The change in the amount of Arctic sea ice from 1980 (top) to 2012 (bottom). 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. Arctic multi-year ice extent has been vanishing at a rate of -15.1 percent per decade. Over the same period, the area covered by multi-year ice has been shrinking by -17.2 percent per decade. Data from passive microwave sensors on NASA's Nimbus-7 satellite and the Special Sensor Microwave Imager/Sounder (SSMIS) on the Defense Meteorological Satellite Program (DMSP). Multi-year ice is bright white, average sea ice cover is light blue to milky white. The data shows the ice cover for the period of November 1 through January 31 in their respective.
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