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Regular patterns in frictional resistance of ice-stream beds seen by surface data inversion

Sergienko, Olga V.; Hindmarsh, Richard C.A.. 2013 Regular patterns in frictional resistance of ice-stream beds seen by surface data inversion. Science, 342 (6162). 1086-1089. 10.1126/science.1243903

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Abstract/Summary

Fast-flowing glaciers and ice streams are pathways for ice discharge from the interior of the Antarctic Ice Sheet to ice shelves, at rates controlled by conditions at the ice-bed interface. Using recently compiled high-resolution data sets and a standard inverse method, we computed basal shear stress distributions beneath Pine Island and Thwaites Glaciers, which are currently losing mass at an accelerating rate. The inversions reveal the presence of rib-like patterns of very high basal shear stress embedded within much larger areas with zero basal shear stress. Their colocation with highs in the gradient of hydraulic potential suggests that subglacial water may control the evolution of these high shear stress ribs, potentially causing migration of the grounding line by changes in basal resistance in its vicinity.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1126/science.1243903
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ice Sheets
ISSN: 00368075
Date made live: 12 Nov 2013 10:02 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/503366

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