Influence of channelling on heating in ice-sheet flows

Hindmarsh, Richard C.A. ORCID: 2001 Influence of channelling on heating in ice-sheet flows. Geophysical Research Letters, 28 (19). 3681-3684.

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Ice‐sheet flows can be channelled by perturbations in the basal topography or in the sliding coefficient. These lead to spatial variation in the steady profile, the flux and the dissipative heating. This paper examines the linearized theory of heating variations, showing that the map plane aspect ratio of the basal perturbation has a dominating effect on the qualitative behaviour. For ribbing transverse to the direction of flow, maximum heating occurs over bedrock and sliding viscosity highs. When flow‐parallel channelling occurs maximum heating occurs over bedrock lows and sliding viscosity lows. These results are used to examine symmetry‐breaking behaviour of numerical thermoviscous ice‐sheet models in terms of a dissipation‐driven creep instability.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Global Interactions of the Antarctic Ice Sheet
ISSN: 0094-8276
Additional Information. Not used in RCUK Gateway to Research.: Not subject to U.S. copyright. Published 2001 American Geophysical Union. Further reproduction or electronic distribution is not permitted.
Date made live: 30 Aug 2012 14:11 +0 (UTC)

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