From the European Space Agency (ESA):
Satellite observes rapid ice shelf disintegration in Antarctic
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5 April 2012
As ESA’s Envisat satellite marks ten years in orbit, it continues to observe the rapid retreat of one of Antarctica’s ice shelves due to climate warming.
One of the satellite’s first observations following its launch on 1 March 2002 was of break-up of a main section of the Larsen B ice shelf in Antarctica – when 3200 sq km of ice disintegrated within a few days due to mechanical instabilities of the ice masses triggered by climate warming.
Now, with ten years of observations using its Advanced Synthetic Aperture Radar (ASAR), Envisat has mapped an additional loss in Larsen B’s area of 1790 sq km over the past decade.
The Larsen Ice Shelf is a series of three shelves – A (the smallest), B and C (the largest) – that extend from north to south along the eastern side of the Antarctic Peninsula.
Larsen A disintegrated in January 1995. Larsen C so far has been stable in area, but satellite observations have shown thinning and an increasing duration of melt events in summer.
“Ice shelves are sensitive to atmospheric warming and to changes in ocean currents and temperatures,” said Prof. Helmut Rott from the University of Innsbruck.

“The northern Antarctic Peninsula has been subject to atmospheric warming of about 2.5°C over the last 50 years – a much stronger warming trend than on global average, causing retreat and disintegration of ice shelves.”
Larsen B decreased in area from 11512 sq km in early January 1995 to 6664 sq km in February 2002 due to several calving events. The disintegration in March 2002 left behind only 3463 sq km. Today, Envisat shows that only 1670 sq km remain.
Envisat has already doubled its planned lifetime, but is scheduled to continue observations of Earth’s ice caps, land, oceans and atmosphere for at least another two years.
This ensures the continuity of crucial Earth-observation data until the next generation of satellites – the Sentinels – begin operations in 2013.

Credits: ESA
“Long-term systematic observations are of particular importance for understanding and modelling cryospheric processes in order to advance the predictive capabilities on the response of snow and ice to climate change,” said Prof. Rott.

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“Climate models are predicting drastic warming for high latitudes. The Envisat observations of the Larsen Ice Shelf confirm the vulnerability of ice shelves to climatic warming and demonstrate the importance of ice shelves for the stability of glaciers upstream.
“These observations are very relevant for estimating the future behaviour of the much larger ice masses of West Antarctica if warming spreads further south.”
Radars on Earth observation satellites, such as Envisat’s ASAR, are particularly useful for monitoring polar regions because they can acquire images through clouds and darkness.
The Sentinel missions – being developed as part of Europe’s Global Monitoring for Environment and Security (GMES) programme – will continue the legacy of radar observations.
Hugh Pepper. LMAO every time I see the name. He really should get a new handle. Sorry, moderators can delete if you wish but I just know I am going to see a gem every time that handle comes up …
Prof. Rott says “Climate models are predicting drastic warming for high latitudes” but climate models do not predict. They “project.”
Oh, Hugh, you’re just droning on. Nothing of a sort has come to pass. Always trying to impress with tales of tipping points. Call us when the oceans boil, OK?
Birdieshooter says:
April 5, 2012 at 4:49 pm
Could someone give me a scientifically defensible reconciliation of the Antarctica ice shelves retreat and the SH Sea Ice anomaly being above average per Joe Bastardi link. To this simple mind one doesnt follow the other
I hope so. Mt. Erebus is an active volcano, close to the Antarctic Peninsular. So there is evidence of vulcanism in that area. There is speculation that some of this vulcanism is actiive on the sea floor around the Antarctic Peninsular. If this has increased in recent years, and there is no data one way or the other, this could explain the abnormal warming of the oceans surrounding the peninsular.
Then there are volcanoes and earthquakes as possible causes for the crack.
Earthquakes in the ocean along South American coast (1): http://ptwc.weather.gov/ptwc/?region=2&id=hawaii.TIBHWX.2012.03.25.2245
Earthquakes in the Vanuatu Islands area (6) http://ptwc.weather.gov/ptwc/?region=2&id=hawaii.TIBHWX.2012.03.09.0717
from Reporting Centers (1 thru 6): http://ptwc.weather.gov/ptwc/?region=0
Major Volcanoes of the Antarctica Map: http://vulcan.wr.usgs.gov/Imgs/Gif/Antarctica/Maps/map_antarctica_volcanoes.gif
Description: http://vulcan.wr.usgs.gov/Volcanoes/Antarctica/description_antarctica_volcanoes.html
Underwater Antarctic Volcanoes Discovered in the Southern Ocean around the South Sandwich Islands: http://www.sciencedaily.com/releases/2011/07/110711104755.htm
Weasel word alert!!!
“if warming spreads further south.”
Terry Oldberg says:
“…climate models do not predict. ‘They “project.'”
And the evaluation is that they can’t project accurately, not to mention their completely inaccurate forecasting and hindcasting disability.
