Insights into ice stream dynamics through modeling 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 3-D visco-elastic full Stokes model of coupled ice-stream ice-shelf flow is used to investigate the response of ice streams to ocea...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications on behalf of the European Geosciences Union
2014
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ftnerc:oai:nora.nerc.ac.uk:504258 2023-05-15T16:41:54+02:00 Insights into ice stream dynamics through modeling their response to tidal forcing Rosier, S.H.R. Gudmundsson, G.H. Green, J.A.M. 2014-09-25 text http://nora.nerc.ac.uk/id/eprint/504258/ https://nora.nerc.ac.uk/id/eprint/504258/1/tc-8-1763-2014.pdf http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.html en eng Copernicus Publications on behalf of the European Geosciences Union https://nora.nerc.ac.uk/id/eprint/504258/1/tc-8-1763-2014.pdf Rosier, S.H.R. orcid:0000-0003-3047-9908 Gudmundsson, G.H. orcid:0000-0003-4236-5369 Green, J.A.M. 2014 Insights into ice stream dynamics through modeling their response to tidal forcing. The Cryosphere, 8 (5). 1763-1775. https://doi.org/10.5194/tc-8-1763-2014 <https://doi.org/10.5194/tc-8-1763-2014> cc_by CC-BY Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.5194/tc-8-1763-2014 2023-02-04T19:38:19Z 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 3-D visco-elastic 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 modeling and with a fixed grounding line position, we find that a non-linear basal sliding law can reproduce long period modulation of tidal forcing found in field observations, and the inclusions of lateral effects and grounding line migration do not alter this result. Further analysis of modeled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a visco-elastic 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 Natural Environment Research Council: NERC Open Research Archive The Cryosphere 8 5 1763 1775 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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 3-D visco-elastic 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 modeling and with a fixed grounding line position, we find that a non-linear basal sliding law can reproduce long period modulation of tidal forcing found in field observations, and the inclusions of lateral effects and grounding line migration do not alter this result. Further analysis of modeled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a visco-elastic 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. |
spellingShingle |
Rosier, S.H.R. Gudmundsson, G.H. Green, J.A.M. Insights into ice stream dynamics through modeling their response to tidal forcing |
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 modeling their response to tidal forcing |
title_short |
Insights into ice stream dynamics through modeling their response to tidal forcing |
title_full |
Insights into ice stream dynamics through modeling their response to tidal forcing |
title_fullStr |
Insights into ice stream dynamics through modeling their response to tidal forcing |
title_full_unstemmed |
Insights into ice stream dynamics through modeling their response to tidal forcing |
title_sort |
insights into ice stream dynamics through modeling their response to tidal forcing |
publisher |
Copernicus Publications on behalf of the European Geosciences Union |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/504258/ https://nora.nerc.ac.uk/id/eprint/504258/1/tc-8-1763-2014.pdf http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.html |
genre |
Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf The Cryosphere |
op_relation |
https://nora.nerc.ac.uk/id/eprint/504258/1/tc-8-1763-2014.pdf Rosier, S.H.R. orcid:0000-0003-3047-9908 Gudmundsson, G.H. orcid:0000-0003-4236-5369 Green, J.A.M. 2014 Insights into ice stream dynamics through modeling their response to tidal forcing. The Cryosphere, 8 (5). 1763-1775. https://doi.org/10.5194/tc-8-1763-2014 <https://doi.org/10.5194/tc-8-1763-2014> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
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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1766032369063559168 |