGW meme forever anyway, once nature has performed the crucial experiment for us.
———————————————————————————-
as a layman in looking at things, this has the appearance of an egg sitting a top a pointy wall and just the slightest breeze will send it crashing… now if a moderate to large volcano goes off it could be just enough breeze to send it over…. with the warming factors gone and cooling already started in the oceans it will be a rather rapid fall into cold…
everyone is such a bearer of good news… man does not far well in cold…viruses and other things grow well in cool and wet climates… just a bad recipe for man in general..

kadaka (KD Knoebel)
September 16, 2012 8:04 pm

@ mike g on September 16, 2012 at 6:00 pm:
Among other things, if we’re approaching that as a serious proposal, the foil doesn’t have to match the existing contours. Flat sections can be placed on supports oriented towards the Earth. Imagine the Moon covered in millions of reflectors. It can be a focusing array directed at the Earth in general.
That’ll make for a cyclical signal, nothing but reflected Earth-shine for new moon, and rather bright nights for full moon, about nine times as bright.
Hey, if a few extra watts per square meter in retained longwave infrared is enough for global warming, leading to predicted catastrophic global warming, the contribution from a shiny Moon directed at Earth should be good for something, right?

Gunga Din
September 16, 2012 8:12 pm

For those of you that googled “ploughshares” and got a bunch of anti-nuke hits, try “Operation Ploughshare”.
I first heard of the plan to make a sealevel canal using nukes when I was in elementary school. I think it was a feature in Scholastic Magazine. I think Scholastic Magazine is also where I first heard about the threat of a “nuclear winter”. Go figure.

Paul Marko
September 16, 2012 8:18 pm

Eugene WR Gallun says:
September 16, 2012 at 12:20 pm
CONSIDER THAT THERE ARE ROCKS ON THE BEACHES OF SCOTLAND THAT GOT BLOWN OVER THE ICE FROM NORWAY ACROSS A FROZEN NORTH SEA
True! Want proof? Never heard of the SLIDING ROCKS OF DEATH VALLEY did you!
“These rocks can be found on the floor of the playa with long trails behind them. Somehow these rocks slide across the playa cutting a furrow in the sediment as they move. Some of these rocks weight several hundred pounds.”
The sediment the rocks are furrowing in is a mud cracked shallow playa lake basin that contained water when temperatures fell below freezing. The shallow surface water froze encapsulating the rocks. Wind moved the ice sheets transporting the rocks leaving their scour path in the muddy bottom. The scour paths are mud cracked, indicating the rocks moved while the playa lake contained water.

September 16, 2012 8:27 pm

sunsettommy says:
September 16, 2012 at 7:47 pm
Your reply indicate that you are willing to ignore the fact that LONG TERM cooling is in the chart for the next 50,000 years.
That is a red herring. There will be long-term warming the next 30,000 years, and only then will it cool. And that glaciation will be mild. There is a 400,000 year cycle due to changes in the eccentricity of the Earth’s orbit. The next 100,000 years the orbit will be nearly circular so no modulation due to eccentricity. The remaining modulator is the tilt of the axis [the obliquity], but its effect in smaller so the glaciation will be milder. You see the various cycles here http://www.leif.org/research/Solar-Insulation-Cycles.png. The blue dot is where we are now.

September 16, 2012 9:00 pm

There’s no chance of glaciation with modern man dominating the planet. Methane production from man and natural methane release from current warming will preclude the next ice age. What could have been the next ice age will probably not make a dent in the warming. If by some chance the natural cycle overtook man’s warming, mankind will already have technology developed to avert an ice age. Global warming remains the problem of the day and the problem for generations to come.

RoHa
September 16, 2012 9:04 pm

Details, details, details…
Let’s get to the main point.
WE’RE DOOMED!

September 16, 2012 9:37 pm

There will be no “next glaciation” as long as modern man dominates the Earth. While we can debate the onset of the next cooling cycle, the planet is current warming and warming rapidly. Methane production from man and natural methane release will likely accelerate it still further. If the next cyclical glaciation can actually take hold, mankind will prevent it from occurring. We’re great at warming the planet. Everything we do warms the planet. A few hundred years from now (let alone thousands of years from now) we’ll be technologically advanced enough to prevent cooling altogether. Global warming and not cooling remains the issue for this and immediate future generation.

george e. smith
September 16, 2012 10:18 pm

“””””…..Onset of interglacials is driven by insolation at 65°N. That is where the landmass is that is either snow-covered all year round or not. It seems that insolation above 510 watts/sq metre will end a glacial period……”””””
So I read this statement, without attribution, and thereby ascribed it to the author of the Guest Post; DA; who did not refute it’s validity.
I do that myself; no way I can remember the original author of everything I have learned (by reading) over the last half century. But if I use it, I tend to mean I agree with it.
So I used imprecise English, when I referred to: “””””…..So Dr Svalgaard, before I read your reference (which I will), it occurs to me, that Dr Archibald’s assertion (that 65N insolation drives interglacial onsets), is not at all inconsistent, with your suggestion that orbital changes are the key……”””””
So forget I said anything. maybe next time I will write in Maori, since my pidgen English never got my original question answered.

Lightrain
September 16, 2012 10:38 pm

I’m very skeptical, but the AGW proponents seem to have enough forward movement that even in the Oil Sands province they’re proposing various ways to reduce CO2 or they’ll limit oil production. By the time the hard evidence is in showing no correlation between CO2 and temperature the damage will have already been done. You think they’re going to reverse everything and hang the greenies out to dry? I don’t think so, the last hope is for the Republicans to get elected and take immediate and severe action ASAP. If we ever get a carbon tax and the temperatures start to fall, as they will for the next 50,000 years guess who will say he saved us, no not JC but JH.

September 16, 2012 10:45 pm

Eugene WR Gallun says: September 16, 2012 at 10:57 am
“This idea of widening the Panama Canal to prevent the next ice age just shows you the absolute silly ignorance of the people who post here on WUWT. THE PANAMA CANAL HAS LOCKS!!!!!!! Any fool knows you would need to dig a SEA LEVEL canal through Nicaragua!”
So Eugene, are you extrapolating from ONE post to the entire population of posters at wattsup?
You might want to check your sample size versus your population.

BezorgdeBurger
September 16, 2012 11:12 pm

What the heck, just bought the Super Gore CAGW Disaster-kit (shark-harpoon included) and what now? Should I get the new Ultra Gore Coolheaded Relief- or Reversal-kit, but it has to come with an free Ice-hockey stick what should I else do on the ice-plain?

