Public Release: 19-Dec-2018
The quest to discover what drove the last, long-term global climate shift on Earth, which took place around a million years ago, has taken a new, revealing twist.
A team of researchers led by Dr Sev Kender from the University of Exeter, have found a fascinating new insight into the causes of the Mid-Pleistocene Transition (MPT) – the phenomenon whereby the planet experienced longer, intensified cycles of extreme cold conditions.
While the causes of the MPT are not fully known, one of the most prominent theories suggests it may have been driven by reductions in glacial CO2 emissions.
Now, Dr Kender and his team have discovered that the closure of the Bering Strait during this period due to glaciation could have led the North Pacific to become stratified – or divided into distinct layers – causing CO2 to be removed from the atmosphere. This would, they suggest, have caused global cooling.
The team believe the latest discovery could provide a pivotal new understanding of how the MPT occurred, but also give a fresh insight into the driving factors behind global climate changes.
The research is published in Nature Communications on December 19th 2018.
Dr Kender, a co-author on the study from the Camborne School of Mines, based at the University of Exeter’s Penryn Campus in Cornwall said: “The subarctic North Pacific is composed of some of the oldest water on Earth, which has been separated from the atmosphere for such a long time that a high concentration of dissolved CO2 has built up at depth. When this water upwells to the surface, some of the CO2 is released. This is thought to be an important process in geological time, causing some of the global warming that followed past glaciations.
“We took deep sediment cores from the bottom of the Bering Sea that gave us an archive of the history of the region. By studying the chemistry of sediment and fossil shells from marine protists called foraminifera, we reconstructed plankton productivity, and surface and bottom water masses. We were also able to better date the sediments so that we could compare changes in the Bering Sea to other global changes at that time.
“We discovered that the Bering Sea region became more stratified during the MPT with an expanded intermediate-depth watermass, such that one of the important contributors to global warming – the upwelling of the subarctic North Pacific – was effectively curtailed.”
The Earth’s climate has always been subjected to significant changes, and over the past 600,000 years and more it has commonly oscillated between warm periods, similar today, and colder, ‘glacial’ periods when large swathes of continents are blanketed under several kilometres of ice.
These regular, natural changes in the Earth’s climate are governed by changes in how the Earth orbits around the sun, and variations in the tilt of its axis caused by gravitational interactions with other planets.
These changes, known as orbital cycles, can affect how solar energy is dispersed across the planet. Some orbital cycles can, therefore, lead to colder summers in the Northern Hemisphere which can trigger the start of glaciations, while later cycles can bring warmer summers, causing the ice to melt.,
These cycles can be influenced by a host of factors that can amplify their effect. One of which is CO2 levels in the atmosphere.
As the MPT occurred during a period when there were no apparent changes in the nature of the orbit cycles, scientists have long been attempting to discover what drove the changes to take place.
For this research, Dr Kender and his team drilled for deep-sea sediment in the Bering Sea, in conjunction with the International Ocean Discovery Program, and measured the chemistry of the fossil shells and sediments.
The team were able to create a detailed reconstruction of oceanic water masses through time – and found that the closure of the Baring Strait caused the subarctic North Pacific became stratified during this period of glaciation.
This stratification, that argue, would have removed CO2 from the atmosphere and caused global cooling.
Dr Kender added: “Today much of the cold water produced by sea ice action flows northward into the Arctic Ocean through the Bering Strait. As glaciers grew and sea levels fell around 1 million years ago, the Bering Strait would have closed, retaining colder water within the Bering Sea. This expanded watermass appears to have stifled the upwelling of deep CO2-rich water and allowed the ocean to sequester more CO2 out of the atmosphere. The associated cooling effect would have changed the sensitivity of Earth to orbital cycles, causing colder and longer glaciations that characterise climate ever since.
“Our findings highlight the importance of understanding present and future changes to the high latitude oceans, as these regions are so important for long term sequestration or release of atmospheric CO2.”
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The magic molecule.
The magic molecule that keeps laying the golden egg for scientists and universities that get the right results.
While the causes of the MPT are not fully known, [ aka we have no idea at all ] one of the most prominent theories [ aka hypotheses ] suggests it may { or may not } have been driven by reductions in glacial CO2 emissions.
