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      Calving processes and the dynamics of calving glaciers

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      Earth-Science Reviews

      Elsevier BV

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          Changes in the velocity structure of the Greenland Ice Sheet.

          Using satellite radar interferometry observations of Greenland, we detected widespread glacier acceleration below 66 degrees north between 1996 and 2000, which rapidly expanded to 70 degrees north in 2005. Accelerated ice discharge in the west and particularly in the east doubled the ice sheet mass deficit in the last decade from 90 to 220 cubic kilometers per year. As more glaciers accelerate farther north, the contribution of Greenland to sea-level rise will continue to increase.
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            Surface melt-induced acceleration of Greenland ice-sheet flow.

            Ice flow at a location in the equilibrium zone of the west-central Greenland Ice Sheet accelerates above the midwinter average rate during periods of summer melting. The near coincidence of the ice acceleration with the duration of surface melting, followed by deceleration after the melting ceases, indicates that glacial sliding is enhanced by rapid migration of surface meltwater to the ice-bedrock interface. Interannual variations in the ice acceleration are correlated with variations in the intensity of the surface melting, with larger increases accompanying higher amounts of summer melting. The indicated coupling between surface melting and ice-sheet flow provides a mechanism for rapid, large-scale, dynamic responses of ice sheets to climate warming.
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              West Antarctic ice sheet and CO2 greenhouse effect: a threat of disaster

               J. Mercer (1978)
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                Author and article information

                Journal
                Earth-Science Reviews
                Earth-Science Reviews
                Elsevier BV
                00128252
                June 2007
                June 2007
                : 82
                : 3-4
                : 143-179
                Article
                10.1016/j.earscirev.2007.02.002
                © 2007

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