Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams
Present-day mass loss from the West Antarctic ice sheet is centred on the Amundsen Sea Embayment (ASE), primarily through ice streams, including Pine Island, Thwaites and Smith glaciers. To understand the differences in response of these ice streams, we ran a perturbed parameter ensemble, using a ve...
Published in: | Journal of Glaciology |
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Language: | English |
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Online Access: | https://hdl.handle.net/1983/33b77b7f-bf17-423c-994e-0b23d4592e9b https://research-information.bris.ac.uk/en/publications/33b77b7f-bf17-423c-994e-0b23d4592e9b https://doi.org/10.1017/jog.2016.40 https://research-information.bris.ac.uk/ws/files/76452244/S002214301600040Xa.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/33b77b7f-bf17-423c-994e-0b23d4592e9b 2024-05-12T07:52:48+00:00 Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams Nias, Isabel J Cornford, Stephen L Payne, Tony 2016-06 application/pdf https://hdl.handle.net/1983/33b77b7f-bf17-423c-994e-0b23d4592e9b https://research-information.bris.ac.uk/en/publications/33b77b7f-bf17-423c-994e-0b23d4592e9b https://doi.org/10.1017/jog.2016.40 https://research-information.bris.ac.uk/ws/files/76452244/S002214301600040Xa.pdf eng eng https://research-information.bris.ac.uk/en/publications/33b77b7f-bf17-423c-994e-0b23d4592e9b info:eu-repo/semantics/openAccess Nias , I J , Cornford , S L & Payne , T 2016 , ' Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams ' , Journal of Glaciology , vol. 62 , no. 233 , pp. 552-562 . https://doi.org/10.1017/jog.2016.40 Antarctic glaciology grounding line ice flow model ice streams ice-sheet modelling article 2016 ftubristolcris https://doi.org/10.1017/jog.2016.40 2024-04-17T14:18:44Z Present-day mass loss from the West Antarctic ice sheet is centred on the Amundsen Sea Embayment (ASE), primarily through ice streams, including Pine Island, Thwaites and Smith glaciers. To understand the differences in response of these ice streams, we ran a perturbed parameter ensemble, using a vertically-integrated ice flow model with adaptive mesh refinement. We generated 71 sets of three physical parameters (basal traction coefficient, ice viscosity stiffening factor and sub-shelf melt rate), which we used to simulate the ASE for 50 years. We also explored the effects of different bed geometries and basal sliding laws. The mean rate of sea-level rise across the ensemble of simulations is comparable with current observed rates for the ASE. We found evidence that grounding line dynamics are sensitive to features in the bed geometry: simulations using BedMap2 geometry resulted in a higher rate of sea-level rise than simulations using a rougher geometry, created using mass conservation. Modelled grounding-line retreat of all the three ice streams was sensitive to viscosity and basal traction, while the melt rate was more important in Pine Island and Smith glaciers, which flow through more confined ice shelves than Thwaites, which has a relatively unconfined shelf. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelves Journal of Glaciology University of Bristol: Bristol Research Antarctic Amundsen Sea West Antarctic Ice Sheet Journal of Glaciology 62 233 552 562 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Antarctic glaciology grounding line ice flow model ice streams ice-sheet modelling |
spellingShingle |
Antarctic glaciology grounding line ice flow model ice streams ice-sheet modelling Nias, Isabel J Cornford, Stephen L Payne, Tony Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams |
topic_facet |
Antarctic glaciology grounding line ice flow model ice streams ice-sheet modelling |
description |
Present-day mass loss from the West Antarctic ice sheet is centred on the Amundsen Sea Embayment (ASE), primarily through ice streams, including Pine Island, Thwaites and Smith glaciers. To understand the differences in response of these ice streams, we ran a perturbed parameter ensemble, using a vertically-integrated ice flow model with adaptive mesh refinement. We generated 71 sets of three physical parameters (basal traction coefficient, ice viscosity stiffening factor and sub-shelf melt rate), which we used to simulate the ASE for 50 years. We also explored the effects of different bed geometries and basal sliding laws. The mean rate of sea-level rise across the ensemble of simulations is comparable with current observed rates for the ASE. We found evidence that grounding line dynamics are sensitive to features in the bed geometry: simulations using BedMap2 geometry resulted in a higher rate of sea-level rise than simulations using a rougher geometry, created using mass conservation. Modelled grounding-line retreat of all the three ice streams was sensitive to viscosity and basal traction, while the melt rate was more important in Pine Island and Smith glaciers, which flow through more confined ice shelves than Thwaites, which has a relatively unconfined shelf. |
format |
Article in Journal/Newspaper |
author |
Nias, Isabel J Cornford, Stephen L Payne, Tony |
author_facet |
Nias, Isabel J Cornford, Stephen L Payne, Tony |
author_sort |
Nias, Isabel J |
title |
Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams |
title_short |
Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams |
title_full |
Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams |
title_fullStr |
Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams |
title_full_unstemmed |
Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams |
title_sort |
contrasting the modelled sensitivity of the amundsen sea embayment ice streams |
publishDate |
2016 |
url |
https://hdl.handle.net/1983/33b77b7f-bf17-423c-994e-0b23d4592e9b https://research-information.bris.ac.uk/en/publications/33b77b7f-bf17-423c-994e-0b23d4592e9b https://doi.org/10.1017/jog.2016.40 https://research-information.bris.ac.uk/ws/files/76452244/S002214301600040Xa.pdf |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelves Journal of Glaciology |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelves Journal of Glaciology |
op_source |
Nias , I J , Cornford , S L & Payne , T 2016 , ' Contrasting the modelled sensitivity of the Amundsen Sea Embayment ice streams ' , Journal of Glaciology , vol. 62 , no. 233 , pp. 552-562 . https://doi.org/10.1017/jog.2016.40 |
op_relation |
https://research-information.bris.ac.uk/en/publications/33b77b7f-bf17-423c-994e-0b23d4592e9b |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2016.40 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
233 |
container_start_page |
552 |
op_container_end_page |
562 |
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1798838006211149824 |