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The 2007 melting season set a new record for snowmelt over the Greenland ice sheet, according to analysis of spaceborne microwave brightness temperatures measured by the Special Sensor Microwave Imaging radiometer aboard the U.S. Defense Meteorological Satellites Program.

As shown in Figure la, positive melting anomaly values, calculated as the difference between the number of melting days occurring in 2007 and the average number of melting days during the period 1988–2006, are concentrated on large inland areas in southern Greenland.