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The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position

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

Journal of Glaciology, Volume: 68, Issue: 269, Pages: 473 - 485

Swansea University Author: Jim Jordan Orcid Logo

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DOI (Published version): 10.1017/jog.2021.106

Abstract

The Wilkes Subglacial Basin in East Antarctica contains ice equivalent to 3–4 m of global mean sea level rise and is primarily drained by Cook Glacier. Of concern is that recent observations (since the 1970s) show an acceleration in ice speed over the grounding line of both the Eastern and Western p...

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Published in: Journal of Glaciology
ISSN: 0022-1430 1727-5652
Published: Cambridge University Press (CUP) 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa64527
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spelling v2 64527 2023-09-13 The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position 6f28f48bfe39cb898ba51e3114889cbe 0000-0001-8117-1976 Jim Jordan Jim Jordan true false 2023-09-13 SGE The Wilkes Subglacial Basin in East Antarctica contains ice equivalent to 3–4 m of global mean sea level rise and is primarily drained by Cook Glacier. Of concern is that recent observations (since the 1970s) show an acceleration in ice speed over the grounding line of both the Eastern and Western portions of Cook Glacier. Here, we use a numerical ice-flow model (Úa) to simulate the instantaneous effects of observed changes at the terminus of Cook Glacier in order to understand the link between these changes and recently observed ice acceleration. Simulations suggest that the acceleration of Cook West was caused by a retreat in calving-front position in the 1970s, potentially enhanced by grounding-line retreat, while acceleration of Cook East was likely caused by ice-shelf thinning and grounding-line retreat in the mid-1990s. Moreover, we show that the instantaneous ice discharge at Cook East would increase by up to 85% if the whole ice shelf is removed and it ungrounds from a pinning point; and that the discharge at Cook West could increase by ~300% if its grounding line retreated by 10 km. Journal Article Journal of Glaciology 68 269 473 485 Cambridge University Press (CUP) 0022-1430 1727-5652 Antarctic glaciology, glacier modelling, ice shelves 30 6 2022 2022-06-30 10.1017/jog.2021.106 http://dx.doi.org/10.1017/jog.2021.106 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University This study was funded by the Natural Environment Research Council, grant No. NE/R000719/1. 2023-10-04T12:14:18.0073621 2023-09-13T13:19:57.7307450 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Jim Jordan 0000-0001-8117-1976 1 G. Hilmar Gudmundsson 0000-0003-4236-5369 2 Adrian Jenkins 3 Chris R. Stokes 4 Bertie W. J. Miles 0000-0002-3388-4688 5 Stewart S. R. Jamieson 6 64527__28699__e059dd5cc2e04698bbe8f249b1f5231c.pdf 64527.VOR.pdf 2023-10-04T12:13:22.2805085 Output 5492796 application/pdf Version of Record true © The Author(s), 2021. Published by Cambridge University Press. Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0). true eng https://creativecommons.org/licenses/by/4.0/
title The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
spellingShingle The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
Jim Jordan
title_short The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
title_full The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
title_fullStr The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
title_full_unstemmed The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
title_sort The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
author_id_str_mv 6f28f48bfe39cb898ba51e3114889cbe
author_id_fullname_str_mv 6f28f48bfe39cb898ba51e3114889cbe_***_Jim Jordan
author Jim Jordan
author2 Jim Jordan
G. Hilmar Gudmundsson
Adrian Jenkins
Chris R. Stokes
Bertie W. J. Miles
Stewart S. R. Jamieson
format Journal article
container_title Journal of Glaciology
container_volume 68
container_issue 269
container_start_page 473
publishDate 2022
institution Swansea University
issn 0022-1430
1727-5652
doi_str_mv 10.1017/jog.2021.106
publisher Cambridge University Press (CUP)
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/10.1017/jog.2021.106
document_store_str 1
active_str 0
description The Wilkes Subglacial Basin in East Antarctica contains ice equivalent to 3–4 m of global mean sea level rise and is primarily drained by Cook Glacier. Of concern is that recent observations (since the 1970s) show an acceleration in ice speed over the grounding line of both the Eastern and Western portions of Cook Glacier. Here, we use a numerical ice-flow model (Úa) to simulate the instantaneous effects of observed changes at the terminus of Cook Glacier in order to understand the link between these changes and recently observed ice acceleration. Simulations suggest that the acceleration of Cook West was caused by a retreat in calving-front position in the 1970s, potentially enhanced by grounding-line retreat, while acceleration of Cook East was likely caused by ice-shelf thinning and grounding-line retreat in the mid-1990s. Moreover, we show that the instantaneous ice discharge at Cook East would increase by up to 85% if the whole ice shelf is removed and it ungrounds from a pinning point; and that the discharge at Cook West could increase by ~300% if its grounding line retreated by 10 km.
published_date 2022-06-30T12:14:19Z
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score 11.016235

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