Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model
Ice sheets and ice shelves are linked by the transition zone, the region where flow dominated by vertical shear stress makes a transition to flow dominated by extensional stress. Adequate resolution of the transition zone is necessary for numerically accurate ice sheet–ice shelf simulations. The req...
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2014
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ftdatacite:10.34657/1180 2023-05-15T16:39:57+02:00 Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model Leguy, G.R. Asay-Davis, X.S. Lipscomb, W.H. 2014 application/pdf https://dx.doi.org/10.34657/1180 https://oa.tib.eu/renate/handle/123456789/683 en eng München : European Geopyhsical Union Creative Commons Attribution 3.0 Unported CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY 550 CreativeWork article 2014 ftdatacite https://doi.org/10.34657/1180 2022-03-10T12:43:22Z Ice sheets and ice shelves are linked by the transition zone, the region where flow dominated by vertical shear stress makes a transition to flow dominated by extensional stress. Adequate resolution of the transition zone is necessary for numerically accurate ice sheet–ice shelf simulations. The required resolution depends on how the basal physics is parameterized. We propose a~new, simple parameterization of the effective pressure near the grounding line, combined with an existing friction law linking effective pressure to basal stress and sliding, in a one-dimensional, fixed-grid, vertically integrated model. This parameterization represents connectivity between the basal hydrological system and the ocean in the transition zone. Our model produces a smooth transition between finite basal friction in the ice sheet and zero basal friction in the ice shelf. In a set of experiments based on the Marine Ice Sheet Model Intercomparison Project (MISMIP), we show that with a smoother basal shear stress, the model yields accurate steady-state results at a fixed-grid resolution of ~1 km. Article in Journal/Newspaper Ice Sheet Ice Shelf Ice Shelves DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
550 |
spellingShingle |
550 Leguy, G.R. Asay-Davis, X.S. Lipscomb, W.H. Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
topic_facet |
550 |
description |
Ice sheets and ice shelves are linked by the transition zone, the region where flow dominated by vertical shear stress makes a transition to flow dominated by extensional stress. Adequate resolution of the transition zone is necessary for numerically accurate ice sheet–ice shelf simulations. The required resolution depends on how the basal physics is parameterized. We propose a~new, simple parameterization of the effective pressure near the grounding line, combined with an existing friction law linking effective pressure to basal stress and sliding, in a one-dimensional, fixed-grid, vertically integrated model. This parameterization represents connectivity between the basal hydrological system and the ocean in the transition zone. Our model produces a smooth transition between finite basal friction in the ice sheet and zero basal friction in the ice shelf. In a set of experiments based on the Marine Ice Sheet Model Intercomparison Project (MISMIP), we show that with a smoother basal shear stress, the model yields accurate steady-state results at a fixed-grid resolution of ~1 km. |
format |
Article in Journal/Newspaper |
author |
Leguy, G.R. Asay-Davis, X.S. Lipscomb, W.H. |
author_facet |
Leguy, G.R. Asay-Davis, X.S. Lipscomb, W.H. |
author_sort |
Leguy, G.R. |
title |
Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
title_short |
Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
title_full |
Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
title_fullStr |
Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
title_full_unstemmed |
Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
title_sort |
parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
publisher |
München : European Geopyhsical Union |
publishDate |
2014 |
url |
https://dx.doi.org/10.34657/1180 https://oa.tib.eu/renate/handle/123456789/683 |
genre |
Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Ice Sheet Ice Shelf Ice Shelves |
op_rights |
Creative Commons Attribution 3.0 Unported CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.34657/1180 |
_version_ |
1766030309719015424 |