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...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2018
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/2pn6w9h4 |
id |
ftcdlib:oai:escholarship.org/ark:/13030/qt2pn6w9h4 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org/ark:/13030/qt2pn6w9h4 2023-05-15T14:04:02+02:00 Basal friction of Fleming Glacier, Antarctica -Part 1: Sensitivity of inversion to temperature and bedrock uncertainty Zhao, C Gladstone, RM Warner, RC King, MA Zwinger, T Morlighem, M 2637 - 2652 2018-08-15 https://escholarship.org/uc/item/2pn6w9h4 unknown eScholarship, University of California qt2pn6w9h4 https://escholarship.org/uc/item/2pn6w9h4 public Cryosphere, vol 12, iss 8 Meteorology & Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience article 2018 ftcdlib 2021-04-16T07:11:37Z 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 Wordie Ice Shelf University of California: eScholarship Antarctic Antarctic Peninsula Fleming Glacier ENVELOPE(-66.183,-66.183,-69.467,-69.467) The Antarctic Wordie ENVELOPE(-67.500,-67.500,-69.167,-69.167) Wordie Ice Shelf ENVELOPE(-67.750,-67.750,-69.250,-69.250) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience |
spellingShingle |
Meteorology & Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience Zhao, C Gladstone, RM Warner, RC King, MA Zwinger, T Morlighem, M Basal friction of Fleming Glacier, Antarctica -Part 1: Sensitivity of inversion to temperature and bedrock uncertainty |
topic_facet |
Meteorology & Atmospheric Sciences Oceanography Physical Geography and Environmental Geoscience |
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, C Gladstone, RM Warner, RC King, MA Zwinger, T Morlighem, M |
author_facet |
Zhao, C Gladstone, RM Warner, RC King, MA Zwinger, T Morlighem, M |
author_sort |
Zhao, C |
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 |
long_lat |
ENVELOPE(-66.183,-66.183,-69.467,-69.467) ENVELOPE(-67.500,-67.500,-69.167,-69.167) ENVELOPE(-67.750,-67.750,-69.250,-69.250) |
geographic |
Antarctic Antarctic Peninsula Fleming Glacier The Antarctic Wordie Wordie Ice Shelf |
geographic_facet |
Antarctic Antarctic Peninsula Fleming Glacier The Antarctic Wordie Wordie Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf Wordie Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf Wordie Ice Shelf |
op_source |
Cryosphere, vol 12, iss 8 |
op_relation |
qt2pn6w9h4 https://escholarship.org/uc/item/2pn6w9h4 |
op_rights |
public |
_version_ |
1766274971488747520 |