Though Box had predicted the severity of last summer’s melt, he struggled to understand why so much ice disappeared so quickly. Some climate modelers pointed to changes in atmospheric circulation patterns that pushed up temperatures across the Arctic. Others attributed it to the heat-trapping properties of low clouds. But Box decided to return to Greenland this summer – his 24th trip here in the past 20 years – to test a more startling hypothesis, part of what he calls “a unified theory” of glaciology: that tundra fires in Canada, massive wildfires in Colorado and pollution from coal-fired power plants in Europe and China had sent an unexpectedly thick layer of soot over the Arctic region last summer, which settled onto Greenland’s vast frozen interior, increasing the amount of sunlight the snow and ice absorbed, which in turn accelerated the melting. It was a powerful connection – but was it true?
Posted on: Wed, 31 Jul 2013 03:13:32 +0000
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