. . .
Hugh Pepper says:
What we see occurring at both Poles and in the Himalayas are changes equivalent to the “canary in the cage” phenomena.
That’s “canary in the coal mine”, Hugh. And…
…warming will accelerate even more rapidly than at present.
Warming is decelerating, not accelerating at present. I can explain it for you, Hugh, but I can’t understand it for you.
What we really need is the “Hugh Pepper in a cage” phenomena. We would place the cage in the center of the Antarctic – ground zero if you will. We would record the results. The following year we would place the cage, with contents, at the North Pole and record our findings.
This would allow us to determine the exact effects of extreme warming of the poles.
Thank you Gail Combs! You’ve made my exploration much easier.
How do we know this is caused by global warming. I have always suspected erosion from the ocean on the penninsula could cause the breakup because some parts of the pennjunsula are exposed to the ocean almost year round and are not protected by the sea ice like most of the continent. ??
Hey Hugh Pepper, the very real danger is that the Earth may enjoy another climatic optimum as untold billions of plants and critters thrive in a more hospitable warmer climate allowing the biosphere to expand and prosper, nourished by a rebound of atmospheric CO2 as it returns to more bountiful and historical levels enjoyed in the past.
imoira says:
April 5, 2012 at 6:05 pm
Thank you Gail Combs! You’ve made my exploration much easier.
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Your welcome. I had the darnest time figuring out just where everything was down there. Geologically it is not exactly what you would call quiet. Given the japanese tsunami hit Hawaii ( 3ft wave) you could have something interesting going on with a decent size underwater earthquake or volcano.
I think the break up happened because the moon was in the Seventh House and Jupiter aligned with Mars.
The crack in the ice cannot be caused by radiation from carbon dioxide, because not even the radiation in a microwave oven can melt ice directly.
In my view we need to focus on the assumed problem, namely carbon dioxide and, to a lesser extent, methane perhaps. If I refer to trace gases take it to mean these, because I refuse to call them greenhouse gases.
We have what we have in the Earth’s total system. Somehow, in some way we may never fully understand, a long-term near equilibrium situation has developed. We have some energy being generated in the core, mantle and crust, most likely by fission I think, but I won’t go into that. But it does set up a temperature gradient from the core to the surface which is very stable below the outer kilometre or so of the crust. However, it may vary in long-term natural cycles that have something to do with planetary orbits. Likewise, the intensity of solar radiation getting through the atmosphere to the surface may also vary in natural cycles which may have something to do with planetary influences on the Sun, and on the eccentricity of Earth’s orbit and on cosmic ray intensity and on cloud cover, ENSO cycles etc.
There is much to be learned about such natural cycles, and we have seen papers by Nicola Scafetta for example which appear to provide compelling evidence of the natural cycles. I believe that in fact such natural cycles are quite sufficient to explain all observed climate change, including what has happened in the last half century or so, right up to the present. The world has just been alarmed because the 1000 year cycle and the 60 year cycle were both rising around 1970 to 1998, just as they did by about the same amount 60 years earlier, and 60 years before that and no doubt further back. We cannot escape the obvious fact that there is a ~1000 year cycle which is due for another maximum within 50 to 200 years. Then there will be 500 years of falling temperatures.
But the central issue is whether or not trace gases are really having any effect at all on climate.
In my paper I have explained the physics of heat transfer and demonstrated why trace gases cannot have any effect whatsoever on what we call climate.
Climate may be thought of as the mean of temperature measurements, usually made in the air between 1.5 and 2 metres above the ground. Thermometers are affected by the thermal energy in that air near the surface. As you can read here thermal energy is distinct from heat. It is transferred by molecular collision processes (conduction and diffusion,) by physical movement (convection) and by radiation. . The energy in radiation is not thermal energy. Thermal energy is first converted to electromagnetic (radiated) energy and then that EM energy has to be converted back to thermal energy in a target. Hence, in a sense thermal energy only appears to be transferred by radiation.
The Second Law of Thermodynamics (SLoT) tells us that in any (one way, independent) spontaneous process, entropy cannot decrease unless external energy is added. There are no two ways about it. If spontaneous radiation emanates from a cooler object (or atmosphere) its EM energy cannot be converted back to thermal energy in a warmer target, such as Earth’s surface. This point is not debatable. A violation of the SLoT cannot be excused on the grounds that there will be some subsequent independent process (maybe not even radiation) which will transfer more thermal energy back to the atmosphere. If you disagree, you are mistaken.
However, the radiation from a cooler body can affect the radiative component of the cooling of a warmer body. Although such radiation undergoes what I call “resonant scattering” this does involve the “resonators” in the warmer body and uses up some of its radiating capacity. Because the incident radiation supplies the energy, the warmer body does not need to convert an equivalent amount of its own thermal energy. Hence it cools more slowly.