These guys must lay awake a night thinking: ” what’s left that we have not managed to link to CO2 yet? “
Exactly! Its so bloody predictable.
One of the most prominent Theories (aka COWAG Completely Outrageous Wild Arse Guess) it is like a SWAG only not sophisticated.
Don’t volcanos spew out a lot of methane and water vapor, too? How did they measure the methane and water vapor changes in the atmosphere which would be more damning to climate than CO2?
IPCC official, Ottmar Edenhofer, speaking in November 2010: “But one must say clearly that we redistribute, de facto, the world’s wealth by climate policy. … one has to free oneself from the illusion that international climate policy is environmental policy. Instead, climate change policy is about how we redistribute, de facto, the world’s wealth…” “This has almost nothing to do with environmental policy, anymore.” http://www.nzzDOTch/aktuell/startseite/klimapolitik-verteilt-das-weltvermoegen-neu-1.8373227
2Jan2015 At a news conference [22Jan2015] in Brussels, Christiana Figueres, executive secretary of U.N.’s Framework be adopted Convention on Climate Change, admitted that the goal of environmental activists is not to save the world from ecological calamity but to destroy capitalism. “This is the first time in the history of mankind that we are setting ourselves the task of intentionally, within a defined period of time, to change the economic development model that has been reigning for at least 150 years, since the Industrial Revolution,” she said . Referring to a new international treaty environmentalists hope will at the Paris climate change conference later this year, she added: “This is probably the most difficult task we have ever given ourselves, which is to intentionally transform the economic development model for the first time in human history.”
Investor’s Business Daily: http://news.investors DOTcom/ibd-editorials/021015-738779-climate-change-scare-tool-to-destroy-capitalism.htm#ixzz3RXh5Tujn
OK good people, let’s say this again, S-L-O-W-L-Y:
CO2 IS NOT THE CONTROL KNOB OF GLOBAL CLIMATE!
This hypothesis is demonstrated to be false:
1) If increasing atmospheric CO2 has any significant effect on global warming, it is minor and net-beneficial – when we attribute ALL warming to increasing CO2 we obtain this incontrovertible result.
2) The only evidence in the ice core record AND in the modern data record is that CO2 trends lag global temperature trends – it’s a bit complicated, but rest assured that the future cannot cause the past.
“INCREASING ATMOSPHERIC CO2 HAS CAUSED A STATISTICALLY-SIGNIFICANT INCREASE IN EXTREME ACADEMIC STUPIDITY.”
– Allan MacRae 🙂
This paper should be considered some proof that not only is CO2 a minor component to whatever the equation is for earth’s climate, but it should shed some light on that whatever causes either warming or cooling, CO2’s contribution is a minor one.
The statement (grammar corrected), “… and found that the closure of the Baring Strait caused the subarctic North Pacific to become stratified during this period of glaciation.
This stratification, they argue, would have removed CO2 from the atmosphere and caused global cooling.”
Here is the overt obvious problem. If the cooling was causing the closing of the Baring Strait and subsequently, CO2 was sequestered, then it was not the closing of the Baring Strait and the subsequent sequestering of the CO2 that was causing the cooling. So, something else must have been causing the cooling, not the removal of CO2 from the atmosphere.
Granted, they may be arguing that the cooling was extended by this effect. Yet they offer no explanation of why the cooling was occurring in the first place, and actually argue that it could not have been from orbital causes.
So, something other than CO2, and orbital changes caused the earth to cool during this period.
What was it?
This does look like an attempt to attribute warming to CO2 levels only.
More to the point, I think it assumes it.
It’s settled science.
They had a vote!
Dr. Einstein, here are 1000 German scientists who reject your “Jewish science”.
Dr. Galileo, the science is settled! The College of Cardinals set up a committee and voted!
‘It’s settled science.’
Even though they reckon they’ve discovered something new about the planet? These plant food obsessives don’t do irony well.
Easy to come to the magic conclusion if you know the answer you seek.
Well we have been instructed that CO2 is the control knob for the climate.
It was in all the papers . . .
