The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position
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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Cambridge University Press
2022
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ftdoajarticles:oai:doaj.org/article:81c0b551f1d3426ea3db20e6762d6fc5 2023-05-15T14:13:31+02:00 The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position James R. Jordan G. Hilmar Gudmundsson Adrian Jenkins Chris R. Stokes Bertie W. J. Miles Stewart S. R. Jamieson 2022-06-01T00:00:00Z https://doi.org/10.1017/jog.2021.106 https://doaj.org/article/81c0b551f1d3426ea3db20e6762d6fc5 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021001064/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.106 0022-1430 1727-5652 https://doaj.org/article/81c0b551f1d3426ea3db20e6762d6fc5 Journal of Glaciology, Vol 68, Pp 473-485 (2022) Antarctic glaciology glacier modelling ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.1017/jog.2021.106 2023-03-12T01:30:54Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Cook Glacier East Antarctica Ice Shelf Ice Shelves Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Cook Glacier ENVELOPE(-36.191,-36.191,-54.446,-54.446) Journal of Glaciology 68 269 473 485 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic glaciology glacier modelling ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Antarctic glaciology glacier modelling ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 James R. Jordan G. Hilmar Gudmundsson Adrian Jenkins Chris R. Stokes Bertie W. J. Miles Stewart S. R. Jamieson The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position |
topic_facet |
Antarctic glaciology glacier modelling ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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. |
format |
Article in Journal/Newspaper |
author |
James R. Jordan G. Hilmar Gudmundsson Adrian Jenkins Chris R. Stokes Bertie W. J. Miles Stewart S. R. Jamieson |
author_facet |
James R. Jordan G. Hilmar Gudmundsson Adrian Jenkins Chris R. Stokes Bertie W. J. Miles Stewart S. R. Jamieson |
author_sort |
James R. Jordan |
title |
The sensitivity of Cook Glacier, East Antarctica, to changes in ice-shelf extent and grounding-line position |
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 |
sensitivity of cook glacier, east antarctica, to changes in ice-shelf extent and grounding-line position |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://doi.org/10.1017/jog.2021.106 https://doaj.org/article/81c0b551f1d3426ea3db20e6762d6fc5 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) ENVELOPE(-36.191,-36.191,-54.446,-54.446) |
geographic |
Antarctic East Antarctica Wilkes Subglacial Basin Cook Glacier |
geographic_facet |
Antarctic East Antarctica Wilkes Subglacial Basin Cook Glacier |
genre |
Antarc* Antarctic Antarctica Cook Glacier East Antarctica Ice Shelf Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Cook Glacier East Antarctica Ice Shelf Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 68, Pp 473-485 (2022) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021001064/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.106 0022-1430 1727-5652 https://doaj.org/article/81c0b551f1d3426ea3db20e6762d6fc5 |
op_doi |
https://doi.org/10.1017/jog.2021.106 |
container_title |
Journal of Glaciology |
container_volume |
68 |
container_issue |
269 |
container_start_page |
473 |
op_container_end_page |
485 |
_version_ |
1766285973019164672 |