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 |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2014
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-8-1763-2014 http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.pdf https://doaj.org/article/2689d2461596447cb58b90202890c3a3 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:2689d2461596447cb58b90202890c3a3 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:2689d2461596447cb58b90202890c3a3 2023-05-15T16:41:54+02:00 Insights into ice stream dynamics through modelling their response to tidal forcing S. H. R. Rosier G. H. Gudmundsson J. A. M. Green 2014-09-01 https://doi.org/10.5194/tc-8-1763-2014 http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.pdf https://doaj.org/article/2689d2461596447cb58b90202890c3a3 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-8-1763-2014 http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.pdf https://doaj.org/article/2689d2461596447cb58b90202890c3a3 undefined The Cryosphere, Vol 8, Iss 5, Pp 1763-1775 (2014) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2014 fttriple https://doi.org/10.5194/tc-8-1763-2014 2023-01-22T19:13:43Z 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 Unknown The Cryosphere 8 5 1763 1775 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo S. H. R. Rosier G. H. Gudmundsson J. A. M. Green Insights into ice stream dynamics through modelling their response to tidal forcing |
topic_facet |
envir geo |
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 |
S. H. R. Rosier G. H. Gudmundsson J. A. M. Green |
author_facet |
S. H. R. Rosier G. H. Gudmundsson J. A. M. Green |
author_sort |
S. H. R. Rosier |
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 http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.pdf https://doaj.org/article/2689d2461596447cb58b90202890c3a3 |
genre |
Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 5, Pp 1763-1775 (2014) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-8-1763-2014 http://www.the-cryosphere.net/8/1763/2014/tc-8-1763-2014.pdf https://doaj.org/article/2689d2461596447cb58b90202890c3a3 |
op_rights |
undefined |
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_ |
1766032368707043328 |