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Approaching the 2011 Arctic Sea Ice Minimum. Every year, the frozen Arctic Ocean emerges from winter and thaws under the 24-hour light of the summer sun. Each year is different: sometimes ice retreats from the shores in dramatic fashion and other years have a more gradual melt. 2011 proved to be a year of extreme melt. By early September, the area covered by sea ice in the Arctic Ocean was approaching a record low.
This animation shows the melt during the summer of 2011. (Click the link below the image to download.) The animation was made with measurements taken by the Advanced Microwave Scanning Radiometer–EOS (AMSR-E) on NASA’s Aqua satellite between March 7 and September 9. The final image in the series, shown above, shows the sea ice at it lowest point so far this season. Most notably, the Northwest Passage, the sea route that threads through the islands of northern Canada to link the Atlantic and Pacific Oceans, is entirely ice free. In 2007—the last time sea ice reached similarly low levels—conditions were ideal for melt.