The Impact of Basal Roughness on Inland Thwaites Glacier Sliding
Swath radar technology enables three-dimensional mapping of modern glacier beds over large areas at resolutions that are higher than those typically used in ice-flow models. These data may enable new understanding of processes at the ice-bed interface. Here, we use two densely surveyed swath-mapped...
Published in: | Geophysical Research Letters |
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American Geophysical Union
2022
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Online Access: | http://nora.nerc.ac.uk/id/eprint/532945/ https://nora.nerc.ac.uk/id/eprint/532945/1/Geophysical%20Research%20Letters%20-%202022%20-%20Hoffman%20-%20The%20Impact%20of%20Basal%20Roughness%20on%20Inland%20Thwaites%20Glacier%20Sliding.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL096564 |
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ftnerc:oai:nora.nerc.ac.uk:532945 2023-05-15T18:33:01+02:00 The Impact of Basal Roughness on Inland Thwaites Glacier Sliding Hoffman, Andrew O. Christianson, Knut Holschuh, Nicholas Case, Elizabeth Kingslake, Jonathan Arthern, Robert 2022-06-18 text http://nora.nerc.ac.uk/id/eprint/532945/ https://nora.nerc.ac.uk/id/eprint/532945/1/Geophysical%20Research%20Letters%20-%202022%20-%20Hoffman%20-%20The%20Impact%20of%20Basal%20Roughness%20on%20Inland%20Thwaites%20Glacier%20Sliding.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL096564 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/532945/1/Geophysical%20Research%20Letters%20-%202022%20-%20Hoffman%20-%20The%20Impact%20of%20Basal%20Roughness%20on%20Inland%20Thwaites%20Glacier%20Sliding.pdf Hoffman, Andrew O.; Christianson, Knut; Holschuh, Nicholas; Case, Elizabeth; Kingslake, Jonathan; Arthern, Robert orcid:0000-0002-3762-8219 . 2022 The Impact of Basal Roughness on Inland Thwaites Glacier Sliding. Geophysical Research Letters, 49 (14), e2021GL096564. 11, pp. https://doi.org/10.1029/2021GL096564 <https://doi.org/10.1029/2021GL096564> cc_by_nc_4 CC-BY-NC Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1029/2021GL096564 2023-02-04T19:53:25Z Swath radar technology enables three-dimensional mapping of modern glacier beds over large areas at resolutions that are higher than those typically used in ice-flow models. These data may enable new understanding of processes at the ice-bed interface. Here, we use two densely surveyed swath-mapped topographies (<50 m2 resolution) of Thwaites Glacier to investigate the sensitivity of inferred basal friction proxies to bed roughness magnitude and orientation. Our work suggests that along-flow roughness influences inferred friction more than transverse-flow roughness, which agrees with analytic form-drag sliding theory. Using our model results, we calculate the slip length (the ratio of internal shear to basal slip). We find excellent agreement between the numerically derived slip lengths and slip lengths predicted by analytic form-drag sliding theory, which suggests that unresolved short wavelength bed roughness may control sliding in the Thwaites interior. Article in Journal/Newspaper Thwaites Glacier Natural Environment Research Council: NERC Open Research Archive Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Geophysical Research Letters 49 14 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Swath radar technology enables three-dimensional mapping of modern glacier beds over large areas at resolutions that are higher than those typically used in ice-flow models. These data may enable new understanding of processes at the ice-bed interface. Here, we use two densely surveyed swath-mapped topographies (<50 m2 resolution) of Thwaites Glacier to investigate the sensitivity of inferred basal friction proxies to bed roughness magnitude and orientation. Our work suggests that along-flow roughness influences inferred friction more than transverse-flow roughness, which agrees with analytic form-drag sliding theory. Using our model results, we calculate the slip length (the ratio of internal shear to basal slip). We find excellent agreement between the numerically derived slip lengths and slip lengths predicted by analytic form-drag sliding theory, which suggests that unresolved short wavelength bed roughness may control sliding in the Thwaites interior. |
format |
Article in Journal/Newspaper |
author |
Hoffman, Andrew O. Christianson, Knut Holschuh, Nicholas Case, Elizabeth Kingslake, Jonathan Arthern, Robert |
spellingShingle |
Hoffman, Andrew O. Christianson, Knut Holschuh, Nicholas Case, Elizabeth Kingslake, Jonathan Arthern, Robert The Impact of Basal Roughness on Inland Thwaites Glacier Sliding |
author_facet |
Hoffman, Andrew O. Christianson, Knut Holschuh, Nicholas Case, Elizabeth Kingslake, Jonathan Arthern, Robert |
author_sort |
Hoffman, Andrew O. |
title |
The Impact of Basal Roughness on Inland Thwaites Glacier Sliding |
title_short |
The Impact of Basal Roughness on Inland Thwaites Glacier Sliding |
title_full |
The Impact of Basal Roughness on Inland Thwaites Glacier Sliding |
title_fullStr |
The Impact of Basal Roughness on Inland Thwaites Glacier Sliding |
title_full_unstemmed |
The Impact of Basal Roughness on Inland Thwaites Glacier Sliding |
title_sort |
impact of basal roughness on inland thwaites glacier sliding |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/532945/ https://nora.nerc.ac.uk/id/eprint/532945/1/Geophysical%20Research%20Letters%20-%202022%20-%20Hoffman%20-%20The%20Impact%20of%20Basal%20Roughness%20on%20Inland%20Thwaites%20Glacier%20Sliding.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL096564 |
long_lat |
ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Thwaites Glacier |
geographic_facet |
Thwaites Glacier |
genre |
Thwaites Glacier |
genre_facet |
Thwaites Glacier |
op_relation |
https://nora.nerc.ac.uk/id/eprint/532945/1/Geophysical%20Research%20Letters%20-%202022%20-%20Hoffman%20-%20The%20Impact%20of%20Basal%20Roughness%20on%20Inland%20Thwaites%20Glacier%20Sliding.pdf Hoffman, Andrew O.; Christianson, Knut; Holschuh, Nicholas; Case, Elizabeth; Kingslake, Jonathan; Arthern, Robert orcid:0000-0002-3762-8219 . 2022 The Impact of Basal Roughness on Inland Thwaites Glacier Sliding. Geophysical Research Letters, 49 (14), e2021GL096564. 11, pp. https://doi.org/10.1029/2021GL096564 <https://doi.org/10.1029/2021GL096564> |
op_rights |
cc_by_nc_4 |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1029/2021GL096564 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
14 |
_version_ |
1766217251528114176 |