Columbia Glacier, Alaska, 2010

Columbia Glacier, Alaska, 2010

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Caption: Columbia Glacier, Alaska. False-colour satellite image of the Columbia Glacier, Alaska, USA, taken in 2010. Columbia Glacier descends from an ice field (top) 3,050 metres above sea level, down the flanks of the Chugach Mountains, and into a narrow inlet that leads into Prince William Sound (bottom centre) in southeastern Alaska. It is one of the most rapidly changing glaciers in the world. Snow and ice appears bright cyan, vegetation is green, clouds are white or light orange, and the open ocean is dark blue. Exposed bedrock is brown, while rocky debris on the glacier's surface is gray. Between 1980 and 2011 the glacier had retreated 20 kilometres north and lost roughly half its thickness and volume. Imaged by NASA's Landsat satellites, on 16th September.

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