An assessment of basal melt parameterisations for Antarctic ice shelves
International audience Ocean-induced ice-shelf melt is one of the largest uncertainty factors in the Antarctic contribution to future sealevel rise. Several parameterisations exist, linking oceanic properties in front of the ice shelf to melt at the base of the ice shelf, to force ice-sheet models....
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Online Access: | https://hal.science/hal-04225277 https://hal.science/hal-04225277/document https://hal.science/hal-04225277/file/tc-16-4931-2022.pdf https://doi.org/10.5194/tc-16-4931-2022 |
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ftunigrenoble:oai:HAL:hal-04225277v1 2024-05-12T07:54:19+00:00 An assessment of basal melt parameterisations for Antarctic ice shelves Burgard, Clara Jourdain, Nicolas, C Reese, Ronja Jenkins, Adrian Mathiot, Pierre Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) University of Northumbria at Newcastle United Kingdom 2022 https://hal.science/hal-04225277 https://hal.science/hal-04225277/document https://hal.science/hal-04225277/file/tc-16-4931-2022.pdf https://doi.org/10.5194/tc-16-4931-2022 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-16-4931-2022 hal-04225277 https://hal.science/hal-04225277 https://hal.science/hal-04225277/document https://hal.science/hal-04225277/file/tc-16-4931-2022.pdf doi:10.5194/tc-16-4931-2022 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04225277 The Cryosphere, 2022, 16 (12), pp.4931 - 4975. ⟨10.5194/tc-16-4931-2022⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2022 ftunigrenoble https://doi.org/10.5194/tc-16-4931-2022 2024-04-18T02:48:50Z International audience Ocean-induced ice-shelf melt is one of the largest uncertainty factors in the Antarctic contribution to future sealevel rise. Several parameterisations exist, linking oceanic properties in front of the ice shelf to melt at the base of the ice shelf, to force ice-sheet models. Here, we assess the potential of a range of these existing basal melt parameterisations to emulate basal melt rates simulated by a cavity-resolving ocean model on the circum-Antarctic scale. To do so, we perform two cross-validations, over time and over ice shelves respectively, and re-tune the parameterisations in a perfectmodel approach, to compare the melt rates produced by the newly tuned parameterisations to the melt rates simulated by the ocean model. We find that the quadratic dependence of melt to thermal forcing without dependency on the individual ice-shelf slope and the plume parameterisation yield the best compromise, in terms of integrated shelf melt and spatial patterns. The box parameterisation, which separates the sub-shelf circulation into boxes, the PICOP parameterisation, which combines the box and plume parameterisation, and quadratic parameterisations with dependency on the ice slope yield basal melt rates further from the model reference. The linear parameterisation cannot be recommended as the resulting integrated ice-shelf melt is comparably furthest from the reference. When using offshore hydrographic input fields in comparison to properties on the continental shelf, all parameterisations perform worse; however, the box and the slopedependent quadratic parameterisations yield the comparably best results. In addition to the new tuning, we provide uncertainty estimates for the tuned parameters. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere Université Grenoble Alpes: HAL Antarctic The Antarctic The Cryosphere 16 12 4931 4975 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Burgard, Clara Jourdain, Nicolas, C Reese, Ronja Jenkins, Adrian Mathiot, Pierre An assessment of basal melt parameterisations for Antarctic ice shelves |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Ocean-induced ice-shelf melt is one of the largest uncertainty factors in the Antarctic contribution to future sealevel rise. Several parameterisations exist, linking oceanic properties in front of the ice shelf to melt at the base of the ice shelf, to force ice-sheet models. Here, we assess the potential of a range of these existing basal melt parameterisations to emulate basal melt rates simulated by a cavity-resolving ocean model on the circum-Antarctic scale. To do so, we perform two cross-validations, over time and over ice shelves respectively, and re-tune the parameterisations in a perfectmodel approach, to compare the melt rates produced by the newly tuned parameterisations to the melt rates simulated by the ocean model. We find that the quadratic dependence of melt to thermal forcing without dependency on the individual ice-shelf slope and the plume parameterisation yield the best compromise, in terms of integrated shelf melt and spatial patterns. The box parameterisation, which separates the sub-shelf circulation into boxes, the PICOP parameterisation, which combines the box and plume parameterisation, and quadratic parameterisations with dependency on the ice slope yield basal melt rates further from the model reference. The linear parameterisation cannot be recommended as the resulting integrated ice-shelf melt is comparably furthest from the reference. When using offshore hydrographic input fields in comparison to properties on the continental shelf, all parameterisations perform worse; however, the box and the slopedependent quadratic parameterisations yield the comparably best results. In addition to the new tuning, we provide uncertainty estimates for the tuned parameters. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) University of Northumbria at Newcastle United Kingdom |
format |
Article in Journal/Newspaper |
author |
Burgard, Clara Jourdain, Nicolas, C Reese, Ronja Jenkins, Adrian Mathiot, Pierre |
author_facet |
Burgard, Clara Jourdain, Nicolas, C Reese, Ronja Jenkins, Adrian Mathiot, Pierre |
author_sort |
Burgard, Clara |
title |
An assessment of basal melt parameterisations for Antarctic ice shelves |
title_short |
An assessment of basal melt parameterisations for Antarctic ice shelves |
title_full |
An assessment of basal melt parameterisations for Antarctic ice shelves |
title_fullStr |
An assessment of basal melt parameterisations for Antarctic ice shelves |
title_full_unstemmed |
An assessment of basal melt parameterisations for Antarctic ice shelves |
title_sort |
assessment of basal melt parameterisations for antarctic ice shelves |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04225277 https://hal.science/hal-04225277/document https://hal.science/hal-04225277/file/tc-16-4931-2022.pdf https://doi.org/10.5194/tc-16-4931-2022 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04225277 The Cryosphere, 2022, 16 (12), pp.4931 - 4975. ⟨10.5194/tc-16-4931-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-16-4931-2022 hal-04225277 https://hal.science/hal-04225277 https://hal.science/hal-04225277/document https://hal.science/hal-04225277/file/tc-16-4931-2022.pdf doi:10.5194/tc-16-4931-2022 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-16-4931-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
12 |
container_start_page |
4931 |
op_container_end_page |
4975 |
_version_ |
1798848390440681472 |