But, the resonating process involves all the (potential) different frequencies in the incident radiation. There will be far less effect when there are limited frequencies as is the case for radiation from a trace gas in the atmosphere. Furthermore, the effect depends on the temperature of that gas and is less when it is cooler. It is far less from space (equivalent to about 2.7K) and so there is no slowing of cooling for that portion of radiation which gets through the atmospheric window.
The remaining radiation (when we look at net figures, not all that backradiation) represents less than a third of all the cooling processes from the surface to the atmosphere. The other non-radiative processes can, and will, simply speed up in order to compensate, because they do so if the temperature gap increases. There are further reasons discussed in Q.3 in the Appendix of my paper.
So there is no overall effect at all due to trace gases on the rate of cooling of the surface. Thus there can be no effect upon climate.
Discussion on this continues on this thread.
The rush to publish prior to funding running out is becoming quite common.
Oh the pain!
Hi All,
Is the data from Werner Brozek for the entire planet or just for the Antartic Region?
CF says
I’m no climate scientist, so the above quote leaves me with the following question: How exactly does CO2 cause the northern Antarctic Peninsula to warm up more than the rest of the world? Shouldn’t CO2 be warming the world more uniformly, if indeed it is doing it at all?
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I am not a climate scientist either so allow me to speculate. Most of the earth’s increased heat retention occurs at the equator and the excess heat then moves to the poles. So heat collected over a large area is concentated into a smaller area. Hence a moderate temp increase at the equator becomes a larger one at the poles.
I suspect albedo feedback may also be important.
What?
Only one troll?
I would urge caution in these comments. You may want to consider the difference between ice shelf and sea ice.
There is no link to the article!
While for some, calving of Antarctic ice shelves is caused by global warming, for me it contributes to global cooling.
Consider what happens when an ice shelf breaks off into the southern sea. Consider just how much cooling it will produce as it goes through the process of re-liquification.
I love it when people jump on a topic with the old “canary in a coal mine” analogy.
The thing about using canaries was that canaries were more sensitive to “bad air” than the candles miners used to depend on. The problem with depending on a candle’s or lamp’s flame approach is that by the time a candle stopped burning, people were passing out. Add to that the danger a candle causes in coal mines and canaries were a blessing especially in said coal mines.
The thing is, canaries were fairly effective in their role; proven indicators you see.
Then the alarmists come along hollering about imminent dangers and cascading calamities and claiming that action/money/deprivation is immediately required! Gee, I wonder why they’re called alarmists? These alarmists throw out phrases like “canary in a cage”, “accelerating”, and “turning points” and many more silly scares and they point rapidly in all directions.
I am reminded of the classic pickpocket/thief ruses where one distracts while the others pilfer our citizens honest money.
What proof do ye alarmists offer that indicates there is any cause for concern? Proof, is solid tangible evidence. Proof is not a model product!
cafeproz says:
April 5, 2012 at 7:10 pm
Hi All,
Is the data from Werner Brozek for the entire planet or just for the Antarctic Region?
All data are global at http://www.woodfortrees.org/plot/
However there are many different things you can plot if interested. Just click under “Data source” and see over 30 things that can be plotted and analyzed. But one of the few things NOT there is polar anomalies. If you want more details from the poles, see:
http://vortex.nsstc.uah.edu/data/msu/t2lt/uahncdc.lt
This looks more like a cooling event than a warming event. 3200 square miles is a lot of cold water when it melts. This is the counter to Trenberth’s missing heat – now we know where the missing cold is, though.
Also – do the alarmists believe that we are in a glacier building period? I think that has not been the case since the end of the LIA. Coincidence the snout ice age in many parts of the world is from that time?
CD (@CD153) says:
April 5, 2012 at 3:51 pm
“The northern Antarctic Peninsula has been subject to atmospheric warming of about 2.5°C over the last 50 years – a much stronger warming trend than on global average, causing retreat and disintegration of ice shelves.”
I’m no climate scientist, so the above quote leaves me with the following question: How exactly does CO2 cause the northern Antarctic Peninsula to warm up more than the rest of the world? Shouldn’t CO2 be warming the world more uniformly, if indeed it is doing it at all?
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no C02 would not warm the world uniformly. Neither would an increase in TSI or any other forcing for that matter at least not on small time scales.
http://www.realclimate.org/index.php/archives/2006/01/polar-amplification/
http://ossfoundation.us/projects/environment/global-warming/arctic-polar-amplification-effect
It would be very odd indeed if the world warmed uniformly. In fact you can expect that some places will warm more and other will warm less. geographically warming will be highest in northern latitudes ( generally).
Finally, c02 doesnt “cause” warming in the way you think. Adding C02 or any GHG to the atmosphere raising the height at which the earth radiates that means, following known physical law, that the earth will cool less rapidly than it would otherwise. The spatio temporal distribution of that effect is not homogenous. We expect differentials.