No Richard, the agw dogma holds that there is only one prime suspect in the role of puppet master of the climate, pulling ALL the strings, and that is manmade CO2 emissions.
Al Gore descended from The Hill and presented the digital tablet of peer-reviewed climate consensus called ‘An Inconvenient Truth’ which instructed all Gaia’s children in following the (numerous) climate commandments, the chief one of which is that Thou Shalt Deliver Unto The UN A Tithe In The Amount Of $100 Billion Per Annum.
It wasn’t the maid, or the butler, or the mailman, or the milkman; it must have been the husband.
“No Richard, the agw dogma holds that there is only one prime suspect in the role of puppet master of the climate, pulling ALL the strings, and that is manmade CO2 emissions.”
No, Mr., this is what you’ve been led to believe by those who wish to fool their followers. There is no such “agw dogma.”
Papers like this one are the reasons for it, Kristi. Mind boggling how you can dismiss evidence that is right in front of you.
Seems like a concerted effort to glamorize CO2 as the world’s top villain
Mann is the only climate knob
I saw what you did there. Good one.
Nah he is only one knob among a group of them.
Kristi if CO2 is not the control knob, why is all the civilization- destroying expenditures of Trillions to be spent. We HAVE been told it is CO2! A little late to be telling us its shifted away from this importance. And when they shift it somewhere else will you be jumping in with such certainty to defend the emendment? Com’on kristi, you know yours and Richards waffle is a walkback.
What is the RESOLUTION of the Temperature data in contrast to the CO2 data, proxy or not?
Salute!
I guess there’s no heat/cool transfer from the water itself, huh?
But since more of the evil gas is absorbed in colder water, then….then… more released in warm water … then…then…. yeah, that’s the ticket!
Less of the evil gas and less greenhouse effect and we get continental glaciers. When the water warms we get rising columns of warm water that release the gas and we get warmer I like it.
Gums sends…
Nothing to with Ocean Currents then, just CO2.
Wow who would ahve guessed?
oh for God’s sake…….
Latitude
I was struggling for an expression as effective as yours but mine were unpublishable.
“When this water upwells to the surface, some of the CO2 is released. This is thought to be an important process in geological time, causing some of the global warming that followed past glaciations.
FFS!
They are talking about such a small area of “ocean”….even if what they think did happen…it would have made no difference
Do they find a real and believable cause for a change in climate….. And then they blame it all on CO2 once again!
Another crock.
“global climate shift” as defined how, on what basis, and by who, I wonder? Seems more than a little subjective to me.
The shift from 40 Kyr cycles to 110 Kyr glacial cycles has been an on-going question. Many proposed answers. This just adds one more to the list.
My explanation of their explanation:
Climatist’s linear thinking frequently is confounded in our non-linear physical world.
When your favorite tool is a hammer, everything looks like a nail.
Or a skull.
Every time some new study comes out naming CO2 as the cause for ANY climate change, my eyes glaze over. For Pete’s sake, a single CO2 molecule per 10,000 other gas molecules cannot ‘control’ anything. Logic says that. It’s time to start using logic, and perform studies that determine causes of things, rather than going in with the answer (CO2), then writing the study to back up the (wrong) assumption.
John, I usually jump in here and point out that a single molecule of CO2 per 10,000 (it’s actually ~one per 2500 but even granting your point) this ‘meagre’ amount is capable of generating and sustaining the mighty biosphere, the most visible and distinguishing characteristic of the planet! So please dig deeper to discredit this heavy lifter! It makes sceptics look bad to argue how puny it is.
Gaey Pearce, yor argument is not persuasive. If you increase CO2 from 300 to 400 ppm you have increased the atmosphericc portion by .01% but from a plant’s perspective you have increased its food source by 33%.
Gary Pearse is correct. There is in fact a CO2 effect, which has been shown to be logarithmic. He is not saying it is a control knob however, there is some affect in that CO2 slows the lapse rate of energy leaving our system as the molecule bends while it holds on and then releases the energy of specific wavelengths.
