Dynamic response to the enhanced basal flow in the Greenland ice sheet

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Measurements of ice velocities in the marginal regions of Greenland ice sheet have shown a melt-acceleration effect (Zwally and others, 2002). Water from surface melting rapidly penetrates to the bed through moulins and crevasses and increases the ice flow due to the enhanced basal lubrication and sliding. A 3-dimensional time-dependent ice flow model is developed with incorporation of a seasonal basal sliding parameterization that depends on estimates of the meltwater penetration to the bed. The model is applied to the Greenland ice sheet to investigate the dynamic response to climate change from the melt-acceleration effect.