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"What saved the West Antarctic Ice Sheet 10,000 years ago " Topic


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200 hits since 22 Aug 2018
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Comments or corrections?

Tango0122 Aug 2018 10:09 p.m. PST

….will not save it today.


"The retreat of the West Antarctic ice masses after the last Ice Age was reversed surprisingly about 10,000 years ago, scientists found. This is in stark contrast to previous assumptions. In fact it was the shrinking itself that stopped the shrinking: relieved from the weight of the ice, the Earth crust lifted and triggered the re-advance of the ice sheet. However, this mechanism is much to slow to prevent dangerous sea-level rise caused by West Antarctica's ice-loss in the present and near future. Only rapid greenhouse-gas emission reductions can.

"The warming after the last Ice Age made the ice masses of West Antarctica dwindle," says Torsten Albrecht from the Potsdam Institute for Climate Impact Research, one of the three lead authors of the study now published in the scientific journal Nature. "It retreated inland by more than 1000 kilometers in a period of 1,000 years in large parts of this region -- on geological time-scales, this is really high-speed. But now we detected that this process at some point got partially reversed. Instead of potential collapse, the ice sheet grew again by up to 400 kilometers. This is a limited, yet amazing self-induced stabilization. However, it took a whopping 10,000 years, up until now. Given the speed of current climate-change from burning fossil fuels, the mechanism we detected unfortunately does not work fast enough to save today's ice sheets from melting and causing seas to rise."…."
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Amicalement
Armand

Cacique Caribe23 Aug 2018 12:54 p.m. PST

Maybe it has something to do with the fact that the planet didn't stop naturally warming up 10,000 years ago.

Dan
PS. "But now we detected that this process at some point got partially reversed. Instead of potential collapse, the ice sheet grew again by up to 400 kilometers." And yet they were so absolutely sure that it wasn't going to reverse, just as sure as whatever their prediction is this time around. :)

Tango0124 Aug 2018 12:15 p.m. PST

(smile)

Amicalement
Armand

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