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It's midwinter in the Arctic, and the sun has yet to rise over the North Pole,

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But the Arctic is unusually warm for this time of year, with temperatures above freezing in the area north of Greenland.

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Sea ice in this region should be thick and strong, but satellite data show the ice breaking up, exposing open sea.

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Satellite data help us understand changes in the warming Arctic,

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And in March, NASA's Operation IceBridge will provide detailed airborne measurements of sea ice in this region.