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...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2014
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-8-1239-2014 https://doaj.org/article/307e2d496f514b9f80d994396c7461ef |
id |
ftdoajarticles:oai:doaj.org/article:307e2d496f514b9f80d994396c7461ef |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:307e2d496f514b9f80d994396c7461ef 2023-05-15T16:39:58+02:00 Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model G. R. Leguy X. S. Asay-Davis W. H. Lipscomb 2014-07-01T00:00:00Z https://doi.org/10.5194/tc-8-1239-2014 https://doaj.org/article/307e2d496f514b9f80d994396c7461ef EN eng Copernicus Publications http://www.the-cryosphere.net/8/1239/2014/tc-8-1239-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1239-2014 https://doaj.org/article/307e2d496f514b9f80d994396c7461ef The Cryosphere, Vol 8, Iss 4, Pp 1239-1259 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-1239-2014 2023-01-08T01:28:57Z 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 The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 8 4 1239 1259 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 G. R. Leguy X. S. Asay-Davis W. H. Lipscomb Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
G. R. Leguy X. S. Asay-Davis W. H. Lipscomb |
author_facet |
G. R. Leguy X. S. Asay-Davis W. H. Lipscomb |
author_sort |
G. R. Leguy |
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 |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1239-2014 https://doaj.org/article/307e2d496f514b9f80d994396c7461ef |
genre |
Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 4, Pp 1239-1259 (2014) |
op_relation |
http://www.the-cryosphere.net/8/1239/2014/tc-8-1239-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1239-2014 https://doaj.org/article/307e2d496f514b9f80d994396c7461ef |
op_doi |
https://doi.org/10.5194/tc-8-1239-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1239 |
op_container_end_page |
1259 |
_version_ |
1766030314691362816 |