Stress balances of ice streams in a vertically integrated, higher-order formulation
peer-reviewed One challenge in improving our understanding of ice-stream dynamics is to develop models of the spatial and temporal transition from ice-sheet to ice-stream flow. We address this with a new, vertically integrated, higher-order formulation for ice-sheet dynamics that captures the leadin...
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ftunivlimerick:oai:ulir.ul.ie:10344/4547 2023-05-15T14:03:30+02:00 Stress balances of ice streams in a vertically integrated, higher-order formulation Kyrke-Smith, T.M. Katz, R.F Fowler, Andrew C. 2015-07-21T13:57:53Z http://hdl.handle.net/10344/4547 eng eng International Glaciological Society Journal of Glaciology;519, (215), pp. 449-466 http://dx.doi.org/10.3189/2013JoG12J140 http://hdl.handle.net/10344/4547 info:eu-repo/semantics/openAccess glacier surge mechanism sheet model pism West Antarctica till deformation info:eu-repo/semantics/article all_ul_research ul_published_reviewed 2015 ftunivlimerick https://doi.org/10.3189/2013JoG12J140 2022-05-23T15:13:32Z peer-reviewed One challenge in improving our understanding of ice-stream dynamics is to develop models of the spatial and temporal transition from ice-sheet to ice-stream flow. We address this with a new, vertically integrated, higher-order formulation for ice-sheet dynamics that captures the leading-order physics of low aspect ratio, viscous fluid flow, regardless of the amount of slip at the bed. The theory introduces a parameter, lambda, which approximates the ratio of the basal stress to the shear stress scale, providing a measure of the relative importance of sliding and internal deformation. Our model is able to simultaneously describe the dynamics of both a slow-moving sheet and rapidly flowing ice streams. To test the formulation, we apply a triple-valued sliding law as the basal boundary condition and obtain numerical solutions that can be compared with previous work. We investigate the sensitivity of flow regimes and shear margin width to parameter variation, deriving a scaling for the latter. We also consider a double-valued sliding law, which enforces a constant, low basal stress beneath the ice stream. Comparisons of the resultant stress fields illustrate the different stress balances that can maintain ice-stream flow. PUBLISHED peer-reviewed Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Journal of Glaciology West Antarctica University of Limerick: Institutional Repository (ULIR) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) West Antarctica Journal of Glaciology 59 215 449 466 |
institution |
Open Polar |
collection |
University of Limerick: Institutional Repository (ULIR) |
op_collection_id |
ftunivlimerick |
language |
English |
topic |
glacier surge mechanism sheet model pism West Antarctica till deformation |
spellingShingle |
glacier surge mechanism sheet model pism West Antarctica till deformation Kyrke-Smith, T.M. Katz, R.F Fowler, Andrew C. Stress balances of ice streams in a vertically integrated, higher-order formulation |
topic_facet |
glacier surge mechanism sheet model pism West Antarctica till deformation |
description |
peer-reviewed One challenge in improving our understanding of ice-stream dynamics is to develop models of the spatial and temporal transition from ice-sheet to ice-stream flow. We address this with a new, vertically integrated, higher-order formulation for ice-sheet dynamics that captures the leading-order physics of low aspect ratio, viscous fluid flow, regardless of the amount of slip at the bed. The theory introduces a parameter, lambda, which approximates the ratio of the basal stress to the shear stress scale, providing a measure of the relative importance of sliding and internal deformation. Our model is able to simultaneously describe the dynamics of both a slow-moving sheet and rapidly flowing ice streams. To test the formulation, we apply a triple-valued sliding law as the basal boundary condition and obtain numerical solutions that can be compared with previous work. We investigate the sensitivity of flow regimes and shear margin width to parameter variation, deriving a scaling for the latter. We also consider a double-valued sliding law, which enforces a constant, low basal stress beneath the ice stream. Comparisons of the resultant stress fields illustrate the different stress balances that can maintain ice-stream flow. PUBLISHED peer-reviewed |
format |
Article in Journal/Newspaper |
author |
Kyrke-Smith, T.M. Katz, R.F Fowler, Andrew C. |
author_facet |
Kyrke-Smith, T.M. Katz, R.F Fowler, Andrew C. |
author_sort |
Kyrke-Smith, T.M. |
title |
Stress balances of ice streams in a vertically integrated, higher-order formulation |
title_short |
Stress balances of ice streams in a vertically integrated, higher-order formulation |
title_full |
Stress balances of ice streams in a vertically integrated, higher-order formulation |
title_fullStr |
Stress balances of ice streams in a vertically integrated, higher-order formulation |
title_full_unstemmed |
Stress balances of ice streams in a vertically integrated, higher-order formulation |
title_sort |
stress balances of ice streams in a vertically integrated, higher-order formulation |
publisher |
International Glaciological Society |
publishDate |
2015 |
url |
http://hdl.handle.net/10344/4547 |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Lambda West Antarctica |
geographic_facet |
Lambda West Antarctica |
genre |
Antarc* Antarctica Ice Sheet Journal of Glaciology West Antarctica |
genre_facet |
Antarc* Antarctica Ice Sheet Journal of Glaciology West Antarctica |
op_relation |
Journal of Glaciology;519, (215), pp. 449-466 http://dx.doi.org/10.3189/2013JoG12J140 http://hdl.handle.net/10344/4547 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/2013JoG12J140 |
container_title |
Journal of Glaciology |
container_volume |
59 |
container_issue |
215 |
container_start_page |
449 |
op_container_end_page |
466 |
_version_ |
1766274181967642624 |