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Winter's freezing, so what's with Arctic sea ice?

An unusually warm January has limited the return of Arctic sea ice, whose extent set a record low for the month. The ice's ability to reflect sunlight back into space has a significant influence on climate worldwide.

Image

A polar bear in the Arctic National Wildlife Refuge in Alaska. If the world dramatically changes its steadily increasing emissions of greenhouse gases, global warming can be slowed enough to prevent a total loss of critical summer sea ice for the polar bears, according to a study in the journal Nature last December.

Subhankar Banerjee/AP/File

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Much of the US continues to dig out from record snows and shivers from unusually frigid temperatures. But at the top of the world, an unusually warm January has limited the return of Arctic sea ice, whose extent set a record low for the month, according to the National Snow and Ice Data Center in Boulder, Colo.

Indeed, through January, the season's sea-ice return is closely tracking that of ice during the winter of 2006-2007, according to data the center released earlier this week. The below average return of sea ice then contributed to a record low summer-ice extent during the 2007 melt season.

Climate scientists keep close tabs on the Arctic Ocean's ice – particularly during the sun-drenched melt season – because the ice's ability to reflect sunlight back into space has a significant influence on climate worldwide, more so than Antarctica's sea ice, researchers say.

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Antarctica's sea ice builds quickly during its winter months and extends over large areas of the ocean surrounding the continent, even as the Arctic Ocean's ice retreats.

But Antarctic sea ice shrinks quickly during its melt season, covering only a tiny fraction of the area it spans during the Austral winter, when it's dark. Arctic Ocean sea ice, by contrast, typically extends over much of the Arctic Ocean, even through the melt season, reflecting sunlight and keeping the region cooler than it otherwise would be.

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