September 16, 2012 11:21 pm

johnpetroff says: September 16, 2012 at 9:37 pm
“There will be no “next glaciation” as long as modern man dominates the Earth. While we can debate the onset of the next cooling cycle, the planet is current warming and warming rapidly.”
I disagree John. The satellite record, which is the only reliable scientific record of current global temperature, shows no net warming for 10-15 years.
To be clear, I think Earth is at the end of a natural cyclical warming period and is about to enter a cooling period, which could be moderate or severe. This cooling will be apparent by 2020-2030 (or sooner) and could be as severe as the Dalton Minimum circa 1800 or the Maunder Minimum circa 1700. I’d rather be wrong about this prediction.
Since there is no evidence that atmospheric CO2 has any significant impact on global warming, I do not see that mankind’s current fossil fuel burning activities have any significant impact on climate, either for better or worse. The only apparent impact of increasing atmospheric CO2 is to make little flowers happy.
I’m not convinced that whatever we do regarding methane will make any difference either. If running around shoving corks up the backsides of bovines is someone’s cup of tea, then let them proceed, but at their sole risk. Just do not expect it to have any impact on climate, and don’t send me the bill. 🙂

September 17, 2012 2:14 am

Allan MacRae says:
September 16, 2012 at 11:21 pm
To be clear, I think Earth is at the end of a natural cyclical warming period and is about to enter a cooling period, which could be moderate or severe. This cooling will be apparent by 2020-2030 (or sooner) and could be as severe as the Dalton Minimum circa 1800 or the Maunder Minimum circa 1700. I’d rather be wrong about this prediction.
That appear what the available data shows too.
I tend to ignore all the hype, make use of available data, extrapolate and observe.
Here are two examples of the extrapolation I’ve done: solar magnetic activity (Stanford WSO) and the 350 year CET record (UK Met office)
http://www.vukcevic.talktalk.net/LFC2.htm
http://www.vukcevic.talktalk.net/CET-NV.htm
One might say, we do agree.

kadaka (KD Knoebel)
September 17, 2012 2:34 am

From johnpetroff on September 16, 2012 at 9:37 pm:

There will be no “next glaciation” as long as modern man dominates the Earth.

You have an interesting and highly exaggerated view of the importance of humanity on this planet.

While we can debate the onset of the next cooling cycle, the planet is current warming and warming rapidly.

Not really.
HADCRUT3 variance-adjusted global mean:
(click on “Raw data”)
start of record (1850) to 2000: slope = 0.00369995 per year
from 2000 to now: slope = -0.000162412 per year
GISTEMP LOTI (land-ocean temperature index) global mean:
start (1880) to 2000: slope = 0.00541299 per year
2000 to now: slope = 0.0062104 per year
RSS MSU lower troposphere global mean:
start (1979) to 2000: slope = 0.0145225 per year
2000 to now: slope = 0.000495936 per year
UAH NSSTC lower trop. global mean:
start (Nov 1978) to 2000: slope = 0.0104104 per year
2000 to now: slope = 0.012143 per year
And by the WoodForTrees temperature index, which is the mean of those indexes:
start (1979) to 2000: slope = 0.0134049 per year
2000 to now: slope = 0.00459503 per year
Thus the warming has dramatically slowed, and the Earth is not warming rapidly.

Methane production from man and natural methane release will likely accelerate it still further.

Let’s look at the alarming sources of methane from an alarming source, GISS. See Figure 2-1, Global sources of methane.
29% is labeled Natural.
19% is Coal and Oil Mining and Natural Gas extraction, releasing trapped methane from underground, labeled Anthropogenic.
16% is Enteric Fermentation, which is actually the burps and farts of livestock like cattle. Since those animals would not exist without humans raising them for food, just like if humans never existed then there would never have been massive herds of buffalo covering the American plains, that’s labeled Anthropogenic.
Rice cultivation is 12%, Anthropogenic. Biomass burning 8%, Anthropogenic. Sewage treatment and Animal waste are both 5%, and since humans, their livestock, and their pets all poop that’s Anthropogenic. Landfills 5%, from decomposing banana peels and dirty diapers, Anthropogenic.
So if you’re worried about methane production causing global warming and even accelerating it, simply stop humans from growing food, from raising livestock for food, from burning fuels, and stop humans from eating food, and the problem goes away.

A few hundred years from now (let alone thousands of years from now) we’ll be technologically advanced enough to prevent cooling altogether.

Says here:

The total solar energy absorbed by Earth’s atmosphere, oceans and land masses is approximately 3,850,000 exajoules (EJ) per year.[7] In 2002, this was more energy in one hour than the world used in one year.[12][13] Photosynthesis captures approximately 3,000 EJ per year in biomass.[9] The amount of solar energy reaching the surface of the planet is so vast that in one year it is about twice as much as will ever be obtained from all of the Earth’s non-renewable resources of coal, oil, natural gas, and mined uranium combined.[14]

When the energy from the Sun becomes insufficient and the planet is ready to tip back into glaciation, how can we mere humans generate enough energy to make up the difference and keep that from happening? Zero-point energy devices? Dilithium crystals?

Global warming and not cooling remains the issue for this and immediate future generation.

But if we worry about global warming so much that we dramatically reduce our GHG emissions, and take the rate of warming to nothing and perhaps induce planetary cooling,
Then when it’s time to stop planetary cooling and prevent glaciation, we’d have lost the warming effect of those greenhouse gasses, making for an even larger energy deficit to make up.
So what do we do then? Suddenly start burning all the fossil fuels remaining we can get at, until the atmospheric CO₂ concentrations get up to 600 parts per million, 1000ppm, whatever it takes to get a sufficient countering amount of anthropogenic global warming effect?
Or can the technologically-advanced humans of that time just dramatically increase the number of in-orbit zero-point energy devices radiating warmth down to the surface?

September 17, 2012 3:30 am

This is a very interesting article, Anthony. Most scientific researches and predictions that the public are not very much receptive to end up to be true. We just have to know now when will the next glaciation will happen and how we can prepare for it.

September 17, 2012 4:30 am

To Allan and other skeptics, yes we are currently warming, and we’re warming in what should be a cooling period:
http://pielkeclimatesci.wordpress.com/2012/09/05/global-temperature-report-august-2012-from-the-university-of-alabama-at-huntsville/
For August, Watts said the .34 degrees Celsius warming is not substantial. I believe it is substantial. It is well above the average warming for the last decade.
To kadaka: ALL your graphs are measuring warming. Several show the warming plateauing. But that’s not temperatures plateauing, that’s INCREASES in temperature plateauing, while temperatures continue to rise. Plus, one can easily find measurements showing warming accelerating:
http://data.giss.nasa.gov/gistemp/2011/
We are currently at a record low Arctic Ice Extent and the positive Antarctic Ice Extent anomaly still leaves a deficit over a million square kilometers.
http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/global.daily.ice.area.withtrend.jpg
I’d love for cooling to occur. I’d love for man’s activities to have little impact on the planet. But we have overwhelmed the planet. For a period of rising temperatures when temps should be cooling, one can easily correlate that to the activities of man: higher carbon dioxide and methane levels in the atmosphere.
How do we add greenhouse gases and NOT have temperatures go up?
I’ll keep hoping for cooling, but after all the spin is done, even the cooling arguments are showing warming.

Ian W
September 17, 2012 4:38 am

Justthinkin says:
September 16, 2012 at 11:41 am
ExWarmist says:
September 16, 2012 at 5:25 am.
Note that humans were bottle-necked down to approx 3000 individuals in the last glaciation and almost died out.
Interesting.Got a link for that ,please.
And as for glaciation,no need to panic.We Canucks get it every year,but glorious AGW fights it off for us. :):)
And of course,any scientist worth more than a plugged nickel knows warm is good,cold is bad.

There is a brief description here
http://en.wikipedia.org/wiki/Toba_catastrophe_theory
with some links. There are other papers too if you take a brief look.

