Ice sheet flow with thermally activated sliding. Part 1: the role of advection
Flow organization into systems of fast-moving ice streams is a well-known feature of ice sheets. Fast motion is frequently the result of sliding at the base of the ice sheet. Here, we consider how this basal sliding is first initiated as the result of changes in bed temperature. We show that an abru...
Published in: | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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crroyalsociety:10.1098/rspa.2019.0410 2024-06-23T07:53:45+00:00 Ice sheet flow with thermally activated sliding. Part 1: the role of advection Mantelli, E. Haseloff, M. Schoof, C. Natural Sciences and Engineering Research Council of Canada 2019 http://dx.doi.org/10.1098/rspa.2019.0410 https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2019.0410 https://royalsocietypublishing.org/doi/full-xml/10.1098/rspa.2019.0410 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 475, issue 2230, page 20190410 ISSN 1364-5021 1471-2946 journal-article 2019 crroyalsociety https://doi.org/10.1098/rspa.2019.0410 2024-06-04T06:22:58Z Flow organization into systems of fast-moving ice streams is a well-known feature of ice sheets. Fast motion is frequently the result of sliding at the base of the ice sheet. Here, we consider how this basal sliding is first initiated as the result of changes in bed temperature. We show that an abrupt sliding onset at the melting point, with no sliding possible below that temperature, leads to rapid drawdown of cold ice and refreezing as the result of the increased temperature gradient within the ice, and demonstrate that this result holds regardless of the mechanical model used to describe the flow of ice. Using this as a motivation, we then consider the possibility of a region of ‘subtemperate sliding’ in which sliding at reduced velocities occurs in a narrow range of temperatures just below the melting point. We confirm that this prevents the rapid drawdown of ice and refreezing of the bed, and construct a simple numerical method for computing steady-state ice sheet profiles that include a subtemperate region. The stability of such an ice sheet is analysed in a companion paper. Article in Journal/Newspaper Ice Sheet The Royal Society Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475 2230 20190410 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
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English |
description |
Flow organization into systems of fast-moving ice streams is a well-known feature of ice sheets. Fast motion is frequently the result of sliding at the base of the ice sheet. Here, we consider how this basal sliding is first initiated as the result of changes in bed temperature. We show that an abrupt sliding onset at the melting point, with no sliding possible below that temperature, leads to rapid drawdown of cold ice and refreezing as the result of the increased temperature gradient within the ice, and demonstrate that this result holds regardless of the mechanical model used to describe the flow of ice. Using this as a motivation, we then consider the possibility of a region of ‘subtemperate sliding’ in which sliding at reduced velocities occurs in a narrow range of temperatures just below the melting point. We confirm that this prevents the rapid drawdown of ice and refreezing of the bed, and construct a simple numerical method for computing steady-state ice sheet profiles that include a subtemperate region. The stability of such an ice sheet is analysed in a companion paper. |
author2 |
Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Mantelli, E. Haseloff, M. Schoof, C. |
spellingShingle |
Mantelli, E. Haseloff, M. Schoof, C. Ice sheet flow with thermally activated sliding. Part 1: the role of advection |
author_facet |
Mantelli, E. Haseloff, M. Schoof, C. |
author_sort |
Mantelli, E. |
title |
Ice sheet flow with thermally activated sliding. Part 1: the role of advection |
title_short |
Ice sheet flow with thermally activated sliding. Part 1: the role of advection |
title_full |
Ice sheet flow with thermally activated sliding. Part 1: the role of advection |
title_fullStr |
Ice sheet flow with thermally activated sliding. Part 1: the role of advection |
title_full_unstemmed |
Ice sheet flow with thermally activated sliding. Part 1: the role of advection |
title_sort |
ice sheet flow with thermally activated sliding. part 1: the role of advection |
publisher |
The Royal Society |
publishDate |
2019 |
url |
http://dx.doi.org/10.1098/rspa.2019.0410 https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2019.0410 https://royalsocietypublishing.org/doi/full-xml/10.1098/rspa.2019.0410 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 475, issue 2230, page 20190410 ISSN 1364-5021 1471-2946 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspa.2019.0410 |
container_title |
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
475 |
container_issue |
2230 |
container_start_page |
20190410 |
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1802645565236838400 |