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Reports
Submitted on December 6, 2006 Rapid Changes in Ice Discharge from Greenland Outlet Glaciers
1 Polar Science Center, Applied Physics Lab, University of Washington, 1013 NE 40th Street, Seattle, WA 98105-6698, USA; National Snow and Ice Data Center, University of Colorado, 1540 30th Street, Boulder, CO, 80309-0449, USA. * To whom correspondence should be addressed.
Using satellite-derived surface elevation and velocity data, we find major short-term variations in recent ice discharge and mass-loss at two of Greenland's largest outlet glaciers. Their combined rate of mass-loss doubled in less than a year in 2004 and then decreased in 2006 to near the previous rates, likely due to fast re-equilibration of calving front geometry following retreat. Total mass-loss is a fraction of concurrent gravity-derived estimates, pointing to an alternative source of loss and the need for high-resolution observations of outlet dynamics and glacier geometry for sea-level rise predictions.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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