September 17, 2012 5:29 am

One more thing, I’ve located a good place for the next glaciation to begin should it actually occur. While the Greenland Ice Sheet is huge, it probably has nothing to do with ice in North America. There is a small remnant to the Laurentide Ice Sheet that covered North America during the last glaciation. The Barnes Ice Cap is a small glacier on Baffin Island that seems NOT to be associated with mountains. It contains some of the oldest ice in Canada.
The Penny Ice Cap is also on Baffin Island, but it seems somewhat associated with mountains. Barnes sits out in the open by itself. If a new glaciation were to occur, it very well COULD start at the Barnes Ice Cap. The last remnant of the last glaciation would be a practical starting point for the ice sheet of the next glaciation.
However, if the Barnes Ice Cap continues melting or disappears entirely, it proves warming is continuing even at what may be the starting point or even the heart of the next glaciation.
Regardless of its significance to the next glaciation, I’ll be very sad if the Barnes Ice Cap disappears in my lifetime.
http://pubs.usgs.gov/pp/p1386j/baffinisland/baffin-lores.pdf

beng
September 17, 2012 6:22 am

****
Bill Illis says:
September 16, 2012 at 4:42 pm
Here is a Zoom-in of 65N June solar insolation for the next 5,000 years. It declines by a tiny amount over the next 1,000 years before going back up (for anywhere between 50,000 years and 170,000 years.)
http://s14.postimage.org/stpo0vf5d/65_N_June_Solar_insolation_10k.jpg

****
Thanks, I was looking for a zoom-in on that. If we could just squeeze by the next couple thousand yrs, we might avoid a new glaciation. Hopefully we’re at a natural cusp (the present, relatively small variation in Milankovitch cycling) where the previous pattern of glaciation is (prb’ly temporarily) interrupted — not that it’ll affect any of us. 🙂
Despite some predictable nonsense, this is an interesting post.

September 17, 2012 6:27 am

Allan MacRae says: September 16, 2012 at 11:21 pm
To be clear, I think Earth is at the end of a natural cyclical warming period and is about to enter a cooling period, which could be moderate or severe. This cooling will be apparent by 2020-2030 (or sooner) and could be as severe as the Dalton Minimum circa 1800 or the Maunder Minimum circa 1700. I’d rather be wrong about this prediction.
vukcevic says: September 17, 2012 at 2:14 am
One might say, we do agree.
Thank you for the interesting graphs vukcevic. So we agree that global cooling will commence in the next few years.
I presume we also agree that humanity and the environment do better with modest global warming versus cooling.
If so, then let’s hope we are both wrong in our predictions, or that the imminent global cooling will be moderate and not severe..
I am in the odd position of wishing that the warmists were correct, but seeing NO evidence that they are. The warmists predictive record has been 100% wrong to date, so why should they change now – they seem to have found their discomfort zone. 🙂

September 17, 2012 6:34 am

Dr. Svalgaard writes:
“That is a red herring. There will be long-term warming the next 30,000 years, and only then will it cool. And that glaciation will be mild. There is a 400,000 year cycle due to changes in the
eccentricity of the Earth’s orbit. The next 100,000 years the orbit will be nearly circular so no modulation due to eccentricity. The remaining modulator is the tilt of the axis [the obliquity], but its effect in smaller so the glaciation will be milder. You see the various cycles here http://www.leif.org/research/Solar-Insulation-Cycles.png. The blue dot is where we are now.”
Thank your for your link.
I am only talking about the chart YOU brought up all along and it shows that the next 50,000 years will be below the 510 level David talked about:
“It seems that insolation above 510 watts/sq metre will end a glacial period.”
Since we are BELOW that level NOW and the chart he posted shows that it stay below that level for next 50,000 years and that he labeled it as “The next glacial period” surely that is no red herring sir?
David also pointed out:
“For the last 8,000 years, the Earth has been cooling at 0.25°C per thousand years, so the oceans are losing heat.”
Long term cooling is evident and now that insolation has fallen below the threshold line into the negative territory the glaciers that did not exist in the north 2,500 years ago are now advancing today and new glaciers have appeared more recently in the United States and even in South America too all mentioned by photos and captions in John Kehr’s link.The glacial evidence is growing as we go deeper into the climate Autumn.
Now I refer to a different chart by John Kehr who show that even while it WAS still above the insolation threshold it was cooling anyway because it was on the downward slope that went negative around 3,000 years ago:
http://theinconvenientskeptic.com/wp-content/uploads/2012/01/Chap_8-Illustration_71-550×380.png
http://theinconvenientskeptic.com/chapters-8-10/
There are a number of places where large glaciers exist that were NOT even there during the Roman and MWP and easily surviving this Modern Warm Period.He mentioned a few of them in the above link with photo’s.
It appears that you say that this upcoming climate winter (glacial period) will be milder than the previous one because of a less favorable orbital positions and I will not argue with it because that was never my contention on whether it was going to a mild one or a severe one.It was about whether it was on the cooler side of the 510 level David pointed out in the chart.
I see that the next 50,000 years being below the 510 line therefore it is a cooling one and a glacial period.That is what the Chart shows and what David says about it.The severity of the upcoming glacial period is another topic of discussion.

richardscourtney
September 17, 2012 6:52 am

johnpetroff:
At September 17, 2012 at 4:30 am you say

one can easily find measurements showing warming accelerating:

All global temperature data sets show temperature has had no statistically significant trend for the last 10 years and some show no trend for the most recent 15 years.
Stasis is NOT acceleration.
Richard

Jean Parisot
September 17, 2012 8:39 am

Is there a baseline glacial rebound rate one can glean from the Little Ice Age? Might as well start with something that was measured directly.

D. J. Hawkins
September 17, 2012 9:51 am

davidq says:
September 16, 2012 at 12:18 am
Perhaps we need to widen and deepen the Panama canal. Didn’t the current onset of glaciation start occurring after the Atlantic and Pacific was cut off?
20 Miles wide, 300 feet deep. doable?

Google “Operation Plowshare”. 😉

Billy Liar
September 17, 2012 10:47 am

johnpetroff says:
September 17, 2012 at 5:29 am
However, if the Barnes Ice Cap continues melting or disappears entirely, it proves warming is continuing even at what may be the starting point or even the heart of the next glaciation.
Regardless of its significance to the next glaciation, I’ll be very sad if the Barnes Ice Cap disappears in my lifetime.

Having looked at your link, I’d say:
It’s dead, Jim.
BTW It’s very unlikely that things will ever stay the same. Your favorite ice cap is either going to melt or start growing. If it starts growing – the next glaciation will have started.

Jim G
September 17, 2012 10:59 am

Leif Svalgaard says:
Don’t throw out the wild cards of volcanic activity or cosmic strikes as they may have contributed to past more rapid glaciations. Like a booster shot for the Milankovitch cycles. The Earth is, after all, about 70% covered by water making finding of such past evidence difficult to say the least.

September 17, 2012 11:43 am

To Richard, you say:
“All global temperature data sets show temperature has had no statistically significant trend for the last 10 years and some show no trend for the most recent 15 years.”
Here’s a page from a very “global cooling” or “stasis” website:
http://www.c3headlines.com/2012/01/nasas-research-substantiates-trend-towards-global-cooling-human-global-warming-from-co2-has-disappea.html
It appears to show cooling or stasis for the past 12 years or so. An article accompanies the graphs saying as much. Upon further inspection however, ALL values for the past 15 years are ABOVE ZERO, which means perceived graphical cooling is actually SLOWER WARMING. The graph does show a runaway CO2 arrow which is interesting.
Here’s a master graph page:
http://www.google.com/search?q=giss+global+temperature+graph&hl=en&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=TGdXULq1LevuiQLV-IGABA&ved=0CEQQsAQ&biw=1200&bih=1829
There are many graphs here to choose from. I’m going to look and see if I can find any that actually say “cooling” or “stasis” for the last 15 years. My point is, when you look closely at graphs that people say show “cooling” or “stasis,” they actually show decreased warming.
This summer was the second warmest on record for the Northern Hemisphere and third warmest on record for the USA according to NOAA. Here’s a post with associated links. Note the record low ice extent. Would we really have summer arctic ice extent at a record low and values cut in half from 10 years ago if we had stasis or cooling?
http://www.ncdc.noaa.gov/sotc/
I’ll hold out hope for genuine cooling statistics, but as I said, when I explore “cooling” graphs and websites, they’re actually selling slower warming. If I find genuine stasis or cooling numbers I’ll post them and you do likewise.