Gary. When lifting heavy goods its always important to bend your knees! The ratio of one in ten thousand of C02 applies to the anthropogenic component. Not complicated. Keep up the lifting but open your eyes. Eoin
Old man, Eoin, Gents Im one of the more stalwart sceptics here but look at the logic! If you are arguing how puny the molecule is, my point is obvious. That 0.01% more greened the planet by more than 15% and growing. Tell me you ate not amazed at the heavy lift. It is the real number 1 wonder of the world.
Now if your argument is it is not a greenhouse gas, say so. You will be in a small minority of scientifically literate sceptics.
Gary … I”ll give you the heavy lifting …. giving you credit that CO2 is an amazing molecule. Using your own reasoning, CO2 induced global greening vs Global Warming. Given that both mechanisms are allegedly “global”, when you compare the “MAPS” of the two phenomenon, you will find that CO2 does indeed “green” the globe. It greens existing plant life everywhere, and expands plant life into areas where there is none. In contrast, you will not find a similar map for Global Warming. Practically ALL of the global warming is in the Arctic.
As such, it is supported by the evidence that the mechanism for Global Greening, ie., CO2 Fertilization is of sufficient importance that it has an impact Globally. In contrast, the evidence suggests that the mechanism for CO2 induced Global Warming is NOT sufficient to significantly contribute to increased temperature on a global scale.
As far as this paper goes, it is consistent with the above. The paper states that Glaciation results in the BS to be closed …. i.e., global cooling CAUSES the BS to close, which in turn results in a minor sequestration of CO2 into in subarctic waters. It is not lost on intelligent readers that it was Global Cooling that caused the decrease in CO2, not the other way around. And as previously noted by others, this is consistent in ALL CO2 temp relationships.
The correct order of things is: Temp > CO2 > Greening.
The incorrect order of things is: CO2 > Temp and Greening.
The real data don’t lie.
Gary Pearse: “Now if your argument is it [CO2] is not a greenhouse gas, say so. You will be in a small minority of scientifically literate sceptics.”
Is that a subtle appeal to authority? You seem to imply that the vast majority of ‘scientifically literate sceptics’ would argue that CO2 is a greenhouse gas. Therefore we should all believe in a ‘greenhouse gas’ property that can’t be measured. You’ll likely respond that it has been measured, somehow, somewhere. But it’s not being measured now, why is that? It hasn’t been measured on Mars where the atmosphere is 95% CO2, why is that?
I want to see charts of various locations. We can compare the barometric pressures from various locations because we measure it at various locations. Now, I want to compare the measurements of this ‘greenhouse gas’ property between Miami, Florida and Denver, Colorado. There’s a mile of Earth’s most dense atmosphere differentiating these two locations. Miami must be receiving much more ‘greenhouse gas’ since there’s more atmosphere above it. But I can’t compare these charts, because there are no charts! I want to form an answer as to why Miami has never recorded a 100F temperature while Denver typically has several per year.
If it can’t be measured, how do you know it exists?
John,
Here is a simple question? Would you be prepared to ingest one molecule of botulinum toxin per
10000 by bodyweight? Surely if one molecule per 10, 000 can’t have an effect on climate one molecule
per 10000 can’t be lethal? Alternatively if you accept that botulinum toxin is lethal at levels of one part in 10^12 then other molecules can have similarly large effects at concentrations a billion times higher.
Classic non sequitur.
Following your reasoning. Put 1 Islamic per 10,000 Christians make World worse?
Mariano, I see no reason to slander a whole group of people in order to make a point.
Would we tolerate the comment if Islamic was replaced with Jew or Italian?
Mods?
No but I am perfectly willing to breathe air with 4000 ppm CO2 instead of 400.
The Navy controls CO2 air concentration to approx. 4000 ppm in their nuclear subs without any effect on crew performance. It does slow down the burn rate if a fire breaks out…
Carbon Dioxide is not a toxin except in high concentrations. 1 molecule per 10,000, or 400 per- are not high concentrations.
No, but the air in your lungs varies between about 15,000 and 50,000 ppm CO, and we haven’t managed to poison ourselves yet…..
John:
You have the classic misconception of the GHE in the atmosphere.
Should the concentration of CO2 rise 1ppm, as you say 1 v 10000 molecules.
Then how many of them would you think a single photon of LWIR strike on it’s exit to space?
