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Study: Arctic went through ice-free stages

The Local · 22 Jun 2012, 07:47

Published: 22 Jun 2012 07:47 GMT+02:00

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The international team, headed by Martin Melles of the University of Cologne, Germany, drilled into an iced-over lake formed by a meteorite impact on the Chukchi Peninsula in Siberia for the longest sediment core ever collected in the terrestrial Arctic.

Since the meteorite struck an area of Lake El'gygytgyn that was not eroded by glaciers, the sediment record reaches back nearly 30 times further in time than ice cores from Greenland that cover the past 110,000 years.

The sediment reveals periods of extreme warmth that show the polar regions are much more vulnerable to change than previously thought, and are difficult to explain by greenhouse gases alone, said the study in the journal Science.

Scientists have long known that the Arctic went through climate cycles, but the latest research shows some of these warm phases were "exceptional," with temperatures four to five degrees Celsius warmer and 12 inches wetter than during normal interglacials, the study said.

Two of these "super-interglacials" happened about 400,000 years ago and 1.1 million years ago, and the data suggests it was virtually impossible for Greenland's ice sheet to have existed in its present form at those times.

But just what caused these extreme changes remains a mystery.

Since some of the Arctic changes mirror variations in the Antarctic discovered by previous studies, events at one pole may have triggered events at the other, the researchers said.

One possibility is that reduced ice cover in Antarctica led to less cold bottom water mass in the northern Pacific, triggering warmer surface waters, higher temperatures and more precipitation.

Story continues below…

Another is that the dissolving Antarctic ice sheet led to global sea level rise that sent warm water rushing into the Arctic Ocean, the study said.

Co-authors of the study included experts from the University of Massachusetts and the Far East Branch of the Russian Academy of Sciences.


The Local (news@thelocal.de)

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Your comments about this article

12:52 June 22, 2012 by pepsionice
It can only be.....global warming, climate change, or global cooling. Yes, that would explain it all. The Nethanderthal Institute of Climate Change discussed this over the decades and tried to urge Cavemen to stop burning wood to warm themselves....but they just wouldn't listen.
13:00 June 22, 2012 by delvek
Great comment, lol.

I wonder if the caveman climatologist baited the caveman with Cadillacs and Mercedes they would listen?

Global Warming ... biggest scam in history. I think I will go buy some carbon offset because I just farted.
16:54 June 22, 2012 by IchBinKönig
Now if only the 'Flat Earth'ers and their Church of Gore, would finally wake up. I'm not holding my breath. The Paul Krugman/Nobel crew is too busy preparing for the coming Alien Invasion.
20:09 June 22, 2012 by Loth
How did everything go back to normal without a carbon tax?
18:05 August 4, 2012 by Laurent1
Notice that the Chukchi peninsula is at the easternmost part of Siberia, near the "Beringia" landbridge connecting Asia with North America during the ice ages. This area was not glaciated because it was comparatively warm (a cold steppe, actually), and was inhabited by mammoths. The glaciers of the last two ice ages were in eastern North America, the Rocky mountain cordilllera, and Northwest Europe. This would support prof. Hapgood's theory of shifting poles.
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