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February 27, 2017
A River Runs 40 km Across the Greenland Ice Sheet
Supraglacial stream, on July 26, 2016 Landsat image, stretching 40 km across the ice sheet from the transient snowline, which marks the boundary between the percolation zone and the wet snow zone, west toward the ice sheet margin, note black arrows. The Greenland Ice Sheet has experienced a significant increase in surface melt. This is due both to warmer temperatures and enhanced melt due to a reduction in reflectivity-albedo. The expansion …