More pertinently to a height of ~8km (-18C level) where we find the Earth’s effective radiative cooling level.
And when it does it will emit said LWIR and a higher, colder and much less efficient way to space.
It is the PATH LENGTH that matters not absolute concentration.
Now we’ve added an extra 40%+ since pre-industrial times and that’s a LOT of extra molecules that are able to absorb and attenuate the Earth’s cooling to space.
Sorry but this is empirical radiative science and with which our military entrust certain airborne defence mechanisms.
It’s been know of since Tyndall and Arrhenius going back to 1859.
And here is an experiment that observed the effect for 10 years ….
https://phys.org/news/2015-02-carbon-dioxide-greenhouse-effect.html
Meanwhile folks here often trumpet the “magic” molecule for “greening” the planet.
So it’s “magical” enough to do that (a surface effect), but not cause ~1C in planetary warming since 1880? (sarc)
I’d say that that is a selective use of the word “magical”, and only used by those that are ignorant of the (empirical) science.
The problem with your theory is that we had very little industrial production of CO2 in 1880. Coal was being used, but on a tiny scale compared to 100 years later. There was no oil industry. No natural gas industry. Even the IPCC can’t find enough CO2 production by humans to have an effect on the climate, until after 1950. But there was warming. It was caused by “natural variations in the climate”. And there is a mountain of evidence to show that natural variations have occurred in the past. They are occurring in the present, and will occur in the future. And it is a logical game of Twister to blame them on CO2 now, but not then.
Why doesn’t the temperature of the Earth go up in lock-step with the increase in CO2?
The models show no reasons for multi-decade temperature variations. There was no reason for warmth in the first half of the twentieth century. No reason for cooling from 1950-1980. No reason for a pause in warming this century.
Water vapor is the primary GHG. And it is ubiquitous on this planet, except in the deserts and the polar regions. And they are seeing a slightly warmer low temperature. Hardly the Apocalypse the Prophets of Doom, were predicting.
The tipping point did not tip. Nor will it ever tip. This has been an effort by the UN to secure a method of cash-flow to entrench their political power, so they would not have to be dependent on donations from member nations. It morphed like a metastatic cancer into academia and government research, which also is fond of secure cash flows for hired gun research. And the Leftists who were exposed by the failure of the USSR, jumped on board because a global government could crush freedom, better than Marxist countries competing with free countries ever could.
The problem is the oceans don’t care whether you get your grants or not. And they have the final say in whether a longer PATH LENGTH leads to chaos. So far they are laughing at your puny intellectual masturbation, data manipulations, and excuse construction when measurements do not jive with model projections. And the oceans have a long history of laughing at fools that think they are Masters of the Earth.
I could believe this to be correct if it were not for their use of could.
Was there a drop in CO2 levels when everyone was worrying about global cooling back in the 70’s?
Let me know when CO2 can start mowing my lawn.
So what caused the glaciation of the Bearing Sea in the first place.
Sounds like another jump to a conclusion.
Bingo.
This should be filed under;”The Stupid it Burns”.
mikebartnz
This is easy to explain. The cause is the effect afterwards created. It is a self-exciting generator, a climatic Lodestone, attracting, then aligning, the minds of (especially) men.
It requires an absurdly high equilibrium climate sensitivity (ECS) to CO2 but that never moderated any speculations to date, so why stop now.
They have to argue this very carefully. If they say it is too sensitive to CO2, they will propose a scenario in which runaway temperature rise and fall is inevitable, something contradicted by research evidence. If they propose it is too low, such a small perturbing region cannot influence the planet. Alternatively, they might accidently show that the current rise in CO2 is largely caused by deep ocean water rising to the surface. These are all scary possibilities – in the sense they would undermine the cherished position of humans in control of the weather, as they undoubtedly were in the 1620’s via incantations and spells.
So, if one can’t find any “apparent changes in the orbit cycles” climate shifts at other times have to be a result of changes in CO2 levels? There’s nothing else to consider? These guys have no imagination!
This is a strange study, in that it proposes that a glacial period is made COLDER by the lowering of CO2. Note that the text describes the closure of the Bering Strait. Only 2’ways to do that…lowered sea level or ice dam, or both simultaneously.
