A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet
Balance velocities for the Greenland ice sheet have been calculated from a new digital-elevation model, accumulation-rates compilation and an existing ice-thickness grid, using a two-dimensional finite-difference scheme. The pattern of velocities over the ice sheet is presented and compared with vel...
Published in: | Annals of Glaciology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2000
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Online Access: | https://hdl.handle.net/1983/3ab4ff14-b508-4680-9eb4-22c4752be45f https://research-information.bris.ac.uk/en/publications/3ab4ff14-b508-4680-9eb4-22c4752be45f https://doi.org/10.3189/172756400781820589 http://bristol.library.ingentaconnect.com/content/igsoc/agl/2000/00000030/00000001/art00030 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/3ab4ff14-b508-4680-9eb4-22c4752be45f 2024-02-11T09:55:38+01:00 A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet Bamber, JL Hardy, RJ Huybrechts, P Joughin, I 2000-01 https://hdl.handle.net/1983/3ab4ff14-b508-4680-9eb4-22c4752be45f https://research-information.bris.ac.uk/en/publications/3ab4ff14-b508-4680-9eb4-22c4752be45f https://doi.org/10.3189/172756400781820589 http://bristol.library.ingentaconnect.com/content/igsoc/agl/2000/00000030/00000001/art00030 eng eng info:eu-repo/semantics/restrictedAccess Bamber , JL , Hardy , RJ , Huybrechts , P & Joughin , I 2000 , ' A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet ' , Annals of Glaciology , vol. 30 (1) , pp. 211 - 216 . https://doi.org/10.3189/172756400781820589 article 2000 ftubristolcris https://doi.org/10.3189/172756400781820589 2024-01-25T23:28:55Z Balance velocities for the Greenland ice sheet have been calculated from a new digital-elevation model, accumulation-rates compilation and an existing ice-thickness grid, using a two-dimensional finite-difference scheme. The pattern of velocities over the ice sheet is presented and compared with velocities derived from synthetic-aperture-radar interferometry for part of northern Greenland and a limited number of global positioning system data. This comparison indicated that the balance-velocity scheme and boundary conditions used here provide a remarkably good representation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance-velocity data could provide a valuable method of constraining a numerical ice-sheet model. The balance velocities were compared with the diagnostic velocity field calculated from several different configurations of a numerical ice-sheet model. The general pattern of flow agrees well. The detail, however, is quite different. For example, the large (>300 km) ice stream in the northeast is not generated by the numerical model and much of the detailed flow pattern is completely lost due to the limited model resolution and limitations in the model physics. Balance velocities for the Greenland ice sheet have been calculated from a new digital-elevation model, accumulation-rates compilation and an existing ice-thickness grid, using a two-dimensional finite-difference scheme. The pattern of velocities over the ice sheet is presented and compared with velocities derived from synthetic-aperture-radar interferometry for part of northern Greenland and a limited number of global positioning system data. This comparison indicated that the balance-velocity scheme and boundary conditions used here provide a remarkably good representation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance-velocity data could provide a valuable method of constraining a numerical ice-sheet model. The balance ... Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet University of Bristol: Bristol Research Greenland Annals of Glaciology 30 211 216 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Balance velocities for the Greenland ice sheet have been calculated from a new digital-elevation model, accumulation-rates compilation and an existing ice-thickness grid, using a two-dimensional finite-difference scheme. The pattern of velocities over the ice sheet is presented and compared with velocities derived from synthetic-aperture-radar interferometry for part of northern Greenland and a limited number of global positioning system data. This comparison indicated that the balance-velocity scheme and boundary conditions used here provide a remarkably good representation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance-velocity data could provide a valuable method of constraining a numerical ice-sheet model. The balance velocities were compared with the diagnostic velocity field calculated from several different configurations of a numerical ice-sheet model. The general pattern of flow agrees well. The detail, however, is quite different. For example, the large (>300 km) ice stream in the northeast is not generated by the numerical model and much of the detailed flow pattern is completely lost due to the limited model resolution and limitations in the model physics. Balance velocities for the Greenland ice sheet have been calculated from a new digital-elevation model, accumulation-rates compilation and an existing ice-thickness grid, using a two-dimensional finite-difference scheme. The pattern of velocities over the ice sheet is presented and compared with velocities derived from synthetic-aperture-radar interferometry for part of northern Greenland and a limited number of global positioning system data. This comparison indicated that the balance-velocity scheme and boundary conditions used here provide a remarkably good representation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance-velocity data could provide a valuable method of constraining a numerical ice-sheet model. The balance ... |
format |
Article in Journal/Newspaper |
author |
Bamber, JL Hardy, RJ Huybrechts, P Joughin, I |
spellingShingle |
Bamber, JL Hardy, RJ Huybrechts, P Joughin, I A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet |
author_facet |
Bamber, JL Hardy, RJ Huybrechts, P Joughin, I |
author_sort |
Bamber, JL |
title |
A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet |
title_short |
A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet |
title_full |
A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet |
title_fullStr |
A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet |
title_full_unstemmed |
A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet |
title_sort |
comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the greenland ice sheet |
publishDate |
2000 |
url |
https://hdl.handle.net/1983/3ab4ff14-b508-4680-9eb4-22c4752be45f https://research-information.bris.ac.uk/en/publications/3ab4ff14-b508-4680-9eb4-22c4752be45f https://doi.org/10.3189/172756400781820589 http://bristol.library.ingentaconnect.com/content/igsoc/agl/2000/00000030/00000001/art00030 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
Bamber , JL , Hardy , RJ , Huybrechts , P & Joughin , I 2000 , ' A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet ' , Annals of Glaciology , vol. 30 (1) , pp. 211 - 216 . https://doi.org/10.3189/172756400781820589 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3189/172756400781820589 |
container_title |
Annals of Glaciology |
container_volume |
30 |
container_start_page |
211 |
op_container_end_page |
216 |
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1790597992665841664 |