A dynamical model of Kara Sea land-fast ice
This paper introduces modifications to the traditional viscous-plastic sea-ice dynamical model, which are necessary to model land-fast ice in the Kara Sea in a realistic manner. The most important modifications are an increase in the maximum viscosity from the standard value of C-max = (2.5x10(8)s)P...
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ftpubman:oai:pure.mpg.de:item_2351970 2023-08-20T04:07:41+02:00 A dynamical model of Kara Sea land-fast ice Olason, E. 2016-05 application/pdf http://hdl.handle.net/11858/00-001M-0000-002B-9B1C-2 http://hdl.handle.net/11858/00-001M-0000-002B-9B21-3 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC011638 http://hdl.handle.net/11858/00-001M-0000-002B-9B1C-2 http://hdl.handle.net/11858/00-001M-0000-002B-9B21-3 info:eu-repo/semantics/openAccess Journal of Geophysical Research: Oceans info:eu-repo/semantics/article 2016 ftpubman https://doi.org/10.1002/2016JC011638 2023-08-01T22:48:15Z This paper introduces modifications to the traditional viscous-plastic sea-ice dynamical model, which are necessary to model land-fast ice in the Kara Sea in a realistic manner. The most important modifications are an increase in the maximum viscosity from the standard value of C-max = (2.5x10(8)s)P to zeta(max)=(10(13)5)P, and to use a solver for the momentum equation capable of correctly solving for small ice velocities (the limit here is set to 10(-4) m/s). Given these modifications, a necessary condition for a realistic fast-ice simulation is that the yield curve give sufficient uniaxial compressive strength. This is consistent with the idea that land-fast ice in the Kara Sea forms primarily via static arching. The modified model is tested and tuned using forcing data and observations from 1997 and 1998. The results show that it is possible to model land-fast ice using this model with the modifications mentioned above. The model performs well in terms of modeled fast-ice extent, but suffers from unrealistic break-ups during the start and end of the fast-ice season. The main results are that fast ice in the Kara Sea is supported by arching of the ice, the arches footers resting on a chain of islands off shore. Article in Journal/Newspaper Kara Sea Sea ice Max Planck Society: MPG.PuRe Kara Sea The Arches ENVELOPE(-57.665,-57.665,50.100,50.100) Journal of Geophysical Research: Oceans 121 5 3141 3158 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
This paper introduces modifications to the traditional viscous-plastic sea-ice dynamical model, which are necessary to model land-fast ice in the Kara Sea in a realistic manner. The most important modifications are an increase in the maximum viscosity from the standard value of C-max = (2.5x10(8)s)P to zeta(max)=(10(13)5)P, and to use a solver for the momentum equation capable of correctly solving for small ice velocities (the limit here is set to 10(-4) m/s). Given these modifications, a necessary condition for a realistic fast-ice simulation is that the yield curve give sufficient uniaxial compressive strength. This is consistent with the idea that land-fast ice in the Kara Sea forms primarily via static arching. The modified model is tested and tuned using forcing data and observations from 1997 and 1998. The results show that it is possible to model land-fast ice using this model with the modifications mentioned above. The model performs well in terms of modeled fast-ice extent, but suffers from unrealistic break-ups during the start and end of the fast-ice season. The main results are that fast ice in the Kara Sea is supported by arching of the ice, the arches footers resting on a chain of islands off shore. |
format |
Article in Journal/Newspaper |
author |
Olason, E. |
spellingShingle |
Olason, E. A dynamical model of Kara Sea land-fast ice |
author_facet |
Olason, E. |
author_sort |
Olason, E. |
title |
A dynamical model of Kara Sea land-fast ice |
title_short |
A dynamical model of Kara Sea land-fast ice |
title_full |
A dynamical model of Kara Sea land-fast ice |
title_fullStr |
A dynamical model of Kara Sea land-fast ice |
title_full_unstemmed |
A dynamical model of Kara Sea land-fast ice |
title_sort |
dynamical model of kara sea land-fast ice |
publishDate |
2016 |
url |
http://hdl.handle.net/11858/00-001M-0000-002B-9B1C-2 http://hdl.handle.net/11858/00-001M-0000-002B-9B21-3 |
long_lat |
ENVELOPE(-57.665,-57.665,50.100,50.100) |
geographic |
Kara Sea The Arches |
geographic_facet |
Kara Sea The Arches |
genre |
Kara Sea Sea ice |
genre_facet |
Kara Sea Sea ice |
op_source |
Journal of Geophysical Research: Oceans |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC011638 http://hdl.handle.net/11858/00-001M-0000-002B-9B1C-2 http://hdl.handle.net/11858/00-001M-0000-002B-9B21-3 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016JC011638 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
5 |
container_start_page |
3141 |
op_container_end_page |
3158 |
_version_ |
1774719493788925952 |