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 anexisting ice thickness grid, using a fully two-dimensional finite difference scheme. The pattern of velocities over the ice sheet is presentedand compared with...
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ftawi:oai:epic.awi.de:3656 2024-09-15T17:39:58+00:00 A comparison of balance velocities, measured velocities, and thermomechanically modelled velocities for the Greenland ice sheet Bamber, J. L. Hardy, R. J. Huybrechts, Philippe Joughin, I. 2000 application/pdf https://epic.awi.de/id/eprint/3656/ https://epic.awi.de/id/eprint/3656/1/Bam2000a.pdf https://hdl.handle.net/10013/epic.14233 https://hdl.handle.net/10013/epic.14233.d001 unknown https://epic.awi.de/id/eprint/3656/1/Bam2000a.pdf https://hdl.handle.net/10013/epic.14233.d001 Bamber, J. L. , Hardy, R. J. , Huybrechts, P. and Joughin, I. (2000) A comparison of balance velocities, measured velocities, and thermomechanically modelled velocities for the Greenland ice sheet , Annals of Glaciology, 30 , pp. 211-216 . hdl:10013/epic.14233 EPIC3Annals of Glaciology, 30, pp. 211-216 Article isiRev 2000 ftawi 2024-06-24T03:54:11Z Balance velocities for the Greenland ice sheet have been calculated from a new digital elevation model, accumulation rates compilation and anexisting ice thickness grid, using a fully two-dimensional finite difference scheme. The pattern of velocities over the ice sheet is presentedand compared with velocities derived from synthetic aperture radar interferometry for part of northern Greenland and a limited number ofGPS data. This comparison indicated that the balance velocity scheme and boundary conditions used here provide a remarkably goodrepresantation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance velocity data couldprovide a valuable method of constraining a numerical ice sheet model. The balance velocities were compared with the diagnostic velocityfield 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 (greater than 300 km) ice stream in the north east is not generated by the numerical modeland much of the detailed flow pattern is completely lost due to the limited model resolution and limitations in the model physics. Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Balance velocities for the Greenland ice sheet have been calculated from a new digital elevation model, accumulation rates compilation and anexisting ice thickness grid, using a fully two-dimensional finite difference scheme. The pattern of velocities over the ice sheet is presentedand compared with velocities derived from synthetic aperture radar interferometry for part of northern Greenland and a limited number ofGPS data. This comparison indicated that the balance velocity scheme and boundary conditions used here provide a remarkably goodrepresantation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance velocity data couldprovide a valuable method of constraining a numerical ice sheet model. The balance velocities were compared with the diagnostic velocityfield 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 (greater than 300 km) ice stream in the north east is not generated by the numerical modeland much of the detailed flow pattern is completely lost due to the limited model resolution and limitations in the model physics. |
format |
Article in Journal/Newspaper |
author |
Bamber, J. L. Hardy, R. J. Huybrechts, Philippe Joughin, I. |
spellingShingle |
Bamber, J. L. Hardy, R. J. Huybrechts, Philippe Joughin, I. A comparison of balance velocities, measured velocities, and thermomechanically modelled velocities for the Greenland ice sheet |
author_facet |
Bamber, J. L. Hardy, R. J. Huybrechts, Philippe Joughin, I. |
author_sort |
Bamber, J. L. |
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://epic.awi.de/id/eprint/3656/ https://epic.awi.de/id/eprint/3656/1/Bam2000a.pdf https://hdl.handle.net/10013/epic.14233 https://hdl.handle.net/10013/epic.14233.d001 |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
EPIC3Annals of Glaciology, 30, pp. 211-216 |
op_relation |
https://epic.awi.de/id/eprint/3656/1/Bam2000a.pdf https://hdl.handle.net/10013/epic.14233.d001 Bamber, J. L. , Hardy, R. J. , Huybrechts, P. and Joughin, I. (2000) A comparison of balance velocities, measured velocities, and thermomechanically modelled velocities for the Greenland ice sheet , Annals of Glaciology, 30 , pp. 211-216 . hdl:10013/epic.14233 |
_version_ |
1810483757202800640 |