Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law
Reliable projections of ice sheets' future contributions to sea-level rise require models that are able to accurately simulate grounding-line dynamics, starting from initial states consistent with observations. Here, we simulate the centennial evolution of the Amundsen Sea Embayment in response...
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2019
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ftdoajarticles:oai:doaj.org/article:adc736a91f4a4a22bbe7fb208b00dd37 2023-05-15T13:22:44+02:00 Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law J. Brondex F. Gillet-Chaulet O. Gagliardini 2019-01-01T00:00:00Z https://doi.org/10.5194/tc-13-177-2019 https://doaj.org/article/adc736a91f4a4a22bbe7fb208b00dd37 EN eng Copernicus Publications https://www.the-cryosphere.net/13/177/2019/tc-13-177-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-177-2019 1994-0416 1994-0424 https://doaj.org/article/adc736a91f4a4a22bbe7fb208b00dd37 The Cryosphere, Vol 13, Pp 177-195 (2019) Environmental sciences GE1-350 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/tc-13-177-2019 2022-12-31T00:08:21Z Reliable projections of ice sheets' future contributions to sea-level rise require models that are able to accurately simulate grounding-line dynamics, starting from initial states consistent with observations. Here, we simulate the centennial evolution of the Amundsen Sea Embayment in response to a prescribed perturbation in order to assess the sensitivity of mass loss projections to the chosen friction law, depending on the initialisation strategy. To this end, three different model states are constructed by inferring both the initial basal shear stress and viscosity fields with various relative weights. Then, starting from each of these model states, prognostic simulations are carried out using a Weertman, a Schoof and a Budd friction law, with different parameter values. Although the sensitivity of projections to the chosen friction law tends to decrease when more weight is put on viscosity during initialisation, it remains significant for the most physically acceptable of the constructed model states. Independently of the considered model state, the Weertman law systematically predicts the lowest mass losses. In addition, because of its particular dependence on effective pressure, the Budd friction law induces significantly different grounding-line retreat patterns than the other laws and predicts significantly higher mass losses. Article in Journal/Newspaper amundsen basin Amundsen Sea The Cryosphere Directory of Open Access Journals: DOAJ Articles Amundsen Sea Weertman ENVELOPE(-67.753,-67.753,-66.972,-66.972) The Cryosphere 13 1 177 195 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 J. Brondex F. Gillet-Chaulet O. Gagliardini Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Reliable projections of ice sheets' future contributions to sea-level rise require models that are able to accurately simulate grounding-line dynamics, starting from initial states consistent with observations. Here, we simulate the centennial evolution of the Amundsen Sea Embayment in response to a prescribed perturbation in order to assess the sensitivity of mass loss projections to the chosen friction law, depending on the initialisation strategy. To this end, three different model states are constructed by inferring both the initial basal shear stress and viscosity fields with various relative weights. Then, starting from each of these model states, prognostic simulations are carried out using a Weertman, a Schoof and a Budd friction law, with different parameter values. Although the sensitivity of projections to the chosen friction law tends to decrease when more weight is put on viscosity during initialisation, it remains significant for the most physically acceptable of the constructed model states. Independently of the considered model state, the Weertman law systematically predicts the lowest mass losses. In addition, because of its particular dependence on effective pressure, the Budd friction law induces significantly different grounding-line retreat patterns than the other laws and predicts significantly higher mass losses. |
format |
Article in Journal/Newspaper |
author |
J. Brondex F. Gillet-Chaulet O. Gagliardini |
author_facet |
J. Brondex F. Gillet-Chaulet O. Gagliardini |
author_sort |
J. Brondex |
title |
Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law |
title_short |
Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law |
title_full |
Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law |
title_fullStr |
Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law |
title_full_unstemmed |
Sensitivity of centennial mass loss projections of the Amundsen basin to the friction law |
title_sort |
sensitivity of centennial mass loss projections of the amundsen basin to the friction law |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-177-2019 https://doaj.org/article/adc736a91f4a4a22bbe7fb208b00dd37 |
long_lat |
ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
geographic |
Amundsen Sea Weertman |
geographic_facet |
Amundsen Sea Weertman |
genre |
amundsen basin Amundsen Sea The Cryosphere |
genre_facet |
amundsen basin Amundsen Sea The Cryosphere |
op_source |
The Cryosphere, Vol 13, Pp 177-195 (2019) |
op_relation |
https://www.the-cryosphere.net/13/177/2019/tc-13-177-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-177-2019 1994-0416 1994-0424 https://doaj.org/article/adc736a91f4a4a22bbe7fb208b00dd37 |
op_doi |
https://doi.org/10.5194/tc-13-177-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
1 |
container_start_page |
177 |
op_container_end_page |
195 |
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1766366579512049664 |