Thinning ice leads to winter warming in the Arctic | Science News

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Thinning ice leads to winter warming in the Arctic

Heat-trapping blanket of moisture rising from the sea causes trouble for North Pole, climate simulation shows

8:23am, November 23, 2015
thin ice in Arctic Sea

WARM NIGHTS  During autumn and winter, thinning Artic sea ice increases heat-trapping water vapor in the air, leading to more ice loss, new research suggests.

Even when the Arctic goes dark and cold, thinning ice could keep the North Pole from cooling off.

The loss of insulating ice between the ocean and atmosphere increases the amount of heat-trapping water vapor and clouds in the Arctic air. That extra moisture keeps air temperatures relatively warm during fall and winter and melts even more ice, new climate simulations suggest. This self-reinforcing cycle could partially explain why Arctic warming has outpaced the global average over recent decades, researchers report online November 11 in the Journal of Climate.

The heat trapped by the extra moisture is about three times as much as is gained during summer when reflective sea ice gives way to dark, light-absorbing open ocean, the researchers estimate. Arctic temperatures, therefore, will continue rapidly rising “long after the summer ice is out of business,” says coauthor David

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