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...
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Online Access: | https://doi.org/10.5194/tc-8-1763-2014 https://tc.copernicus.org/articles/8/1763/2014/ |
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ftcopernicus:oai:publications.copernicus.org:tc23320 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. 2018-09-27 application/pdf https://doi.org/10.5194/tc-8-1763-2014 https://tc.copernicus.org/articles/8/1763/2014/ eng eng doi:10.5194/tc-8-1763-2014 https://tc.copernicus.org/articles/8/1763/2014/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-8-1763-2014 2020-07-20T16:24:55Z 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. Text Ice Shelf Copernicus Publications: E-Journals The Cryosphere 8 5 1763 1775 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
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 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 |
Text |
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 modelling 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 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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-8-1763-2014 https://tc.copernicus.org/articles/8/1763/2014/ |
genre |
Ice Shelf |
genre_facet |
Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-8-1763-2014 https://tc.copernicus.org/articles/8/1763/2014/ |
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 |
_version_ |
1766032369234477056 |