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      Convection-Driven Melting near the Grounding Lines of Ice Shelves and Tidewater Glaciers

      Journal of Physical Oceanography

      American Meteorological Society

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          Most cited references 34

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          Acceleration of Jakobshavn Isbræ triggered by warm subsurface ocean waters

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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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              Partitioning recent Greenland mass loss.

              Mass budget calculations, validated with satellite gravity observations [from the Gravity Recovery and Climate Experiment (GRACE) satellites], enable us to quantify the individual components of recent Greenland mass loss. The total 2000-2008 mass loss of approximately 1500 gigatons, equivalent to 0.46 millimeters per year of global sea level rise, is equally split between surface processes (runoff and precipitation) and ice dynamics. Without the moderating effects of increased snowfall and refreezing, post-1996 Greenland ice sheet mass losses would have been 100% higher. Since 2006, high summer melt rates have increased Greenland ice sheet mass loss to 273 gigatons per year (0.75 millimeters per year of equivalent sea level rise). The seasonal cycle in surface mass balance fully accounts for detrended GRACE mass variations, confirming insignificant subannual variation in ice sheet discharge.
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                Author and article information

                Journal
                Journal of Physical Oceanography
                J. Phys. Oceanogr.
                American Meteorological Society
                0022-3670
                1520-0485
                December 2011
                December 2011
                : 41
                : 12
                : 2279-2294
                Article
                10.1175/JPO-D-11-03.1
                © 2011

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