I wish there was a link to the actual report, to know what they determined. Maybe I can find it.
https://www.nature.com/articles/s41467-018-07828-0
Found it.
https://www.nature.com/articles/s41467-018-07828-0
The Trudeau liberal government in Canada is imposing a carbon tax in a couple of days. The control knob will be turned down, Trudeau saving the world. Ought to be worth a noble peace prize, what ever that is worth these days.
Not as much as Nobel nc.
The Nobel Peace Prize continues to have monetary worth, but long ago deteriorated in worth associated with accomplishments that advanced science or improve human existence on Earth.
The decline in the prestige of the Nobel Peace Prize awards began with the co-award to Henry Kissinger in 1973, continued with the co-award to Yasser Arafat in 1994, and accelerated downward with co-awards awards to Al Gore and the IPCC in 2007 and the single award to Barack Obama in 2009.
You know, I’ll never forget that Obama received the Nobel Peace Prize for his great work in . . . uhhh . . . wait a minute, it will come to me . . . for . . . uhhh . . . was it community organizing, no, that wasn’t it . . . for . . . errr . . .
Clogging the Bering Strait might have caused a temporal stratification and a kind of temporal lid. But then it sees that quite a lot of woodo hydrography has to be operating to support the conclusions in the paper. Freesing ice on the Bering shelf would send some cold high saline water to the depths and the sinking cold water from the Nort Atlantic and around Antarctica would still go on and make great pushes for upwelling elsewhere in the North Pacific. Just need to have that occurring south of the shelf and the spread, probably quite some water masses along the American continent due to Coriolis (Earths rotation) and thus ample options for degassing CO2 as the water gets warmer on its way to the south. Should check out for the fossil record along the expected pathways of these anticipated currents.
The main trick of attribution of all historic climate change to CO2 is a simple inversion of cause and effect. Due to ocean gas solubility and temperature, CO2 concentration in the atmosphere follows changes in global temperature with a time delay. This is fudged and twisted into CO2 causation.
The historian Anthony Beevor identified inversion of cause and effect as a general propaganda strategy used by violent totalitarian regimes such as the Third Reich. To quote:
To prove the so-called inferiority of the conquered nations, Hitler inverted, in a characteristic move, cause and effect. He began a ruthless policy of terror, starving the captured people, humiliating them, killing them, and imprisoning them in labor and concentration camps. This mistreatment dehumanized the victims, often reducing them to animal-like behavior in their hopeless struggle to survive. Hitler then launched a propaganda campaign that “demonstrated” the behavior of the conquered people was abject and animalistic, to prove that they were inferior to the “civilized” German race.
The WWII historian Antony Beevor documents in his magnificent book, The Second World War (New York, Little, Brown & Company, 2012) that, following Hitler’s invasion of the Soviet Union, “By February 1942, 60 percent of the 3.5 million Red Army prisoners had died of starvation, exposure or disease” (418). A quarter of the population of Belarus perished due to the Germans’ savage oppression.
(Sorry Godwin – again!)
Assuming this logic is correct we can conclude that CO2 flows are completely unknowable, that long ago.
They have looked at the Bering Sea. But what about the lakes formed by mudflats that disappeared within a few thousand years?
Or the inland seas caused by rainfall in a catchment area that suddenly spit in half and drained as expected after a mere half millennium?
If CO2 works as this paper assumes then we cannot draw any conclusions for any hypothesis as the action of CO2 would be more variable than the resolution of the measurements.
[[Today much of the cold water produced by sea ice action flows northward into the Arctic Ocean through the Bering Strait. As glaciers grew and sea levels fell around 1 million years ago, the Bering Strait would have closed, retaining colder water within the Bering Sea.]]
I think he meant “Southward from” rather than “northward into]]
Milankovitch driven glacial-interglacial cycling over the last 2-3 million years represents “flicker”. This is a chaotic phenomenon occurring at the transition of a system from one state / attractor to another. On a scale of tens of millions of years Earth is moving into a long deep glaciation similar to the preCambrian ones such as the Cryogenian and Marinoan or Sturtian.