Dan B
September 17, 2012 12:20 pm

davidq says:
September 16, 2012 at 12:18 am
Panama might object ;>
And before I forget. This article stated the Boomers had enjoyed 50 years of relative peace. I’ll give you 40, Viet Nam was not even relative peace for those in the states at 18.

Manfred
September 17, 2012 12:31 pm

I don’t get this. The first graph shows us currently at a minimum, the second at a maximum and both graphs are said to correlate with temperature.

richardscourtney
September 17, 2012 12:41 pm

johnpetroff:
You claimed that warming is accelerating and I replied by pointing out

All global temperature data sets show temperature has had no statistically significant trend for the last 10 years and some show no trend for the most recent 15 years.
Stasis is NOT acceleration.

At September 17, 2012 at 11:43 am you have responded to that saying

Here’s a page from a very “global cooling” or “stasis” website:
http://www.c3headlines.com/2012/01/nasas-research-substantiates-trend-towards-global-cooling-human-global-warming-from-co2-has-disappea.html
It appears to show cooling or stasis for the past 12 years or so. An article accompanies the graphs saying as much. Upon further inspection however, ALL values for the past 15 years are ABOVE ZERO, which means perceived graphical cooling is actually SLOWER WARMING.

POINT 1
Stasis is NOT acceleration.
POINT 2
Stasis is NOT “slower warming”: it is a cessation of warming.
POINT 3
You are fooling nobody except possibly yourself.
Richard

J Martin
September 17, 2012 1:11 pm

johnpetroff.
You like to trot out links and graphs from discredited organisations and individuals such as GISS, NOAA. But you may not be aware of the extent to which past temperature data has been massaged.
There have been other articles on WUWT demonstrating similar inappropriate behaviour with data thus falsely allowing them to claim record temperatures in recent times when in fact the record temperatures were in the past.
One example is this link below;
http://www.c3headlines.com/2011/12/science-by-lubchencos-noaa-fake-global-warming-by-changing-historical-temperature-data.html

J Martin
September 17, 2012 1:42 pm

johnpetroff.
And here’s another link for you. There are more on WUWT, but takes time to find.
http://stevengoddard.wordpress.com/2012/09/16/unprecedented-climate-cheating-going-on-at-noaa-in-2012/

Kev-in-Uk
September 17, 2012 1:42 pm

johnpetroff says:
September 17, 2012 at 11:43 am
Sir, your interpretation of your linked graphs seems somewhat obtuse (I am being polite !) – but in reality, there is absolutely no merit in trying to defend the indefensible. In the last 10+ years CO2 has risen, whilst temps have not – that’s it, and THAT is with MASSAGED data!
Now, for the sake of completeness, I would concede that the recent lowering of temps may well be part of the natural climate variation. However, if it is part of natural variation then the direct logical derivation of that presumption, is that when it rises, it is also natural variation. I do not discount the possibility that increased CO2 may contribute to some warming, (but that doesn’t make me a lukewarmer) but if it is a significant contribution, the evidence would surely be readily visible – which it isn’t……..end of….

TRM
September 17, 2012 2:01 pm

Pro-Anti-Milan and just about every other point of view. I think the responses to this one article will keep me in reading material for a few weeks. This is why I come here. Now if only the whole climate debate could be so organized, scientific and civilized. Ah dare to dream 🙂
Thanks everyone

September 17, 2012 2:18 pm

Leif,
Okay, I got the spread sheet open so here ya go.
http://i122.photobucket.com/albums/o252/captdallas2/climate%20stuff/milankovicandTropicalSST.png
Without any lags, that plot is the Herbert 2010 tropical Atlantic sea surface temperature anomaly compared to the Milankovic 65 N solar forcing from the spread sheet in the post. The thermal capacity of the oceans is sufficiently large to smooth out the solar fluctuations and the internal oscillations where ice mass is not always deposited in the same region. I only did 450K years to show the more recent glacial cycles which are not created equally.
Like I said, 65N insulation provides the best match to an unreliable indicator of past climate. If you use the oceans, you would have a more reliable picture of the changes in thermal capacity.

mike g
September 17, 2012 6:51 pm

@ kadaka (KD Knoebel)
Well, covering with foil would have been a reasonably affordable prospect. Covering it with mirrors pointing at earth might get a little cost-prohibitive. Remember, earth stays fixed in the moon’s sky. But, the sun goes around the moon’s sky once each sideral period.

David Archibald
September 17, 2012 7:07 pm

dallas says:
September 17, 2012 at 2:18 pm
Great stuff. Your graph has set me off on another line of inquiry. With thanks.

September 17, 2012 7:23 pm

george e. smith says:
September 16, 2012 at 10:18 pm
So I used imprecise English, when I referred to: “””””…..So Dr Svalgaard, before I read your reference (which I will), it occurs to me, that Dr Archibald’s assertion (that 65N insolation drives interglacial onsets), is not at all inconsistent, with your suggestion that orbital changes are the key……”””””
So forget I said anything. maybe next time I will write in Maori, since my pidgen English never got my original question answered.

As I read it, Archibald and I say the same thing, because solar insolation at 65N [or any other latitude] is determined by orbital changes, so I fail to see a question here.
Lightrain says:
September 16, 2012 at 10:38 pm
temperatures start to fall, as they will for the next 50,000 years guess
They will actually rise the next 35,000 years before falling to minimum at 60,000 years.
Allan MacRae says:
September 16, 2012 at 10:45 pm
I disagree John. The satellite record, which is the only reliable scientific record of current global temperature, shows no net warming for 10-15 years.
Which is meaningless on the scale of 50,000 years.
motherofdragons says:
September 17, 2012 at 3:30 am
We just have to know now when will the next glaciation will happen and how we can prepare for it.
From now until 35,000 years there will be warming [on time scales of thousands of years]. From 35,000 until 60,000 we’ll slowly slide into the next [mild] glaciation, so no need to worry right now.
sunsettommy says:
September 17, 2012 at 6:34 am
David talked about: “It seems that insolation above 510 watts/sq metre will end a glacial period.”
Most of what David says does not make much sense.
E.g.:
Since we are BELOW that level NOW and the chart he posted shows that it stay below that level for next 50,000 years and that he labeled it as “The next glacial period” surely that is no red herring sir?
Perhaps I should have said “just plain wrong”, as clearly we at the present are not in a ‘glacial period’
dallas says:
September 17, 2012 at 2:18 pm
65N insulation provides the best match to an unreliable indicator of past climate.
This is the general consensus, so no quibble with that.

September 17, 2012 7:48 pm

David Archibald, You might want to read this, even though it is a work in progress.
http://redneckphysics.blogspot.com/2012/09/the-best-place-to-start-is-at-beginning.html
And this plot shows a little of the differing ranges of temperature fluctuation. Notice how stable the August Western Caribbean temperatures are relative to February.
http://i122.photobucket.com/albums/o252/captdallas2/climate%20stuff/whatssolargottodowithit.png
Since the Drake passage opened up enough, the Circumpolar current has been the main regulator of the deep ocean temperature. That is where most of that missing heat wandered off.
It seems that -1.9C to 0C is a pretty tight control range for the oceans. Salt water freezing and fresh ice melting temperatures doncha know. Starting with a 45S to 65S SST reference, you can come pretty close to developing a reasonable theory of the not as warm ages.

