Initialization of an ice-sheet model for present-day Greenland
We construct initial conditions for an ice flow model of the Greenland ice sheet (GrIS). GrIS has been losing mass at an increasing rate over the past two decades, and a significant proportion of this loss is due to dynamic thinning of narrow outlet glaciers. We solve an inverse problem to estimate...
Published in: | Annals of Glaciology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2015
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Online Access: | https://hdl.handle.net/1983/c642f028-dffa-4c01-8a25-a4abd21113a9 https://research-information.bris.ac.uk/en/publications/c642f028-dffa-4c01-8a25-a4abd21113a9 https://doi.org/10.3189/2015AoG70A121 https://research-information.bris.ac.uk/ws/files/75822065/s15.pdf http://www.scopus.com/inward/record.url?scp=84932184170&partnerID=8YFLogxK |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/c642f028-dffa-4c01-8a25-a4abd21113a9 2024-02-11T09:55:37+01:00 Initialization of an ice-sheet model for present-day Greenland Lee, Victoria Cornford, Stephen L. Payne, Antony J. 2015-10 application/pdf https://hdl.handle.net/1983/c642f028-dffa-4c01-8a25-a4abd21113a9 https://research-information.bris.ac.uk/en/publications/c642f028-dffa-4c01-8a25-a4abd21113a9 https://doi.org/10.3189/2015AoG70A121 https://research-information.bris.ac.uk/ws/files/75822065/s15.pdf http://www.scopus.com/inward/record.url?scp=84932184170&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Lee , V , Cornford , S L & Payne , A J 2015 , ' Initialization of an ice-sheet model for present-day Greenland ' , Annals of Glaciology , vol. 56 , no. 70 , pp. 129-140 . https://doi.org/10.3189/2015AoG70A121 Ice-sheet modelling article 2015 ftubristolcris https://doi.org/10.3189/2015AoG70A121 2024-01-18T23:30:07Z We construct initial conditions for an ice flow model of the Greenland ice sheet (GrIS). GrIS has been losing mass at an increasing rate over the past two decades, and a significant proportion of this loss is due to dynamic thinning of narrow outlet glaciers. We solve an inverse problem to estimate poorly known basal and englacial parameters given observed geometry and surface velocities. A weighted cost function, resolved to 4 km in the interior of the ice sheet and 1 km in regions of fast-flowing ice at the margin, is minimized to find two-dimensional fields for a stiffness factor, which is a coefficient of the effective viscosity, and basal traction coefficient. Using these fields, we run the model under present-day climate to damp large-amplitude, short-wavelength fluctuations in the flux divergence. The time-dependent model uses an adaptive mesh with resolution ranging from 8 km of the base grid to 500 m in areas of fast-flowing ice to capture the behaviour of the main outlet glaciers. The ice discharge calculated from the initial conditions for GrIS and individual glaciers compares well with values calculated from observations. Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet University of Bristol: Bristol Research Greenland Annals of Glaciology 56 70 129 140 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Ice-sheet modelling |
spellingShingle |
Ice-sheet modelling Lee, Victoria Cornford, Stephen L. Payne, Antony J. Initialization of an ice-sheet model for present-day Greenland |
topic_facet |
Ice-sheet modelling |
description |
We construct initial conditions for an ice flow model of the Greenland ice sheet (GrIS). GrIS has been losing mass at an increasing rate over the past two decades, and a significant proportion of this loss is due to dynamic thinning of narrow outlet glaciers. We solve an inverse problem to estimate poorly known basal and englacial parameters given observed geometry and surface velocities. A weighted cost function, resolved to 4 km in the interior of the ice sheet and 1 km in regions of fast-flowing ice at the margin, is minimized to find two-dimensional fields for a stiffness factor, which is a coefficient of the effective viscosity, and basal traction coefficient. Using these fields, we run the model under present-day climate to damp large-amplitude, short-wavelength fluctuations in the flux divergence. The time-dependent model uses an adaptive mesh with resolution ranging from 8 km of the base grid to 500 m in areas of fast-flowing ice to capture the behaviour of the main outlet glaciers. The ice discharge calculated from the initial conditions for GrIS and individual glaciers compares well with values calculated from observations. |
format |
Article in Journal/Newspaper |
author |
Lee, Victoria Cornford, Stephen L. Payne, Antony J. |
author_facet |
Lee, Victoria Cornford, Stephen L. Payne, Antony J. |
author_sort |
Lee, Victoria |
title |
Initialization of an ice-sheet model for present-day Greenland |
title_short |
Initialization of an ice-sheet model for present-day Greenland |
title_full |
Initialization of an ice-sheet model for present-day Greenland |
title_fullStr |
Initialization of an ice-sheet model for present-day Greenland |
title_full_unstemmed |
Initialization of an ice-sheet model for present-day Greenland |
title_sort |
initialization of an ice-sheet model for present-day greenland |
publishDate |
2015 |
url |
https://hdl.handle.net/1983/c642f028-dffa-4c01-8a25-a4abd21113a9 https://research-information.bris.ac.uk/en/publications/c642f028-dffa-4c01-8a25-a4abd21113a9 https://doi.org/10.3189/2015AoG70A121 https://research-information.bris.ac.uk/ws/files/75822065/s15.pdf http://www.scopus.com/inward/record.url?scp=84932184170&partnerID=8YFLogxK |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
Lee , V , Cornford , S L & Payne , A J 2015 , ' Initialization of an ice-sheet model for present-day Greenland ' , Annals of Glaciology , vol. 56 , no. 70 , pp. 129-140 . https://doi.org/10.3189/2015AoG70A121 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/2015AoG70A121 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
70 |
container_start_page |
129 |
op_container_end_page |
140 |
_version_ |
1790597962644062208 |