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Insights into ice stream dynamics through modelling their response to tidal forcing

Gudmundsson, G.H. and Rosier, S.H.R. and Green, M. (2014) Insights into ice stream dynamics through modelling their response to tidal forcing. The Cryosphere, 8. pp. 1763-1775. DOI: 10.5194/tc-8-1763-2014

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Abstract

The tidal forcing of ice streams at their ocean boundary can serve as a natural experiment to gain an insight into their dynamics and constrain the basal sliding law. A 3-D visco-elastic full Stokes model of coupled ice-stream ice-shelf flow is used to investigate the response of ice streams to ocean tides. In agreement with previous results based on flow-line modeling and with a fixed grounding line position, we find that a non-linear basal sliding law can reproduce long period modulation of tidal forcing found in field observations, and the inclusions of lateral effects and grounding line migration do not alter this result. Further analysis of modeled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a visco-elastic stress coupling length scale from ice stream equations that depends on the forcing period and closely agrees with model output.

Item Type: Article
Subjects: Research Publications
Departments: College of Natural Sciences > School of Ocean Sciences
Date Deposited: 24 Jul 2015 02:17
Last Modified: 19 Nov 2015 03:46
ISSN: 1994-0416
URI: http://e.bangor.ac.uk/id/eprint/4863
Identification Number: DOI: 10.5194/tc-8-1763-2014
Publisher: European Geosciences Union (EGU)
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