The sea ice extent in the Arctic varies seasonally from 7 (summer) to 14 (winter) million sq km. Summer melt occurs mostly on the vast Arctic shelves, while the central Arctic Ocean is covered by its unique, multi-year ice year-round.
Related Links
Arctic Exploration: The Life in Arctic Sea Ice
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Revised May 27, 2009 | Web Site Owner: NOAA, Office of Ocean Exploration and Research
National Oceanic and Atmospheric Administration
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http://oceanexplorer.noaa.gov/explorations/02arctic/background/sea_ice/media/polar_ice.html