Here’s a paper that describes flicker during state transition:
Flickering as an early warning signal
Dakos V, van Nes EH, Scheffer M. Flickering as an early warning signal. Theoretical Ecology. 2013 Aug 1;6(3):309-17.
Abstract
Most work on generic early warning signals for critical transitions focuses on indicators of the phenomenon of critical slowing down that precedes a range of catastroph- ic bifurcation points. However, in highly stochastic environ- ments, systems will tend to shift to alternative basins of attraction already far from such bifurcation points. In fact, strong perturbations (noise) may cause the system to “flick- er” between the basins of attraction of the system’s alterna- tive states. As a result, under such noisy conditions, critical slowing down is not relevant, and one would expect its related generic leading indicators to fail, signaling an impending transition. Here, we systematically explore how flickering may be detected and interpreted as a signal of an emerging alternative attractor. We show that—although the two mechanisms differ—flickering may often be reflected in rising variance, lag-1 autocorrelation and skewness in ways that resemble the effects of critical slowing down. In partic- ular, we demonstrate how the probability distribution of a flickering system can be used to map potential alternative attractors and their resilience. Thus, while flickering sys- tems differ in many ways from the classical image of critical transitions, changes in their dynamics may carry valuable information about upcoming major changes.
In the context of the Pleistocene glacial-interglacial cycling being a “flicker” during transition from one state to another (non glacial to deep glacial), the MPT just represents a slowing down of the flicker near the completion or stabilisation of the state change.
So there may not be many more interglacials before the flickering ends and stable permanent deep glaciation holds for several tens or hundreds of million years.
And as the world’s plants die from lack of CO2 and all life starts to perish, the alarmists will still be saying “Raise the tax on `emissions’!”
To put some numbers on this absurdity –
The annual heat flux through the Bering Straight is calculated to be as high as 6E20J (for 2007 and 2011). That equates to 1.3W/sq.m over the entire Arctic Ocean. Recent heat input has been somewhat lower and is consistent with more sea ice.
With atmospheric CO2 levels now at 408ppm the ARGO data for the first decade of the 21st century showed global thermal imbalance averaged MINUS 0.2W/sq.m.
Shutting down the Bering straight removes 1.3W/sq.m over the entire Arctic ocean while removing CO2 from the atmosphere would cause heating. Which is the more plausible cause of glaciation.
Blame it on “old water” eh? And with a straight face no less.
Old water and rotten ice, no doubt. 😉
The Ice Age connundrum…
When CO2 levels were high, the world cooled into an ice age.
When CO2 levels were low, the wold warmed into an interglacial.
You cannot explain that connundrum using CO2 as the primary feedback agent. You can only explain it, if ice-sheet albedo is the primay feedback.
Modulation of Ice Ages via dust and albedo
https://www.sciencedirect.com/science/article/pii/S1674987116300305
Ralph
The way that the CAGW faithful explain it is that your paleoclimate CO2 data is incorrect. We should be able to model the CO2 levels based on the fact that there was glaciation. Obviously, the models will show that we had a drop in CO2 leading to glaciation and then since the ice melted, we had a rise in CO2. There never was a conundrum after all. And the same process will eliminate pesky data errors such as the so-called medieval warm period, or theories that it was warmer in the 1930s.
Settled science. No need of data!
From the text above,”While the causes of the MPT are not fully known, one of the most prominent theories suggests it may have been driven by reductions in glacial CO2 emissions.”
These words are too definite. It is not a ‘theory’, it is but a few ideas in the early formation of a hypothesis to be tested if it looks worthwhile. Before it becomes a theory, there are many factors to be investigated, understood, placed into context. A simple example is the stability of the remains of the foraminifera and their present ability to reflect earlier conditions.
However, the main concern I have is the forever unsettling one, where is the evidence of the ability of atmospheric CO2 to change the global or local climate, that unproven old assumption that is routinely swept under the carpet as the excitement of the moment closes the eyes of modern authors to this major, fundamental, scientific deficiency.
The present paper seems even to suggest CO2 cooled the surroundings. Apart from the lack of a climate sensitivity figure, apart from the width of the range of official ECS values in the IPCC AR5, we do not seem even to have settled on the sign of the climate sensitivity in cold places.
Geoff.