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Polar Melt

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The midnight sun casts a golden glow on an iceberg and its reflection in Disko Bay, Greenland. Much of Greenland’s annual mass loss occurs through calving of icebergs such as this. (Photo courtesy Ian Joughin)
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The midnight sun casts a golden glow on an iceberg and its reflection in Disko Bay, Greenland. Much of Greenland’s annual mass loss occurs through calving of icebergs such as this. (Photo courtesy Ian Joughin)

Each summer, streams channel much of the melt that is produced by the warmer temperatures along the Greenland Ice Sheet’s lower elevation margins. (Photo courtesy Ian Joughin)
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Each summer, streams channel much of the melt that is produced by the warmer temperatures along the Greenland Ice Sheet’s lower elevation margins. (Photo courtesy Ian Joughin)

Surface melt water rushes along the surface of the Greenland Ice Sheet through a supra-glacial stream channel. (Photo courtesy Ian Joughin)
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Surface melt water rushes along the surface of the Greenland Ice Sheet through a supra-glacial stream channel. (Photo courtesy Ian Joughin)

Over the course of several years, turbulent water overflow from a large melt lake carved this 60-foot deep canyon. Note the people for scale. (Photo courtesy of Ian Joughin)
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Over the course of several years, turbulent water overflow from a large melt lake carved this 60-foot deep canyon. Note the people for scale. (Photo courtesy of Ian Joughin)

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