Insights into ice stream dynamics through modelling their response to tidal forcing
The tidal forcing of ice streams at their ocean boundary can serve as a natural experiment to gain an insight into their dynamics and constrain the basal sliding law. A nonlinear 3-D viscoelastic full Stokes model of coupled ice stream ice shelf flow is used to investigate the response of ice stream...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2014
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00018894 2023-05-15T16:41:54+02:00 Insights into ice stream dynamics through modelling their response to tidal forcing Rosier, S. H. R. Gudmundsson, G. H. Green, J. A. M. 2014-09 electronic https://doi.org/10.5194/tc-8-1763-2014 https://noa.gwlb.de/receive/cop_mods_00018894 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018849/tc-8-1763-2014.pdf https://tc.copernicus.org/articles/8/1763/2014/tc-8-1763-2014.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-8-1763-2014 https://noa.gwlb.de/receive/cop_mods_00018894 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018849/tc-8-1763-2014.pdf https://tc.copernicus.org/articles/8/1763/2014/tc-8-1763-2014.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2014 ftnonlinearchiv https://doi.org/10.5194/tc-8-1763-2014 2022-02-08T22:52:55Z The tidal forcing of ice streams at their ocean boundary can serve as a natural experiment to gain an insight into their dynamics and constrain the basal sliding law. A nonlinear 3-D viscoelastic full Stokes model of coupled ice stream ice shelf flow is used to investigate the response of ice streams to ocean tides. In agreement with previous results based on flow-line modelling and with a fixed grounding line position, we find that a nonlinear basal sliding law can qualitatively reproduce long-period modulation of tidal forcing found in field observations. In addition, we show that the inclusion of lateral drag, or allowing the grounding line to migrate over the tidal cycle, does not affect these conclusions. Further analysis of modelled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a viscoelastic stress-coupling length scale from ice stream equations that depends on the forcing period and closely agrees with model output. Article in Journal/Newspaper Ice Shelf The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 8 5 1763 1775 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Rosier, S. H. R. Gudmundsson, G. H. Green, J. A. M. Insights into ice stream dynamics through modelling their response to tidal forcing |
topic_facet |
article Verlagsveröffentlichung |
description |
The tidal forcing of ice streams at their ocean boundary can serve as a natural experiment to gain an insight into their dynamics and constrain the basal sliding law. A nonlinear 3-D viscoelastic full Stokes model of coupled ice stream ice shelf flow is used to investigate the response of ice streams to ocean tides. In agreement with previous results based on flow-line modelling and with a fixed grounding line position, we find that a nonlinear basal sliding law can qualitatively reproduce long-period modulation of tidal forcing found in field observations. In addition, we show that the inclusion of lateral drag, or allowing the grounding line to migrate over the tidal cycle, does not affect these conclusions. Further analysis of modelled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a viscoelastic stress-coupling length scale from ice stream equations that depends on the forcing period and closely agrees with model output. |
format |
Article in Journal/Newspaper |
author |
Rosier, S. H. R. Gudmundsson, G. H. Green, J. A. M. |
author_facet |
Rosier, S. H. R. Gudmundsson, G. H. Green, J. A. M. |
author_sort |
Rosier, S. H. R. |
title |
Insights into ice stream dynamics through modelling their response to tidal forcing |
title_short |
Insights into ice stream dynamics through modelling their response to tidal forcing |
title_full |
Insights into ice stream dynamics through modelling their response to tidal forcing |
title_fullStr |
Insights into ice stream dynamics through modelling their response to tidal forcing |
title_full_unstemmed |
Insights into ice stream dynamics through modelling their response to tidal forcing |
title_sort |
insights into ice stream dynamics through modelling their response to tidal forcing |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1763-2014 https://noa.gwlb.de/receive/cop_mods_00018894 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018849/tc-8-1763-2014.pdf https://tc.copernicus.org/articles/8/1763/2014/tc-8-1763-2014.pdf |
genre |
Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-8-1763-2014 https://noa.gwlb.de/receive/cop_mods_00018894 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018849/tc-8-1763-2014.pdf https://tc.copernicus.org/articles/8/1763/2014/tc-8-1763-2014.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-8-1763-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
5 |
container_start_page |
1763 |
op_container_end_page |
1775 |
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1766032368532979712 |