west antarctic ice sheet

Tue, 2014-05-13 11:14Chris Rose
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Scientists Fear Massive Sea Level Rise from "Unstoppable" Melt of West Antarctica Ice Sheet

thwaites glacier, west antarctic ice melt, nasa, climate change

Two new academic studies released Monday reveal that the crucial West Antarctic ice sheet is now melting, a seemingly unstoppable disaster that could eventually trigger sea levels to rise by more than 14 feet (4.3 metres).

The studies could finally make politicians rethink how climate change is affecting humankind and how society is going to deal with the increasingly expensive cost of mitigating climate change caused by burning fossil fuels overheating our atmosphere.

One of the studies indicates the glaciers in the Amundsen Sea sector of West Antarctica “have passed the point of no return,” according to glaciologist and lead author Eric Rignot, of UC Irvine and NASA’s Jet Propulsion Laboratory in California. The new study has been accepted for publication in the journal Geophysical Research Letters.

NASA says the glaciers already contribute significantly to sea level rise, releasing almost as much ice into the ocean annually as the entire Greenland ice sheet. “They contain enough ice to raise global sea level by four feet (1.2 metres) and are melting faster than most scientists had expected,” according to a press release.

Tue, 2009-03-24 00:29Jeremy Jacquot
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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.

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