Influence of geometrical boundary conditions on the estimation of rheological parameters

Improved knowledge of geometrical boundary conditions, such as bedrock geometry and surface topography, can contribute significantly to glaciological studies including ice-sheet-flow modelling. Precise thickness and altimetric data allow an estimation of ice-flow direction, the balance velocity and...

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Bibliographic Details
Main Authors: Testut, L., Tabacco, I. E., Bianchi, C., Rémy, F.
Other Authors: Testut, L.; UMR5566, Groupe de Recherche de Géodésie Spatiale, CNES-CNRS, Toulouse Cedex 31055, France, Tabacco, I. E.; Dipartimento di Scienze della Terra, Università degli Studi di Milano, I-20129 Milan, Italy, Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Rémy, F.; UMR5566, Groupe de Recherche de Géodésie Spatiale, CNES-CNRS, Toulouse Cedex 31055, France, UMR5566, Groupe de Recherche de Géodésie Spatiale, CNES-CNRS, Toulouse Cedex 31055, France, Dipartimento di Scienze della Terra, Università degli Studi di Milano, I-20129 Milan, Italy, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
Format: Article in Journal/Newspaper
Language:English
Published: International Glaciological Society 2000
Subjects:
Ice sheet
Mass balance
Bedrock-topography
02. Cryosphere::02.02. Glaciers::02.02.03. Geomorphology
02. Cryosphere::02.02. Glaciers::02.02.04. Ice
02. Cryosphere::02.02. Glaciers::02.02.05. Ice dynamics
East Antarctica
Annals of Glaciology
Antarc*
Antarctica
Ice Sheet
Online Access:http://hdl.handle.net/2122/4179
Description
Summary:Improved knowledge of geometrical boundary conditions, such as bedrock geometry and surface topography, can contribute significantly to glaciological studies including ice-sheet-flow modelling. Precise thickness and altimetric data allow an estimation of ice-flow direction, the balance velocity and the basal shear stress. These parameters are calculated along a 1160 km profile in East Antarctica using a relationship between shear stress, basal temperature, the Glen flow exponent and a parameter related to strain rate. Strong variations of the flow-law parameters and basal conditions are found to play a major role in the ice-flow pattern. Sliding, anisotropy and longitudinal stress strongly perturb the validity of the law, but their signature can be identified. Published 102-106 3.8. Geofisica per l'ambiente JCR Journal reserved

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