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Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica

Felicity S. McCormack Orcid Logo, Jason L. Roberts Orcid Logo, Bernd Kulessa Orcid Logo, Alan Aitken Orcid Logo, Christine F. Dow Orcid Logo, Lawrence Bird Orcid Logo, Benjamin K. Galton-Fenzi Orcid Logo, Katharina Hochmuth Orcid Logo, Richard S. Jones Orcid Logo, Andrew N. Mackintosh, Koi McArthur

The Cryosphere, Volume: 17, Issue: 11, Pages: 4549 - 4569

Swansea University Author: Bernd Kulessa Orcid Logo

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DOI (Published version): 10.5194/tc-17-4549-2023

Abstract

The largest regional drivers of current surface elevation increases in the Antarctic Ice Sheet are associated with ice flow reconfiguration in previously active ice streams, highlighting the important role of ice dynamics in responding to climate change. Here, we investigate controls on the evolutio...

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Published in: The Cryosphere
ISSN: 1994-0424
Published: Copernicus GmbH 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa64775
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Here, we investigate controls on the evolution of the flow configuration of the Vanderford and Totten Glaciers – key outlet glaciers of the Aurora Subglacial Basin, the most rapidly thinning region of the East Antarctic Ice Sheet. We review factors that influence the ice flow in this region, and use an ice sheet model to investigate the sensitivity of the catchment divide location to thinning at Vanderford Glacier associated with ongoing retreat, and thickening at Totten Glacier associated with an intensification of the east-west snowfall gradient. The present-day catchment divide between the Totten and Vanderford Glaciers is not constrained by the geology or topography, but is determined by the large-scale ice sheet geometry and its long-term evolution in response to climate forcing. Furthermore, the catchment divide is subject to migration under relatively small changes in surface elevation, leading to ice flow and basal water piracy from Totten to Vanderford Glacier. Our findings show that ice flow reconfigurations do not only occur in regions of West Antarctica like the Siple Coast, but also in the east, motivating further investigations of past, and potential for future, ice flow reconfigurations around the whole Antarctic coastline. Such modelling of ice flow and basal water piracy may require coupled ice sheet thermomechanical and subglacial hydrology models, constrained by field observations of subglacial conditions. 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spelling v2 64775 2023-10-19 Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica 52acda616e9f6073cbebf497def874c9 0000-0002-4830-4949 Bernd Kulessa Bernd Kulessa true false 2023-10-19 SGE The largest regional drivers of current surface elevation increases in the Antarctic Ice Sheet are associated with ice flow reconfiguration in previously active ice streams, highlighting the important role of ice dynamics in responding to climate change. Here, we investigate controls on the evolution of the flow configuration of the Vanderford and Totten Glaciers – key outlet glaciers of the Aurora Subglacial Basin, the most rapidly thinning region of the East Antarctic Ice Sheet. We review factors that influence the ice flow in this region, and use an ice sheet model to investigate the sensitivity of the catchment divide location to thinning at Vanderford Glacier associated with ongoing retreat, and thickening at Totten Glacier associated with an intensification of the east-west snowfall gradient. The present-day catchment divide between the Totten and Vanderford Glaciers is not constrained by the geology or topography, but is determined by the large-scale ice sheet geometry and its long-term evolution in response to climate forcing. Furthermore, the catchment divide is subject to migration under relatively small changes in surface elevation, leading to ice flow and basal water piracy from Totten to Vanderford Glacier. Our findings show that ice flow reconfigurations do not only occur in regions of West Antarctica like the Siple Coast, but also in the east, motivating further investigations of past, and potential for future, ice flow reconfigurations around the whole Antarctic coastline. Such modelling of ice flow and basal water piracy may require coupled ice sheet thermomechanical and subglacial hydrology models, constrained by field observations of subglacial conditions. Our results also have implications for ice sheet mass budget studies that integrate over catchments, and the validity of the zero flow assumption when selecting sites for ice core records of past climate. Journal Article The Cryosphere 17 11 4549 4569 Copernicus GmbH 1994-0424 Antarctic, Ice Sheet, Glacier, Ice Flow 1 11 2023 2023-11-01 10.5194/tc-17-4549-2023 http://dx.doi.org/10.5194/tc-17-4549-2023 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University Another institution paid the OA fee This research has been supported by the Australian Research Council (ARC) Special Research Initiative (SRI) Securing Antarctica's Environmental Future (SR200100005), ARC Discovery Early Career Awards (DE210101433, DE210101923), the ARC SRI Australian Centre for Excellence in Antarctic Science (SR200100008), the Natural Sciences and Engineering Research Council of Canada (grant no. NSERC RGPIN; 03761-2017), and the Canada Research Chairs (grant no. CRC 950-231237). 