Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica
The distribution of basal traction on a transect along Pine Island Glacier, West Antarctica, is estimated by inverting observed surface velocities using a control method and a simple numerical stream-flow model. This model calculates the horizontal flow along a transect, based on the assumptions tha...
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International Glaciological Society
2003
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ftunivzuerich:oai:www.zora.uzh.ch:136283 2024-09-09T19:00:59+00:00 Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica Vieli, Andreas Payne, Antony J 2003 application/pdf https://www.zora.uzh.ch/id/eprint/136283/ https://www.zora.uzh.ch/id/eprint/136283/1/2003_vieli_payne_ag_2003.pdf https://doi.org/10.5167/uzh-136283 https://doi.org/10.3189/172756403781816338 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/136283/1/2003_vieli_payne_ag_2003.pdf doi:10.5167/uzh-136283 doi:10.3189/172756403781816338 urn:issn:0260-3055 info:eu-repo/semantics/openAccess Vieli, Andreas; Payne, Antony J (2003). Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica. Annals of Glaciology, 36(1):197-204. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2003 ftunivzuerich https://doi.org/10.5167/uzh-13628310.3189/172756403781816338 2024-08-21T00:19:56Z The distribution of basal traction on a transect along Pine Island Glacier, West Antarctica, is estimated by inverting observed surface velocities using a control method and a simple numerical stream-flow model. This model calculates the horizontal flow along a transect, based on the assumptions that the horizontal flow is independent of ice depth and that the driving stresses are balanced by resistive forces at the glacier bed and margin and by gradients in longitudinal stress. Basal traction is assumed to be linearly related to the basal velocity. For the lateral shear traction a parameterization based on an inversion of Glen's flow law is used. The application of the control method allows us to calculate the set of model parameters (e.g. the basal friction coefficient) that gives the best fit between modelled and observed surface velocities. The model is used to investigate the stress regime of Pine Island Glacier, in particular to estimate the importance of basal, lateral and longitudinal stresses relative to each other. In the flat region just behind the grounding line, basal drag, lateral drag and the longitudinal stress gradient are the same order of magnitude. In the steep region up-glacier from the grounding line, the driving stresses are highest and balanced predominantly by basal resistive stresses. Further upstream, in the trunk of the glacier, lateral and basal drag predominate. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Pine Island Pine Island Glacier West Antarctica University of Zurich (UZH): ZORA (Zurich Open Repository and Archive West Antarctica Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Vieli, Andreas Payne, Antony J Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
The distribution of basal traction on a transect along Pine Island Glacier, West Antarctica, is estimated by inverting observed surface velocities using a control method and a simple numerical stream-flow model. This model calculates the horizontal flow along a transect, based on the assumptions that the horizontal flow is independent of ice depth and that the driving stresses are balanced by resistive forces at the glacier bed and margin and by gradients in longitudinal stress. Basal traction is assumed to be linearly related to the basal velocity. For the lateral shear traction a parameterization based on an inversion of Glen's flow law is used. The application of the control method allows us to calculate the set of model parameters (e.g. the basal friction coefficient) that gives the best fit between modelled and observed surface velocities. The model is used to investigate the stress regime of Pine Island Glacier, in particular to estimate the importance of basal, lateral and longitudinal stresses relative to each other. In the flat region just behind the grounding line, basal drag, lateral drag and the longitudinal stress gradient are the same order of magnitude. In the steep region up-glacier from the grounding line, the driving stresses are highest and balanced predominantly by basal resistive stresses. Further upstream, in the trunk of the glacier, lateral and basal drag predominate. |
format |
Article in Journal/Newspaper |
author |
Vieli, Andreas Payne, Antony J |
author_facet |
Vieli, Andreas Payne, Antony J |
author_sort |
Vieli, Andreas |
title |
Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica |
title_short |
Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica |
title_full |
Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica |
title_fullStr |
Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica |
title_full_unstemmed |
Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica |
title_sort |
application of control methods for modelling the flow of pine island glacier, west antarctica |
publisher |
International Glaciological Society |
publishDate |
2003 |
url |
https://www.zora.uzh.ch/id/eprint/136283/ https://www.zora.uzh.ch/id/eprint/136283/1/2003_vieli_payne_ag_2003.pdf https://doi.org/10.5167/uzh-136283 https://doi.org/10.3189/172756403781816338 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
West Antarctica Pine Island Glacier |
geographic_facet |
West Antarctica Pine Island Glacier |
genre |
Annals of Glaciology Antarc* Antarctica Pine Island Pine Island Glacier West Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctica Pine Island Pine Island Glacier West Antarctica |
op_source |
Vieli, Andreas; Payne, Antony J (2003). Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica. Annals of Glaciology, 36(1):197-204. |
op_relation |
https://www.zora.uzh.ch/id/eprint/136283/1/2003_vieli_payne_ag_2003.pdf doi:10.5167/uzh-136283 doi:10.3189/172756403781816338 urn:issn:0260-3055 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5167/uzh-13628310.3189/172756403781816338 |
_version_ |
1809943024814260224 |