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

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          Abstract

          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.

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          Most cited references18

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          Large-scale ice flow over a viscous basal sediment: Theory and application to ice stream B, Antarctica

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            Textures and fabrics in the GRIP ice core

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              Distribution of marine ice beneath the Amery Ice Shelf

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                Author and article information

                Journal
                applab
                Journal of Glaciology
                J. Glaciology.
                Cambridge University Press (CUP)
                0022-1430
                1727-5652
                2010
                September 8 2017
                2010
                : 56
                : 199
                : 805-812
                Article
                10.3189/002214310794457209
                a28c4540-d834-4c59-b1fb-a32f1ec702a3
                © 2010
                History

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