2023-12-14T17:34:27.4438366 2023-10-19T08:09:55.1611628 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Felicity S. McCormack 0000-0002-2324-2120 1 Jason L. Roberts 0000-0002-3477-4069 2 Bernd Kulessa 0000-0002-4830-4949 3 Alan Aitken 0000-0002-6375-2504 4 Christine F. Dow 0000-0003-1346-2258 5 Lawrence Bird 0000-0001-6541-2768 6 Benjamin K. Galton-Fenzi 0000-0003-1404-4103 7 Katharina Hochmuth 0000-0003-2789-2179 8 Richard S. Jones 0000-0003-2988-0999 9 Andrew N. Mackintosh 10 Koi McArthur 11 64775__29171__0047e9dbd9204ae995d29fb4cfc62fee.pdf BKulessaVOR.pdf 2023-12-04T10:01:22.6957097 Output 13411629 application/pdf Version of Record true Author(s) 2023. This work is distributed under the Creative Commons Attribution 4.0 License. false eng https://creativecommons.org/licenses/by/4.0/
title Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
spellingShingle Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
Bernd Kulessa
title_short Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
title_full Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
title_fullStr Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
title_full_unstemmed Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
title_sort Assessing the potential for ice flow piracy between the Totten and Vanderford glaciers, East Antarctica
author_id_str_mv 52acda616e9f6073cbebf497def874c9
author_id_fullname_str_mv 52acda616e9f6073cbebf497def874c9_***_Bernd Kulessa
author Bernd Kulessa
author2 Felicity S. McCormack
Jason L. Roberts
Bernd Kulessa
Alan Aitken
Christine F. Dow
Lawrence Bird
Benjamin K. Galton-Fenzi
Katharina Hochmuth
Richard S. Jones
Andrew N. Mackintosh
Koi McArthur
format Journal article
container_title The Cryosphere
container_volume 17
container_issue 11
container_start_page 4549
publishDate 2023
institution Swansea University
issn 1994-0424
doi_str_mv 10.5194/tc-17-4549-2023
publisher Copernicus GmbH
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
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/10.5194/tc-17-4549-2023
document_store_str 1
active_str 0
description The largest regional drivers of current surface elevation increases in the Antarctic Ice Sheet are associated with ice flow reconfiguration in previously active ice streams, highlighting the important role of ice dynamics in responding to climate change. Here, we investigate controls on the evolution of the flow configuration of the Vanderford and Totten Glaciers – key outlet glaciers of the Aurora Subglacial Basin, the most rapidly thinning region of the East Antarctic Ice Sheet. We review factors that influence the ice flow in this region, and use an ice sheet model to investigate the sensitivity of the catchment divide location to thinning at Vanderford Glacier associated with ongoing retreat, and thickening at Totten Glacier associated with an intensification of the east-west snowfall gradient. The present-day catchment divide between the Totten and Vanderford Glaciers is not constrained by the geology or topography, but is determined by the large-scale ice sheet geometry and its long-term evolution in response to climate forcing. Furthermore, the catchment divide is subject to migration under relatively small changes in surface elevation, leading to ice flow and basal water piracy from Totten to Vanderford Glacier. Our findings show that ice flow reconfigurations do not only occur in regions of West Antarctica like the Siple Coast, but also in the east, motivating further investigations of past, and potential for future, ice flow reconfigurations around the whole Antarctic coastline. Such modelling of ice flow and basal water piracy may require coupled ice sheet thermomechanical and subglacial hydrology models, constrained by field observations of subglacial conditions. Our results also have implications for ice sheet mass budget studies that integrate over catchments, and the validity of the zero flow assumption when selecting sites for ice core records of past climate.
published_date 2023-11-01T17:34:28Z
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score 11.037253

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