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Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration

Bertie W. J. Miles Orcid Logo, Jim Jordan Orcid Logo, Chris R. Stokes Orcid Logo, Stewart S. R. Jamieson, G. Hilmar Gudmundsson Orcid Logo, Adrian Jenkins

The Cryosphere, Volume: 15, Issue: 2, Pages: 663 - 676

Swansea University Author: Jim Jordan Orcid Logo

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DOI (Published version): 10.5194/tc-15-663-2021

Abstract

After Totten, Denman Glacier is the largest contributor to sea level rise in East Antarctica. Denman's catchment contains an ice volume equivalent to 1.5 m of global sea level and sits in the Aurora Subglacial Basin (ASB). Geological evidence of this basin's sensitivity to past warm period...

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Published in: The Cryosphere
ISSN: 1994-0424
Published: Copernicus GmbH 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa64528
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spelling v2 64528 2023-09-13 Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration 6f28f48bfe39cb898ba51e3114889cbe 0000-0001-8117-1976 Jim Jordan Jim Jordan true false 2023-09-13 SGE After Totten, Denman Glacier is the largest contributor to sea level rise in East Antarctica. Denman's catchment contains an ice volume equivalent to 1.5 m of global sea level and sits in the Aurora Subglacial Basin (ASB). Geological evidence of this basin's sensitivity to past warm periods, combined with recent observations showing that Denman's ice speed is accelerating and its grounding line is retreating along a retrograde slope, has raised the prospect that its contributions to sea level rise could accelerate. In this study, we produce the first long-term (∼50 years) record of past glacier behaviour (ice flow speed, ice tongue structure and calving) and combine these observations with numerical modelling to explore the likely drivers of its recent change. We find a spatially widespread acceleration of the Denman system since the 1970s across both its grounded (17±4 % acceleration; 1972–2017) and floating portions (36±5 % acceleration; 1972–2017). Our numerical modelling experiments show that a combination of grounding line retreat, ice tongue thinning and the unpinning of Denman's ice tongue from a pinning point following its last major calving event are required to simulate an acceleration comparable with observations. Given its bed topography and the geological evidence that Denman Glacier has retreated substantially in the past, its recent grounding line retreat and ice flow acceleration suggest that it could be poised to make a significant contribution to sea level in the near future. Journal Article The Cryosphere 15 2 663 676 Copernicus GmbH 1994-0424 Denman Glacier, Antarctica, sea level rise, retreat, ice flow speed, ice tongue structure, calving 11 2 2021 2021-02-11 10.5194/tc-15-663-2021 http://dx.doi.org/10.5194/tc-15-663-2021 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University NERC NE/R000824/1 2023-10-04T12:10:15.8340593 2023-09-13T13:20:15.4270799 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Bertie W. J. Miles 0000-0002-3388-4688 1 Jim Jordan 0000-0001-8117-1976 2 Chris R. Stokes 0000-0003-3355-1573 3 Stewart S. R. Jamieson 4 G. Hilmar Gudmundsson 0000-0003-4236-5369 5 Adrian Jenkins 6 64528__28579__ed58adca6cbe488cbcceec11d29bf560.pdf 64528.pdf 2023-09-19T12:23:34.5976388 Output 11436063 application/pdf Version of Record true © Author(s) 2021. Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0). false eng http://creativecommons.org/licenses/by/4.0/
title Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
spellingShingle Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
Jim Jordan
title_short Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
title_full Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
title_fullStr Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
title_full_unstemmed Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
title_sort Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration
author_id_str_mv 6f28f48bfe39cb898ba51e3114889cbe
author_id_fullname_str_mv 6f28f48bfe39cb898ba51e3114889cbe_***_Jim Jordan
author Jim Jordan
author2 Bertie W. J. Miles
Jim Jordan
Chris R. Stokes
Stewart S. R. Jamieson
G. Hilmar Gudmundsson
Adrian Jenkins
format Journal article
container_title The Cryosphere
container_volume 15
container_issue 2
container_start_page 663
publishDate 2021
institution Swansea University
issn 1994-0424
doi_str_mv 10.5194/tc-15-663-2021
publisher Copernicus GmbH
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
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-15-663-2021
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description After Totten, Denman Glacier is the largest contributor to sea level rise in East Antarctica. Denman's catchment contains an ice volume equivalent to 1.5 m of global sea level and sits in the Aurora Subglacial Basin (ASB). Geological evidence of this basin's sensitivity to past warm periods, combined with recent observations showing that Denman's ice speed is accelerating and its grounding line is retreating along a retrograde slope, has raised the prospect that its contributions to sea level rise could accelerate. In this study, we produce the first long-term (∼50 years) record of past glacier behaviour (ice flow speed, ice tongue structure and calving) and combine these observations with numerical modelling to explore the likely drivers of its recent change. We find a spatially widespread acceleration of the Denman system since the 1970s across both its grounded (17±4 % acceleration; 1972–2017) and floating portions (36±5 % acceleration; 1972–2017). Our numerical modelling experiments show that a combination of grounding line retreat, ice tongue thinning and the unpinning of Denman's ice tongue from a pinning point following its last major calving event are required to simulate an acceleration comparable with observations. Given its bed topography and the geological evidence that Denman Glacier has retreated substantially in the past, its recent grounding line retreat and ice flow acceleration suggest that it could be poised to make a significant contribution to sea level in the near future.
published_date 2021-02-11T12:10:17Z
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