September 17, 2012 8:03 pm

It’s fair to believe that NOAA or GISS are fudging numbers, but it’s not likely that they are. In one of the links one of you pointed out for me, Watts says this is the 7th warmest year by “raw maximum temperatures.” That’s believable. But “raw maximum temperatures” only tell part of the story. The formula NOAA uses for temperature determination, which I would believe would include low temps and mean temps, needs to remain consistent with past measurements. There are always adjustments with further data but that’s true with all science.
The whole story can easily be and very likely is what NOAA says: “third warmest summer.” Also, keep in mind NOAA and GISS are non-profit. Watts and this blog are for profit. Who’s data is likely to be more whole, complete, and true?
Let me quickly add I’m not pointing a finger. Both arguments may be true in their parameters. Whether this year is 7th warmest in “maximum temperatures,” “third warmest summer,” or one of the warmest years on record as I’ve heard somewhere else, all point to the same thing: INCREASING TEMPERATURES RATHER THAN STABILITY OR COOLING.
All the measurements, even from Watts and that other “cooling” website say warming is occurring. The best thing they can argue is that it’s slowing. Is it? I don’t think so but I truly don’t know.
Let me come to my point:
1. Increasing greenhouse gases caused by man will either now or in the future mean warmer temperatures. There’s no math that changes that. How do we add greenhouse gasses to the planet and NOT HAVE TEMPERATURES GO UP? I hear the argument for the coming cyclical cooling, but there will be no glaciation. The US of A will not allow an invasion of ice from the north. Trust me on that.
2. Record low Arctic Ice Extent means things are not “status quo.” All the lowest minimums in regards to Arctic ice extent are in the last several years. Even as recently as ten years ago, Arctic Ice Minimums were double what they are now. The ice has recovered in winter, but the recoveries are lower highs and with thinner ice. Ice volume in this year’s low has dwindled to 25% of what it was 30 years ago.
The one interesting point in warming is that the highest elevations on Greenland and Antarctica are increasing mass. They rarely see temperatures above freezing and with the warmth the precipitation increases, so that’s nice. And larger Antarctic storms seem to move that floating ice around more covering a larger area, meaning a large Antarctic Ice Extent and greater reflectivity for the approaching Southern Hemisphere’s summer. Plus, that notorious Antarctic “ozone hole” actually allows heat to escape more easily, further lowering temperatures.
For me the bottom line is respect for the planet vs. disrespect for the planet. Respect for the planet is doing as little harm as possible and allowing the natural cycles. Disrespect is ignoring or denying the harm we do and justifying our destruction of normal cycles. That pains me. I believe it also pains the planet.

george e smith
September 17, 2012 8:06 pm

“””””…..Leif Svalgaard says:
September 17, 2012 at 7:23 pm
george e. smith says:
September 16, 2012 at 10:18 pm
So I used imprecise English, when I referred to: “””””…..So Dr Svalgaard, before I read your reference (which I will), it occurs to me, that Dr Archibald’s assertion (that 65N insolation drives interglacial onsets), is not at all inconsistent, with your suggestion that orbital changes are the key……”””””
So forget I said anything. maybe next time I will write in Maori, since my pidgen English never got my original question answered.
As I read it, Archibald and I say the same thing, because solar insolation at 65N [or any other latitude] is determined by orbital changes, so I fail to see a question here……”””””
“”””””…..So then that begs the question: How much of this modelling exercise is based on, and calculated from real Physics (and maybe other science disciplines), rather than simply a brazen mathematical exercise on some data stream…….”””””
Well I can see how this would NOT be considered a question; I did say my grasp of English isn’t that good. In any case it failed to elicit an answer.

davidq
September 18, 2012 12:12 am

Thanks for all the nuclear suggestions. I thought of it too, but not as bombs, but as electric power source to run a huge amount of digging and moving it.
Nuclear explosion(s) would be spectacular but unfortunately not very good for excavating a canal of any size.

bushbunny
September 18, 2012 1:23 am

One can still have cold periods. In the 1940-1960s grapes were not grown in UK, they were not long after this. We didn’t have central heating in most houses, and froze by open fires and hot water bottles with Jack Frost patterns on the inside of the windows. I don’t think you have to worry in our life times or even our children’s and grand children’s. Humans will adapt, they will have grow frost intolerant fruits and veggies under cover. It’s those seas that are frozen over like the English channel and North sea, Bering straits, and Bass strait that joined Tasmania to mainland Australia, volcanic eruptions were worst in the ice ages than now. Creed of the third millenium by Colleen McColloch read it and although predictable, I turned my electric blanket on in Summer in Oz would you believe.

kadaka (KD Knoebel)
September 18, 2012 2:00 am

From johnpetroff on September 17, 2012 at 8:03 pm: (bold added)

Also, keep in mind NOAA and GISS are non-profit. Watts and this blog are for profit. Who’s data is likely to be more whole, complete, and true?

WUWT is NOT a for-profit site. Anthony Watts is NOT a paid blogger.
For you to come here and make such slanderous accusations, well, those are FIGHTING WORDS.
Either you are SEVERELY MISTAKEN, and should apologize for speaking such nonsense out of ignorance,
Or you are a TROLL, possibly a PAID TROLL, deliberately spreading your poisonous lies.
So which is it? Are you completely mistaken, or lower than pond scum, such a lowly depraved wretch that pond scum itself would rebel against the comparison?
Come on, speak up! What are you?
Also, NOAA and GISS are technically not non-profit, they are government bureaucratic organizations, who have a vested interest in justifying their existence, their staffing, and their paychecks, for which claiming they are needed to monitor the “climate change crisis” goes right into their justifications.

Kev-in-Uk
September 18, 2012 3:09 am

johnpetroff says:
September 17, 2012 at 8:03 pm
you are still ignoring the obvious though – in that in a naturally warming world, recovering from an ice age, or the LIA (if you prefer), you would expect temps to rise?
If said temperature recovery is ongoing (of course with inherent other natural up/down variation) and you sample a ten year period in the start of that temp rise, follwed by a sample of a later 10 year period, what are you MOST LIKELY gonna see? Let’s see now, the later ten year sample are statistically more likely to be warmer than the earlier ten year sample. Agreed? (I hope so, or else this is a waste of my time (- fighting religious beliefs is not my bag!)
Next, let us remember the actual temporal limits of the measured temperature record – what?, say 150 years of temp data (we will ignore the accuracy issues!) – and an interglacial is at least 10 to 15kya long, yes? So, we have what amounts to around 1% of REAL temperature data (of which probably only 1/3 is useful or accurate!) – then consider that land surface temps are only 1/3 of the earths atmospheric temps – and the data seems rather sparse in real terms! – and the ‘team’ want to say exactly where we are on the interglacial/glacial thermal rollercoaster and that temps ‘should’ be ‘stable’? I’m afraid anyone who believes that is somewhat deluded!
The whole purpose of proxy temp reconstructions is to get a ‘feel’ for the past – but accuracy is not in any way guaranteed! Even using proxies – all as approved and rubber stamped by the IPCC, we are still not outside natural variations of an interglacial period.
mountains are being made out of molehills and the proof simply isn’t there – just loads and loads of psuedo-science speculation (and of course, some pure bulldust too!).
Clearly, as a warmist, you are convinced – but as a scientist, I am NOT!

