06 Mar '12, 11pm

NASA: Oldest Arctic Sea Ice is Disappearing #green

View Image Comparison View Both Images A new study by NASA scientist Joey Comiso has found that the oldest and thickest Arctic sea ice is disappearing at a faster rate than the younger and thinner ice at the edges of the ice cap. The rapid disappearance of older ice makes the Arctic Ocean's sea ice cap more vulnerable to further decline. Arctic multi-year ice “extent”—which includes all areas where at least 15 percent of the ocean surface is covered by multi-year ice—has been vanishing at a rate of –15.1 percent per decade, Comiso found. Over the same period, the “area” covered by multi-year ice—which discards open water among ice floes and focuses exclusively on regions that are completely covered—has been shrinking by –17.2 percent per decade. The findings were published in February 2012 in the Journal of Climate. The images above show sea ice coverage in 1980 and 2012, ...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=77270&s...

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