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Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations

Tom A. Jordan Orcid Logo, Sarah Thompson, Bernd Kulessa Orcid Logo, Fausto Ferraccioli Orcid Logo

Science Advances, Volume: 9, Issue: 22

Swansea University Author: Bernd Kulessa Orcid Logo

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DOI (Published version): 10.1126/sciadv.adf2639

Abstract

The geology beneath Thwaites Glacier, the Antarctic glacial catchment most vulnerable to climate change, is unknown. Thwaites Glacier lies within the West Antarctic Rift System, but details of the subglacial geology relevant to glacial flow, including sediment availability, underlying lithology, and...

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Published in: Science Advances
ISSN: 2375-2548
Published: American Association for the Advancement of Science (AAAS) 2023
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spelling v2 63536 2023-05-25 Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations 52acda616e9f6073cbebf497def874c9 0000-0002-4830-4949 Bernd Kulessa Bernd Kulessa true false 2023-05-25 SGE The geology beneath Thwaites Glacier, the Antarctic glacial catchment most vulnerable to climate change, is unknown. Thwaites Glacier lies within the West Antarctic Rift System, but details of the subglacial geology relevant to glacial flow, including sediment availability, underlying lithology, and heat flux, are lacking. We present the first sketch map of the subglacial geology of Thwaites Glacier, interpreted from maps of airborne gravity, magnetic and radar data, supported by 2D models and 3D inversion of subsurface properties, and the regional geological context. A zone of Cretaceous maficmagmatism extending ~200 km inland from the coast is interpreted, while sedimentary basins are restricted to a region 150 to 200 km inboard of the coast, underlying just 20% of the catchment. Several granitic subglacial highlands are identified, forming long-lived topographic highs. Our geological interpretation places constraints on the basal properties of Thwaites Glacier, laying the foundation for both improved predictions of ice sheet change and studies of West Antarctic tectonics. Journal Article Science Advances 9 22 American Association for the Advancement of Science (AAAS) 2375-2548 2 6 2023 2023-06-02 10.1126/sciadv.adf2639 http://dx.doi.org/10.1126/sciadv.adf2639 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University This work was supported by the British Antarctic Survey (BAS) National Capability contribution to the International Thwaites Glacier Collaboration (ITGC) (to T.A.J.), NERC grant NE/S006621/1 [Geophysical Habitats of Subglacial Thwaites (Ghost)] (to B.K.), Antarctic Science Collaboration Initiative program (Australian government) (to S.T.), and the European Space Agency (ESA) 4D Antarctica project (to F.F.). 2023-06-13T14:55:56.7667839 2023-05-25T10:07:36.6971392 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Tom A. Jordan 0000-0003-2780-1986 1 Sarah Thompson 2 Bernd Kulessa 0000-0002-4830-4949 3 Fausto Ferraccioli 0000-0002-9347-4736 4 63536__27815__7cbb4f08197240c786df178a8e2f8ec2.pdf 63536.pdf 2023-06-13T11:04:06.7333951 Output 3359248 application/pdf Version of Record true Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. true eng https://creativecommons.org/licenses/by/4.0/
title Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
spellingShingle Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
Bernd Kulessa
title_short Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
title_full Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
title_fullStr Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
title_full_unstemmed Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
title_sort Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations
author_id_str_mv 52acda616e9f6073cbebf497def874c9
author_id_fullname_str_mv 52acda616e9f6073cbebf497def874c9_***_Bernd Kulessa
author Bernd Kulessa
author2 Tom A. Jordan
Sarah Thompson
Bernd Kulessa
Fausto Ferraccioli
format Journal article
container_title Science Advances
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container_issue 22
publishDate 2023
institution Swansea University
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doi_str_mv 10.1126/sciadv.adf2639
publisher American Association for the Advancement of Science (AAAS)
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
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department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
url http://dx.doi.org/10.1126/sciadv.adf2639
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description The geology beneath Thwaites Glacier, the Antarctic glacial catchment most vulnerable to climate change, is unknown. Thwaites Glacier lies within the West Antarctic Rift System, but details of the subglacial geology relevant to glacial flow, including sediment availability, underlying lithology, and heat flux, are lacking. We present the first sketch map of the subglacial geology of Thwaites Glacier, interpreted from maps of airborne gravity, magnetic and radar data, supported by 2D models and 3D inversion of subsurface properties, and the regional geological context. A zone of Cretaceous maficmagmatism extending ~200 km inland from the coast is interpreted, while sedimentary basins are restricted to a region 150 to 200 km inboard of the coast, underlying just 20% of the catchment. Several granitic subglacial highlands are identified, forming long-lived topographic highs. Our geological interpretation places constraints on the basal properties of Thwaites Glacier, laying the foundation for both improved predictions of ice sheet change and studies of West Antarctic tectonics.
published_date 2023-06-02T14:55:55Z
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