tipping point

Tue, 2009-03-24 00:29Jeremy Jacquot
Jeremy Jacquot's picture

The Tipping Points

As the world dithers, climate scientists are peering into their crystal balls to predict when the next shoe will drop. In a new study published in the Proceedings of the National Academy of Sciences, a team of international researchers led by Elmar Kriegler of the Potsdam Institute for Climate Impact Research surveyed 43 leading scientists to estimate the likelihood of a tipping point occurring in the near future.

The four tipping points the researchers studied include the restructuring of the Atlantic meridional overturning circulation (also known as the ocean conveyor belt or thermohaline circulation), the complete melting of the Greenland ice sheet, the disintegration of the West Antarctic ice sheet, and the increased frequency of the El Niño Southern Oscillation (ENSO) phenomenon.

Based on the scientists’ feedback, they concluded that there is a one in six chance that at least one tipping point will be triggered under conditions of medium warming (2 – 4ºC) and a more than one in two chance (56%) under conditions of high warming (4 – 8ºC) by 2200.

Wed, 2008-12-17 16:04Page van der Linden
Page van der Linden's picture

Has Arctic sea ice loss become irreversible?

The party’s over, we had us a time..
We burned all the kindling…
Watched the last coals dwindling
And the ice melting down…

Eliza Gilkyson

 

Is the party over?

According to a new study by scientists at the NSICD (National Snow and Ice Data Centre), there’s a good chance that Arctic sea ice has melted beyond the point of no return.

Joseph Romm points us to a story in today’s edition of the UK’s Independent.  The news is not good:

Scientists have found the first unequivocal evidence that the Arctic region is warming at a faster rate than the rest of the world at least a decade before it was predicted to happen.

Climate-change researchers have found that air temperatures in the region are higher than would be normally expected during the autumn because the increased melting of the summer Arctic sea ice is accumulating heat in the ocean. The phenomenon, known as Arctic amplification, was not expected to be seen for at least another 10 or 15 years and the findings will further raise concerns that the Arctic has already passed the climatic tipping-point towards ice-free summers, beyond which it may not recover.

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