Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty
Many glaciers in the Antarctic Peninsula are now rapidly losing mass. Understanding of the dynamics of these fast-flowing glaciers, and their potential future behaviour, can be improved through ice sheet modelling studies. Inverse methods are commonly used in ice sheet models to infer the spatial di...
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ftcdlib:oai:escholarship.org:ark:/13030/qt2pn6w9h4 2023-11-05T03:36:32+01:00 Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty Zhao, Chen Gladstone, Rupert M Warner, Roland C King, Matt A Zwinger, Thomas Morlighem, Mathieu 2637 - 2652 2018-01-01 https://escholarship.org/uc/item/2pn6w9h4 unknown eScholarship, University of California qt2pn6w9h4 https://escholarship.org/uc/item/2pn6w9h4 public The Cryosphere, vol 12, iss 8 Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Oceanography Meteorology & Atmospheric Sciences article 2018 ftcdlib 2023-10-09T18:07:55Z Many glaciers in the Antarctic Peninsula are now rapidly losing mass. Understanding of the dynamics of these fast-flowing glaciers, and their potential future behaviour, can be improved through ice sheet modelling studies. Inverse methods are commonly used in ice sheet models to infer the spatial distribution of a basal friction coefficient, which has a large effect on the basal velocity and ice deformation. Here we use the full-Stokes Elmer/Ice model to simulate the Wordie Ice Shelf-Fleming Glacier system in the southern Antarctic Peninsula. With an inverse method, we infer the pattern of the basal friction coefficient from surface velocities observed in 2008. We propose a multi-cycle spin-up scheme to reduce the influence of the assumed initial englacial temperature field on the final inversion. This is particularly important for glaciers like the Fleming Glacier, which have areas of strongly temperature-dependent deformational flow in the fast-flowing regions. Sensitivity tests using various bed elevation datasets, ice front positions and boundary conditions demonstrate the importance of high-accuracy ice thickness/bed geometry data and precise location of the ice front boundary. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf The Cryosphere Wordie Ice Shelf University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Oceanography Meteorology & Atmospheric Sciences |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Oceanography Meteorology & Atmospheric Sciences Zhao, Chen Gladstone, Rupert M Warner, Roland C King, Matt A Zwinger, Thomas Morlighem, Mathieu Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Oceanography Meteorology & Atmospheric Sciences |
description |
Many glaciers in the Antarctic Peninsula are now rapidly losing mass. Understanding of the dynamics of these fast-flowing glaciers, and their potential future behaviour, can be improved through ice sheet modelling studies. Inverse methods are commonly used in ice sheet models to infer the spatial distribution of a basal friction coefficient, which has a large effect on the basal velocity and ice deformation. Here we use the full-Stokes Elmer/Ice model to simulate the Wordie Ice Shelf-Fleming Glacier system in the southern Antarctic Peninsula. With an inverse method, we infer the pattern of the basal friction coefficient from surface velocities observed in 2008. We propose a multi-cycle spin-up scheme to reduce the influence of the assumed initial englacial temperature field on the final inversion. This is particularly important for glaciers like the Fleming Glacier, which have areas of strongly temperature-dependent deformational flow in the fast-flowing regions. Sensitivity tests using various bed elevation datasets, ice front positions and boundary conditions demonstrate the importance of high-accuracy ice thickness/bed geometry data and precise location of the ice front boundary. |
format |
Article in Journal/Newspaper |
author |
Zhao, Chen Gladstone, Rupert M Warner, Roland C King, Matt A Zwinger, Thomas Morlighem, Mathieu |
author_facet |
Zhao, Chen Gladstone, Rupert M Warner, Roland C King, Matt A Zwinger, Thomas Morlighem, Mathieu |
author_sort |
Zhao, Chen |
title |
Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
title_short |
Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
title_full |
Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
title_fullStr |
Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
title_full_unstemmed |
Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
title_sort |
basal friction of fleming glacier, antarctica – part 1: sensitivity of inversion to temperature and bedrock uncertainty |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/2pn6w9h4 |
op_coverage |
2637 - 2652 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf The Cryosphere Wordie Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf The Cryosphere Wordie Ice Shelf |
op_source |
The Cryosphere, vol 12, iss 8 |
op_relation |
qt2pn6w9h4 https://escholarship.org/uc/item/2pn6w9h4 |
op_rights |
public |
_version_ |
1781691504833593344 |