Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0)
Changes in ocean-driven basal melting have a key influence on the stability of ice shelves, the mass loss from the ice sheet, ocean circulation, and global sea level rise. Coupled ice sheetocean models play a critical role in understanding future ice sheet evolution and examining the processes gover...
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Online Access: | https://doi.org/10.5194/gmd-15-5421-2022 http://ecite.utas.edu.au/151500 |
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ftunivtasecite:oai:ecite.utas.edu.au:151500 2023-05-15T16:39:57+02:00 Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) Zhao, C Gladstone, R Galton-Fenzi, BK Gwyther, D Hattermann, T 2022 application/pdf https://doi.org/10.5194/gmd-15-5421-2022 http://ecite.utas.edu.au/151500 en eng Copernicus GmbH http://ecite.utas.edu.au/151500/1/151500 - Evaluation of an emergent feature of sub-shelf melt oscillations.pdf http://dx.doi.org/10.5194/gmd-15-5421-2022 Zhao, C and Gladstone, R and Galton-Fenzi, BK and Gwyther, D and Hattermann, T, Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0), Geoscientific Model Development, 15, (13) pp. 5421-5439. ISSN 1991-959X (2022) [Refereed Article] http://ecite.utas.edu.au/151500 Earth Sciences Other earth sciences Earth system sciences Refereed Article PeerReviewed 2022 ftunivtasecite https://doi.org/10.5194/gmd-15-5421-2022 2022-11-21T23:17:12Z Changes in ocean-driven basal melting have a key influence on the stability of ice shelves, the mass loss from the ice sheet, ocean circulation, and global sea level rise. Coupled ice sheetocean models play a critical role in understanding future ice sheet evolution and examining the processes governing ice sheet responses to basal melting. However, as a new approach, coupled ice sheetocean systems come with new challenges, and the impacts of solutions implemented to date have not been investigated. An emergent feature in several contributing coupled models to the 1st Marine Ice SheetOcean Model Intercomparison Project (MISOMIP1) was a time-varying oscillation in basal melt rates. Here, we use a recently developed coupling framework, FISOC (v1.1), to connect the modified ocean model ROMSIceShelf (v1.0) and ice sheet model Elmer/Ice (v9.0), to investigate the origin and implications of the feature and, more generally, the impact of coupled modeling strategies on the simulated basal melt in an idealized ice shelf cavity based on the MISOMIP setup. We found the spatial-averaged basal melt rates (3.56 m yr −1 ) oscillated with an amplitude ∼0.7 m yr −1 and approximate period of ∼6 years between year30 and 100 depending on the experimental design. The melt oscillations emerged in the coupled system and the standalone ocean model using a prescribed change of cavity geometry. We found that the oscillation feature is closely related to the discretized ungrounding of the ice sheet, exposing new ocean, and is likely strengthened by a combination of positive buoyancymelt feedback and/or meltgeometry feedback near the grounding line, and the frequent coupling of ice geometry and ocean evolution. Sensitivity tests demonstrate that the oscillation feature is always present, regardless of the choice of coupling interval, vertical resolution in the ocean model, tracer properties of cells ungrounded by the retreating ice sheet, or the dependency of friction velocities to the vertical resolution. However, the amplitude, phase, ... Article in Journal/Newspaper Ice Sheet Ice Shelf Ice Shelves eCite UTAS (University of Tasmania) Geoscientific Model Development 15 13 5421 5439 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Other earth sciences Earth system sciences |
spellingShingle |
Earth Sciences Other earth sciences Earth system sciences Zhao, C Gladstone, R Galton-Fenzi, BK Gwyther, D Hattermann, T Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) |
topic_facet |
Earth Sciences Other earth sciences Earth system sciences |
description |
Changes in ocean-driven basal melting have a key influence on the stability of ice shelves, the mass loss from the ice sheet, ocean circulation, and global sea level rise. Coupled ice sheetocean models play a critical role in understanding future ice sheet evolution and examining the processes governing ice sheet responses to basal melting. However, as a new approach, coupled ice sheetocean systems come with new challenges, and the impacts of solutions implemented to date have not been investigated. An emergent feature in several contributing coupled models to the 1st Marine Ice SheetOcean Model Intercomparison Project (MISOMIP1) was a time-varying oscillation in basal melt rates. Here, we use a recently developed coupling framework, FISOC (v1.1), to connect the modified ocean model ROMSIceShelf (v1.0) and ice sheet model Elmer/Ice (v9.0), to investigate the origin and implications of the feature and, more generally, the impact of coupled modeling strategies on the simulated basal melt in an idealized ice shelf cavity based on the MISOMIP setup. We found the spatial-averaged basal melt rates (3.56 m yr −1 ) oscillated with an amplitude ∼0.7 m yr −1 and approximate period of ∼6 years between year30 and 100 depending on the experimental design. The melt oscillations emerged in the coupled system and the standalone ocean model using a prescribed change of cavity geometry. We found that the oscillation feature is closely related to the discretized ungrounding of the ice sheet, exposing new ocean, and is likely strengthened by a combination of positive buoyancymelt feedback and/or meltgeometry feedback near the grounding line, and the frequent coupling of ice geometry and ocean evolution. Sensitivity tests demonstrate that the oscillation feature is always present, regardless of the choice of coupling interval, vertical resolution in the ocean model, tracer properties of cells ungrounded by the retreating ice sheet, or the dependency of friction velocities to the vertical resolution. However, the amplitude, phase, ... |
format |
Article in Journal/Newspaper |
author |
Zhao, C Gladstone, R Galton-Fenzi, BK Gwyther, D Hattermann, T |
author_facet |
Zhao, C Gladstone, R Galton-Fenzi, BK Gwyther, D Hattermann, T |
author_sort |
Zhao, C |
title |
Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) |
title_short |
Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) |
title_full |
Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) |
title_fullStr |
Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) |
title_full_unstemmed |
Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) |
title_sort |
evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using fisoc (v1.1) - romsiceshelf (v1.0) - elmer/ice (v9.0) |
publisher |
Copernicus GmbH |
publishDate |
2022 |
url |
https://doi.org/10.5194/gmd-15-5421-2022 http://ecite.utas.edu.au/151500 |
genre |
Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Ice Sheet Ice Shelf Ice Shelves |
op_relation |
http://ecite.utas.edu.au/151500/1/151500 - Evaluation of an emergent feature of sub-shelf melt oscillations.pdf http://dx.doi.org/10.5194/gmd-15-5421-2022 Zhao, C and Gladstone, R and Galton-Fenzi, BK and Gwyther, D and Hattermann, T, Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0), Geoscientific Model Development, 15, (13) pp. 5421-5439. ISSN 1991-959X (2022) [Refereed Article] http://ecite.utas.edu.au/151500 |
op_doi |
https://doi.org/10.5194/gmd-15-5421-2022 |
container_title |
Geoscientific Model Development |
container_volume |
15 |
container_issue |
13 |
container_start_page |
5421 |
op_container_end_page |
5439 |
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1766030304666976256 |