Arctic Sea Ice
by Science Source
Title
Arctic Sea Ice
Artist
Science Source
Medium
Photograph - Photograph
Description
June through September 2007 brought record sea ice melt in the Arctic, well below the previous record low, set in September 2005. According to the National Snow and Ice Data Center (NSIDC), on September 16, 2007, sea ice extent dropped to 4.13 million square kilometers (1.59 million square miles), 38 percent below average and 24 percent below the 2005 record. This image of the Arctic was produced from sea ice observations collected by the Advanced Microwave Scanning Radiometer (AMSR-E) Instrument on NASA's Aqua satellite on September 16, overlaid on the NASA Blue Marble. The image captures ice conditions at the end of the melt season. Sea ice (white, image center) stretches across the Arctic Ocean from Greenland (top) to Russia, but large areas of open water were apparent as well. In addition to record melt, the summer of 2007 brought an ice-free opening though the Northwest Passage (clearing to right of main ice mass) that lasted several weeks. The Northeast Passage did not open during the summer of 2007, however, as a substantial tongue of ice remained in place north of the Russian coast. Although the 2007 melt season started out with slightly greater sea ice extent than 2005, melt accelerated in the second half of June, especially in the East Siberian Sea (bottom), where warm temperatures and clear skies hastened the ice's retreat. From early July onward, ice extent remained below the levels of 2005. By early August, more than a month before the end of the melt season, the extent had already dropped below the minimum reached at the end of the 2005 melt season. The Arctic started to regain ice in mid-September, as summer came to a close. Sea ice acts as the Earth's built-in air conditioner. Because of its light color, Arctic sea ice reflects most of the sunlight reaching it back into space. In contrast, dark ocean water absorbs most of the sunlight.
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May 30th, 2013
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