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Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model

Ma, Ying; Gagliardini, Olivier; Ritz, Catherine; Gillet-Chaulet, Fabien; Durand, Gaël; Montagnat, Maurine. 2010 Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model. Journal of Glaciology, 56 (199). 805-812. 10.3189/002214310794457209

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Abstract/Summary

Polar ice is known to be one of the most anisotropic natural materials. For a given fabric the polycrystal viscous response is strongly dependent on the actual state of stress and strain rate. Within an ice sheet, grounded-ice parts and ice shelves have completely different stress regimes, so one should expect completely different impacts of ice anisotropy on the flow. The aim of this work is to quantify, through the concept of enhancement factors, the influence of ice anisotropy on the flow of grounded ice and ice shelves. For this purpose, a full-Stokes anisotropic marine ice-sheet flowline model is used to compare isotropic and anisotropic diagnostic velocity fields on a fixed geometry. From these full-Stokes results, we propose a definition of enhancement factors for grounded ice and ice shelves, coherent with the asymptotic models used for these regions. We then estimate realistic values for the enhancement factors induced by ice anisotropy for grounded ice and ice shelves.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.3189/002214310794457209
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ice Sheets
ISSN: 0022-1430
NORA Subject Terms: Glaciology
Date made live: 04 Mar 2011 15:25
URI: http://nora.nerc.ac.uk/id/eprint/13719

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