Ulric Lyons
September 18, 2012 3:10 am

Leif Svalgaard says:
September 17, 2012 at 7:23 pm
“From now until 35,000 years there will be warming [on time scales of thousands of years]. From 35,000 until 60,000 we’ll slowly slide into the next [mild] glaciation, so no need to worry right now.”
An interglacial of 45kyrs total is a fairy tale, typically they are 10-20kyrs duration. Note between -400kyr and -390kyr ice volume increases while insolation is also increasing (Fig 1):
http://www.leif.org/EOS/2006GL027817-Milankovitch.pdf So the two are not always lock-step.
Due to the lack of proportionality of the changes of ice volume with insolation variation, it would seem that the c.100kyr “sawtooth” glaciation cycle is being impacted by insolation changes but not caused by them.

Kev-in-Uk
September 18, 2012 3:22 am

@johnpetroff
one other thing – I’d entirely agree with your last paragraph sentiment – but you, like many others are conflating green issues all together under the banner of global warming to draw attention. This is wrong and futile, indeed, turning folk like myself away from any ‘green’ support because of the clear disrespect for real science. You simply cannot fool all the people all the time. I will never support greenpeace because they have a complete no-no on nuclear power which is an absolutely stupid policy (but I bet when they are all freezing their butts off burning all the forest growth to keep warm, they might have a rethink!). Taking an emotive issue and using it for false pretence is a definate mistake made by the vast majority of ‘green’ or indeed many political movements. I pay much much less attention to ‘green’ now, than I did 10 years ago – all because of the ‘global warming’ this and ‘global warming’ that bulldust. For my money, those that jumped on the bandwagon have demonstrated a clear lack of moral or scientific integrity and deserve NO support whatsoever! So in truth, I think AGW/CAGW has really hurt the genuine environmental movement…….
.

September 18, 2012 5:08 am

Thanks Leif.
This thread suggests humanity may be totally devastated due to global cooling in the next many millennia.
I’m saying humanity may be significantly devastated due to global cooling in the next few decades.
Congratulations, you get the prize for being on-topic.
I am focusing on what matters most to humanity at this time.

September 18, 2012 5:30 am

Ulric Lyons says:
September 18, 2012 at 3:10 am
An interglacial of 45kyrs total is a fairy tale, typically they are 10-20kyrs duration.
http://www.sciencemag.org/content/297/5585/1287
“Today’s comparatively warm climate has been the exception more than the rule during the last 500,000 years or more. If recent warm periods (or interglacials) are a guide, then we may soon slip into another glacial period. But Berger and Loutre argue in their Perspective that with or without human perturbations, the current warm climate may last another 50,000 years. The reason is a minimum in the eccentricity of Earth’s orbit around the Sun.”
Allan MacRae says:
September 18, 2012 at 5:08 am
I am focusing on what matters most to humanity at this time.
Another alarmist [with opposite sign]. Climate will warm the next 35,000 years.

richardscourtney
September 18, 2012 5:30 am

johnpetroff:
Having been shown to be wrong about “accelerated warming” and “slower warming” you come back at September 17, 2012 at 8:03 pm to post a ‘straw man’ argument by asking

How do we add greenhouse gasses to the planet and NOT HAVE TEMPERATURES GO UP?

The real question is how much would temperature rise as a result of increased CO2 in the air?
Idso first reported empirical derivations of climate sensitivity for a doubling of atmospheric CO2. He used 8 different methods and reported his results in 1998. His paper can be read at
http://www.warwickhughes.com/papers/Idso_CR_1998.pdf
Idso’s “8 natural experiments” provide a “best estimate” of climate 0.37 deg.C for a doubling of CO2.
Much more recently, Lindzen&Choi analysed ERBE data from the tropics. Their paper can be read at
http://www.drroyspencer.com/Lindzen-and-Choi-GRL-2009.pdf
Its conclusions include
“For sensitivities less than 2 deg.C, the data readily distinguish different sensitivities, and ERBE data appear to demonstrate a climate sensitivity of about 0.5 deg.C which is easily distinguished from sensitivities given by models.”
And
“Finally, it should be noted that our analysis has only considered the tropics. Following Lindzen et al. [2001], allowing for sharing this tropical feedback with neutral higher latitudes could reduce the negative feedback factor by about a factor of two. This would lead to an equilibrium sensitivity that is 2/3 rather than 1/2 of the non-feedback value. This, of course, is still a small sensitivity.”
So, Lindzen& Choi find a climate sensitivity of about 0.4 deg.C which agrees with Idso’s finding of 0.37 deg. C for a doubling of atmospheric CO2 concentration.
In other words, the answer to the question “How much?” is
The rise in global temperature from a doubling of atmospheric CO2 concentration would be about 0.4 deg.C which is so small and insignificant that it would not be discernible.
Furthermore, this is proven. The logarithmic effect of increasing the atmospheric CO2 concentration on global temperature means the globe has been warmed ~80-% of its warming from a doubling of atmospheric CO2 concentration from the preindustrial level of 280 ppmv of CO2. Over the last century the globe warmed by about 0.8 deg.C. This observed rise is within the range of previous warmings of the globe and the contribution to it from additional atmospheric CO2 is not detectable.
A further doubling of atmospheric CO2 would only increase global temperature by another 0.4 deg.C.
The reasons for the trivial effect of a doubling of atmospheric CO2 concentration are
(a) the logarithmic effect of increasing the CO2 concentration on global temperature
and
(b) the net effect of feedbacks on temperature is negative.
Something too small to be detected only has an abstract existence. It does not have a real existence which has effects (discernment of its effects would be its detection). .
Richard

beng
September 18, 2012 6:16 am

****
Ulric Lyons says:
September 18, 2012 at 3:10 am
An interglacial of 45kyrs total is a fairy tale, typically they are 10-20kyrs duration.
****
The interglacial at ~420kya lasted over 30k yrs. And the Milankovitch pattern now is similar to then. Leif S, me, or anyone can’t be sure how long this interglacial will last — they’re just giving (hopefully) informed opinions. Some here have suggested in this current cycle we may stay barely above the min 65N summer insolation needed to start glaciation for the next ~60 kyrs. The fact that we’re roughly at minimum summer insolation now & we’ve recovered from the LIA (that very well might have brushed the point of initiation of glacial conditions) is encouraging.

September 18, 2012 7:22 am

David and Leif,
http://i122.photobucket.com/albums/o252/captdallas2/150kyeareventsignatureinthetropicaloceans.png
I cleaned that up a bit so now it should be a fairly good reconstruction of past tropical ocean sea surface temperature. Comparing climate to the Antarctic Ice cores is misleading at best. The CO2 temperature correlation in the ice cores is more likely related to Antarctic sea ice extent than global climate. The Milankovic Theory should have been a global climate theory not a theory of the ice ages, right church, wrong pew so to speak.

