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2008-04 Ice Freeboard 2007-2008

Another way to study sea ice thickness is to look at freeboard, or the amount of ice and snow that protrudes above the water surface. Freeboard for winter 2007 (left) and 2008 (right). Purple indicates no freeboard; red indicates ice freeboard 80 centimeters (2.6 feet) thick or greater; grey is land and white indicates no data. Colleague Ronald Kwok from Jet Propulsion Laboratory supplied this image. http://www.nsidc.org/arcticseaicenews/2008/040708.html - http://www.nsidc.org/images/arcticseaicenews/200804_Figure6.png
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