The Arctic Ocean ice pack has not rebounded from record minimums recorded last summer, causing scientists to worry that the planet's global warming "canary in the coal mine" is in a tightening spiral of decline. Abnormally high temperatures across the Arctic basin most of this winter have slowed the production of new ice, according to Mark Serreze of the National Snow and Ice Data Center at the University of Colorado.
The ice pack lost an area the size of Alaska in 2005 and has thinned dramatically in the last four years. Serreze said conditions are now right for another record-breaking minimum following this summer's melt, provided there isn't a cold snap. "It's just not recovering this winter," Serreze said. "And the basic reason it's not recovering is the Arctic Ocean has been so darn warm."
Weather data shows surface temperatures across much of the Arctic were 4 to 5 degrees above normal September through December. The pack has been at or near record minimums every month this winter and Serreze said Wednesday the latest data for March also shows a record minimum. Satellite images of the sea ice date back to 1978. By using other data, Serreze and his fellow researchers believe the sea ice is at its smallest in more than a century.
The ice pack covered more than 3 million square miles in the mid-1970s. That figure had been whittled down to about 2 million square miles by September, according satellite observations. More than 500,000 square miles of ice disappeared last summer alone, according to Serreze.
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