Tom in South Jersey
September 18, 2012 7:59 am

I think the issue isn’t when the next Ice Age will begin, as the point most people are missing is that despite all the hype about Anthropological Global Warming, we are indeed in an Ice Age right now. Humans have thrived because we have been blessed over the past 10,000 years to have retreating glaciers, though some still stubbornly cling to existence at the far reaches of our world. The real question is when will the ice resume it’s forward advance and start to wipe out all the apparent progress civilization has made over the years of warmer temperatures. There will come a time when we our descendants will laugh with sad irony that we feared a warming planet.
Winter is coming!! But we have to wait until April. 😉

September 18, 2012 8:01 am

Milankovitch cycles in themselves pose little threat to the current climate, but of course they had nothing to do with the LIttle Ice Age–that was the Maunder Minimum–which if repeated would freeze much of Eurasia and North America. Obviously it wasn’t severe enough to prevent recuperation with current insolation. A longer minimum might do it sometime, and there’s not much we could do to reverse it–not enough carbon in the ground. Anyway, the ice cores show no secular (or millennial) CO2/T forcing–burning carbon won’t help. Soot? That only helps when it stops snowing.
George Smith: I guess I don’t understand your question–I don’t know what modeling you’re talking about. Newton’s gravitational modeling of the solar system was pretty good, I thought.
–AGF

Tom in Florida
September 18, 2012 8:05 am

O H Dahlsveen says:
September 16, 2012 at 10:16 am
“…Come to think of it; why do sunrays still shine through orifices in stonewalls etc. (Stonehenge is one example – and there are many others) the same way as they did when they were first built in ancient times if the axial tilt of the Earth fluctuates back and forth between 22 and 24.5 degrees every 41000 years – and the globe also does a “Gyroscopic wobble” or a complete circle around it’s axis every 23000 years – which should mean that since it is, presently, mid-summer in the Northern Hemisphere in June when that hemisphere tilts towards the Sun – 11500 years (half a wobble) ago it would have been mid winter in June. – Any evidence for that in ice cores etc.?”
I believe your are referring to “precession of the equinoxes”. The term summer and winter are fixed to the time of the year when the axis is tilting towards (summer) or away (winter) from the Sun. Northern hemisphere summer solstice always happens in June and NH winter solstice always happens in December (according to our current calendar). However, precession changes the place in the orbit that these solstices occur. Currently NH winter solstice is at perihelion, when Earth is closest to the Sun. 11,500 years ago NH summer solstice was at perihelion. As an aside, obliquity at that time was about maximum (24.5 degrees) so is it any wonder why the NH ice sheets started melting as Earth approached that condition?

September 18, 2012 10:25 am

To kadaka:
According to the blog, Watts Up is “…the world’s most viewed climate website.” I’m presuming Watts is the sole owner if the site. All that advertising you see, he gets paid for. My guess, and this is a pure guess, is he earns 7 figures. Isn’t that what “the most viewed climate website” would pull in?
That is paid. Watts doesn’t publish his salary. Rush Limbaugh does. Rush earns $50 million per year being a paid propagandist. The truth is free by the way. “Spin” or “propaganda” needs to be paid for.
For Anthony Watts, the more “no global warming” sentiment he stirs up, the more he gets paid in advertising. That’s the simple reality of our world. I’m not being critical. I’m just saying be knowledgeable and understand that.
As for me, I am an unpaid observer. And I look at the data you posted, that data Anthony posts, the information the government agencies post and they don’t post theirs “for profit” or for “advertising dollars,” they simply post the numbers they see, and everybody’s numbers say the same thing: we are in a warm period that does fluctuate and is at present getting warmer.
I hear the argument “it’s natural.” I hear the argument “man’s effects are zero to inconsequential.” I’m just asking “Are they?”
And I’m asking you skeptics, do you ever listen to the other side? Are you observers or blind little sheep?
I am rooting for cooling. I was ecstatic when the Bering Sea set a record Ice Extent this last spring. I was happy the Arctic as a whole approached what could be called “normal” or “average” Ice Extent last spring. I’m happy Antarctica is very near it’s record now and am hoping it manages a new one.
BUT.. we’ve just set a record low summer Minimum Ice Extent in the Northern Hemisphere by blowing out the old record. And that’s by any organization’s standards of measurement.
How come you skeptics don’t talk about that and say “If we’re cooling, why did we just set a record low Arctic Ice Extent?” “If we’re cooling or stable, why are temperatures still climbing?” “If temperatures are climbing, can we genuinely say they are static or cooling?”
And I hear the argument “Cooling is just around the corner.” Is it? We’ll find out won’t we.
I do agree with the post “it’s nice to be warm.” It is. It just MAY NOT

September 18, 2012 10:40 am

To finish my thought.. It just may not be nice to deal with the consequences of warmth. Of which we don’t fully understand. And conversely if cooling begins, we’re not completely understanding of those consequences. But there’s time to explore that if it occurs.
I’m such an unprofessional at this I sent my last message before I completed it. I didn’t hit Post Comment so I have no idea how I did it.
I’m thankful for the forum and thankful for the debate. I am skeptical however that minds will be influenced, but it’s fun to try.

D Boehm
September 18, 2012 10:55 am

johnpetroff,
Anthony has mentioned that he earns a few hundred dolars a month from ads. That’s not much money for all the work he puts in. Most of the revenue goes to WordPress, which selects and posts the ads.
You write: “I’m asking you skeptics, do you ever listen to the other side? Are you observers or blind little sheep?” That is psychological projection. You sound as silly there as you do assuming that WUWT makes millions of dollars. Your connection with the real world is very tenuous.
The real problem is that the alarmist crowd refuses to listen to scientific skeptics. Alarmist minds are already made up, and closed tight.
For example: I have asked for years for someone to post verifiable, testable, measurable scientific evidence of AGW. But no one has ever posted any measurable evidence. The conclusion is that there is no such evidence for AGW [or for the even more preposterous CAGW].
That does not mean AGW does not exist. But without evidence, AGW is only a conjecture. It is not a hypothesis, and it is certainly not a theory. It is an opinion based on radiative physics — which is not the same thing as AGW.
The AGW conjecture is based primarily on rising CO2. But global warming has been stalled for fifteen years, so your claim that the planet is still warming is false. Temperatures are not “still climbing”. And your fright over Arctic ice is based on the misconception that what is being observed now has never happened before. But it has, and during times when CO2 was much lower.
I suggest you re-think your entire comment. It is illogical, and your supposed ‘facts’ are plain wrong. All scientific skeptics are saying is: “Show me”. But the alarmist crowd has no evidence of AGW. Doesn’t that make you wonder if you’re swallowing the AGW claim hook, line and sinker?
Demand evidence! Because without scientific evidence, all you’ve got is opinion. Belief. That is not convincing enough. We need empirical, testable, verifiable, measurement-based evidence confirming AGW. But there is none.

DavidG
September 18, 2012 11:00 am

Leif objected to my saying that neither he nor Axelrod ‘knows’ when the next ice age will be and I stand by that, neither of you do *know*, you are making educated guesses which don’t meet the bar of fact at this point.

richardscourtney
September 18, 2012 11:09 am

johnpetroff:
You say your two posts at September 18, 2012 at 10:40 am and September 18, 2012 at 10:25 am should be considered together. You conclude the latter saying

I’m thankful for the forum and thankful for the debate. I am skeptical however that minds will be influenced, but it’s fun to try.

