Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics
A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the m...
Published in: | The Cryosphere |
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2017
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fttriple:oai:gotriple.eu:oai:doaj.org/article:40213881ebe442d09a7cd915db293ecf 2023-05-15T13:43:23+02:00 Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics H. Seddik R. Greve T. Zwinger S. Sugiyama 2017-09-01 https://doi.org/10.5194/tc-11-2213-2017 https://www.the-cryosphere.net/11/2213/2017/tc-11-2213-2017.pdf https://doaj.org/article/40213881ebe442d09a7cd915db293ecf en eng Copernicus Publications doi:10.5194/tc-11-2213-2017 1994-0416 1994-0424 https://www.the-cryosphere.net/11/2213/2017/tc-11-2213-2017.pdf https://doaj.org/article/40213881ebe442d09a7cd915db293ecf undefined The Cryosphere, Vol 11, Pp 2213-2229 (2017) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/tc-11-2213-2017 2023-01-22T19:07:25Z A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the model to the East Antarctic Shirase drainage basin. First, we apply the control inverse method to infer the distribution of basal friction with FS. We then compare FS and SIA by simulating the flow of the drainage basin under present-day conditions and for three scenarios 100 years into the future defined by the SeaRISE (Sea-level Response to Ice Sheet Evolution) project. FS reproduces the observed flow pattern of the drainage basin well, in particular the zone of fast flow near the grounding line, while SIA generally overpredicts the surface velocities. As for the transient scenarios, the ice volume change (relative to the constant-climate control run) of the surface climate experiment is nearly the same for FS and SIA, while for the basal sliding experiment (halved basal friction), the ice volume change is ∼ 30 % larger for SIA than for FS. This confirms findings of earlier studies that, in order to model ice sheet areas containing ice streams and outlet glaciers with high resolution and precision, careful consideration must be given to the choice of a suitable force balance. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet The Cryosphere Unknown Antarctic East Antarctica The Cryosphere 11 5 2213 2229 |
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geo envir H. Seddik R. Greve T. Zwinger S. Sugiyama Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
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geo envir |
description |
A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the model to the East Antarctic Shirase drainage basin. First, we apply the control inverse method to infer the distribution of basal friction with FS. We then compare FS and SIA by simulating the flow of the drainage basin under present-day conditions and for three scenarios 100 years into the future defined by the SeaRISE (Sea-level Response to Ice Sheet Evolution) project. FS reproduces the observed flow pattern of the drainage basin well, in particular the zone of fast flow near the grounding line, while SIA generally overpredicts the surface velocities. As for the transient scenarios, the ice volume change (relative to the constant-climate control run) of the surface climate experiment is nearly the same for FS and SIA, while for the basal sliding experiment (halved basal friction), the ice volume change is ∼ 30 % larger for SIA than for FS. This confirms findings of earlier studies that, in order to model ice sheet areas containing ice streams and outlet glaciers with high resolution and precision, careful consideration must be given to the choice of a suitable force balance. |
format |
Article in Journal/Newspaper |
author |
H. Seddik R. Greve T. Zwinger S. Sugiyama |
author_facet |
H. Seddik R. Greve T. Zwinger S. Sugiyama |
author_sort |
H. Seddik |
title |
Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
title_short |
Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
title_full |
Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
title_fullStr |
Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
title_full_unstemmed |
Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
title_sort |
regional modeling of the shirase drainage basin, east antarctica: full stokes vs. shallow ice dynamics |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-2213-2017 https://www.the-cryosphere.net/11/2213/2017/tc-11-2213-2017.pdf https://doaj.org/article/40213881ebe442d09a7cd915db293ecf |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 11, Pp 2213-2229 (2017) |
op_relation |
doi:10.5194/tc-11-2213-2017 1994-0416 1994-0424 https://www.the-cryosphere.net/11/2213/2017/tc-11-2213-2017.pdf https://doaj.org/article/40213881ebe442d09a7cd915db293ecf |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-11-2213-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
5 |
container_start_page |
2213 |
op_container_end_page |
2229 |
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1766188152156848128 |