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...
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ftcopernicus:oai:publications.copernicus.org:tc55461 2023-05-15T13:54:27+02:00 Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics Seddik, Hakime Greve, Ralf Zwinger, Thomas Sugiyama, Shin 2018-09-27 application/pdf https://doi.org/10.5194/tc-11-2213-2017 https://tc.copernicus.org/articles/11/2213/2017/ eng eng doi:10.5194/tc-11-2213-2017 https://tc.copernicus.org/articles/11/2213/2017/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-11-2213-2017 2020-07-20T16:23:36Z 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. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet Copernicus Publications: E-Journals Antarctic East Antarctica The Cryosphere 11 5 2213 2229 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
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 |
Text |
author |
Seddik, Hakime Greve, Ralf Zwinger, Thomas Sugiyama, Shin |
spellingShingle |
Seddik, Hakime Greve, Ralf Zwinger, Thomas Sugiyama, Shin Regional modeling of the Shirase drainage basin, East Antarctica: full Stokes vs. shallow ice dynamics |
author_facet |
Seddik, Hakime Greve, Ralf Zwinger, Thomas Sugiyama, Shin |
author_sort |
Seddik, Hakime |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-11-2213-2017 https://tc.copernicus.org/articles/11/2213/2017/ |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-11-2213-2017 https://tc.copernicus.org/articles/11/2213/2017/ |
op_doi |
https://doi.org/10.5194/tc-11-2213-2017 |
container_title |
The Cryosphere |
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11 |
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5 |
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2213 |
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2229 |
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1766260319395512320 |