I don’t believe you!
Your provided a sequence of posts which made a series of blatantly untrue assertions about warming. As each of your falsehoods was refuted you retreated back from “acceleration” to “slower warming” to “How much warming?” to nothing.
Then you started attempting to defame our host, Anthony Watts.
Importantly, your posts have presented nothing except lies and smears which do not pertain to the subject of this thread in any way.
Clearly, you are a troll attempting to disrupt this thread by posting lies and defamations: you have done nothing else
Discuss the subject of the thread or go away.
Richard

Jim G
September 18, 2012 12:37 pm

johnpetroff:
“The truth is free by the way. “Spin” or “propaganda” needs to be paid for.”
And where, pray tell, does one find this “free truth”? CBS, NBC, PBS, newspapers, Church (pick your religion), The Web, politicians, the government? What a ridiculous statement! That “truth” was plucked from your anal orifice. No information is free, other than possibly word of mouth, and as they say, you get what you pay for, or sometimes what someone else has payed for. Very little in this world does not have a cost attached in one way or another. That cost may be acting upon bad information.

Jim G
September 18, 2012 12:50 pm

DavidG says:
September 18, 2012 at 11:00 am
“Leif objected to my saying that neither he nor Axelrod ‘knows’ when the next ice age will be and I stand by that, neither of you do *know*, you are making educated guesses which don’t meet the bar of fact at this point.”
You are 100% correct. Leif is very knowledgeable in his field and mostly logical though tends to accept theory as fact and state probables as fact. In both cases they may be well substantiated by data, but are not fact. I have argued this with him on occasion. Such discussions with him can take on marathon proportions, though tend to be interesting. Sorry but I don’t know Axelrod.
We, as skeptics, need to stay away from being overly accepting of theories as fact,or fall into the same box as the warmist crowd. I continue to believe that true scientists think out of the box even when consensus is against them.

September 18, 2012 1:21 pm

johnpetroff says:
September 18, 2012 at 10:40 am
I’m thankful for the forum and thankful for the debate. I am skeptical however that minds will be influenced, but it’s fun to try.
=======================================================================
Patience now, John is a child. He thinks he has taught us something. He confesses to ignorance, yet attempts to teach us, thinking we are even more ignorant than he.
John, you have been taught by morons, the most intelligent of which is dumber than the dumbest posters on this thread. Do you think we don’t know Arctic ice is shrinking? WUWT has a site monitoriing it. You probably think polar bears are in trouble. All 50,000 of them. The bears of North America are the safest big predators on the planet, including Ursus maritimus. You wanna know a species that’s in trouble? The Siberian tiger is one, maybe a thousand of them left. Panda’s are in short supply too. Everywhere people go, the predators disappear. Polar bears don’t have much competition with humans.
Humans now, their population continues to grow; not danger there. Especially not from Global Warming. Maybe you think rising sea level is a problem (since you obviously believe every scary fairy tale you’ve been told). How fast do you think it is rising? A foot a year? Three feet per year? An inch a year? How fast? How dangerous is it. Try and inch in ten years–that’s the truth. Do you think that’s dangerous? The quacks you trust in would have you believe it is, and that it’s growing and bound to grow more (which it isn’t).
These Milankovitch cycles discussed here involve variation in insolation (at the top of the atmosphere) of 100W/m^2. Do you have any idea how much energy is attributed to GHG’s? About 1.6W/m. Do you know what an order of magnitude is? Do you understand that taking clouds into account, M cycles cause radiation variability of an order and a half of magnitude more than GHG’s? That is to say, it takes about 30 times as much energy to melt the ice as is attributed to green house warming. And you want us to share in your scary Global Warming superstition!
If you want to learn a little about climate history as learned from ice cores, go here:
http://upload.wikimedia.org/wikipedia/commons/7/77/Vostok_420ky_4curves_insolation.jpg
You’ll see that we are currently in the longest interstadial of the last 400,000 years, and we could very well be in for a new ice age.
Now you seem to think that warming is bad, and cooling is good. Would you tell us why you think so? Have you ever heard of the Little Ice Age or the Medieval Warm Period? Which do you think brought us the most plagues? Or famine? Or drought? What makes you think that current Arctic melting is something new? How do you think medieval explorers mapped out the Arctic coast of Siberia? How long do you think satellites have been monitoring the ice? How do you think polar bears survived the MWP? How well do you think they fared during the LIA? Through what thickness of ice do you think a seal can maintain a breathing hole? Do you think polar bears can live on thick ice?
So I hope you get an inkling of an idea how you have been duped by the worst excuse for science that the modern world has seen. It makes the American Association of Petroleum Geologists look enlightened by comparison, even when they officially pooh-poohed Continental Drift for decades. You have suckered for the most outrageous propaganda that was ever spouted in the name of science. You need to forget everything you have learned and start over again. You need to learn how to think critically. That’s why we are gathered here at WUWT. –AGF

September 18, 2012 1:56 pm

D Boehm.. does Anthony Watts have a separate full time job that also allows him to blog full-time here? Because i need a job like that. If no, then he makes a lot more than a couple of hundred dollars a month. You’re saying he’s earning a minimal income, I’m guessing he’s making a very good income. That’s a very good guess. One way or another he’s earning a living from skepticism.
Everyone doing studies on global temperatures are saying temperatures are rising… including the “skeptic” websites, and you say “no one has posted measurable evidence?” I posted a whole page full of graphs and websites, both main stream science and skeptics. Were you unable to click on any of them? Any of them will have mountains of data.
Speaking of open minds.. I did come here. I looked at data representing “cooling” and “stability”. The data still showed increasing temperatures but were misread by “skeptics.” I pointed that out for several of you. And even after my pointing it out you’re still misreading it and arguing about it. How should that be perceived by an impartial observer? As intelligent or sane?
Speaking of open mindedness, are your minds so open that you can’t review ANY scientific evidence for warming? Is that how open my mind should be in regards to skeptics?
Then you resort to hate speech and insults. Do you honestly have no comprehension of why the scientific community doesn’t take you seriously?

September 18, 2012 2:18 pm

Leif, I really hope you are correct. especially about warming in the next few decades.
Let’s discuss in another few years, by 2020 at the latest.

D Boehm
September 18, 2012 2:26 pm

johnpetoff,
What “hate speech and insults”? You called us “blind little sheep”, remember? If you can’t take the heat…
And may I remind you that you wrote: “I’m presuming Watts is the sole owner if the site. All that advertising you see, he gets paid for. My guess, and this is a pure guess, is he earns 7 figures.”
See, you specifically referred to advertising, not to a paying job. Anthony can speak for himself, but if you had read the most recent PBS articles you would have found out that Anthony runs a successful technology company. Anyway, it is really none of your business, is it? I suppose your green-eyed envy is intended to distract from the plain fact that you have no credible AGW arguments.
Next, all honest scientists are scientific skeptics. That leaves out the alarmist scientists, no? They are in it for the money, for the travel, for the status, for the perks, for the notoriety, and for other motivations that have nothing to do with scientific truth.
You referred to some graphs and websites, after I explained to you that those are not scientific evidence. Evidence consists of testable, falsifiable data and empirical scientific observations. You only cut and pasted opinions.
When/if you can directly connect global temperature with human CO2 emissions, we will all sit up straight and pay attention. But so far, no one has been able to do that. That’s why the debate over the climate sensitivity number is never settled. There is no measurable evidence showing that X amount of CO2 causes Y temperature rise. There are no such measurements. There are only measurements showing that changes in CO2 follow changes in temperature. You have cause and effect reversed, so you reach the wrong conclusions.
There may be AGW. But the evidence is lacking. And the fact that global warming stalls for decades at a time, while CO2 rises steadily, puts the onus on the alarmist cult to show that CO2=AGW. Just showing an intermittent correlation is not enough. Because when the scientific method is employed, AGW becomes nothing more than an evidence-free conjecture.

richardscourtney
September 18, 2012 2:53 pm

Friends:
Please stop feeding the troll.
Richard