Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle
Glacial Isostatic Adjustment (GIA) has a stabilizing effect on the evolution of the Antarctic Ice Sheet by reducing the grounding line migration that follows ice melt. The timescale and strength of this feedback depend on the spatially varying viscosity of the Earth’s mantle. Most studies assume a r...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00063681 2023-05-15T13:49:22+02:00 Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle van Calcar, Caroline Jacoba van de Wal, Roderik S. W. Blank, Bas de Boer, Bas van der Wal, Wouter 2022-11 electronic https://doi.org/10.5194/egusphere-2022-1328 https://noa.gwlb.de/receive/cop_mods_00063681 https://egusphere.copernicus.org/preprints/egusphere-2022-1328/egusphere-2022-1328.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-1328 https://noa.gwlb.de/receive/cop_mods_00063681 https://egusphere.copernicus.org/preprints/egusphere-2022-1328/egusphere-2022-1328.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-1328 2022-12-05T00:12:19Z Glacial Isostatic Adjustment (GIA) has a stabilizing effect on the evolution of the Antarctic Ice Sheet by reducing the grounding line migration that follows ice melt. The timescale and strength of this feedback depend on the spatially varying viscosity of the Earth’s mantle. Most studies assume a relatively high laterally homogenous response time of the bedrock. However, viscosity is spatially variable with a high viscosity beneath East Antarctica, and a low viscosity beneath West Antarctica. For this study, we have developed a new method to couple a 3D GIA model and an ice-sheet model to study the interaction between the Solid Earth and the Antarctic Ice Sheet during the last glacial cycle. The feedback effect into account on a high temporal resolution by using coupling time steps of 500 years. We applied the method using the ice-sheet model ANICE, a 3D GIA FE model, and results from a seismic model to determine the patterns in the viscosity. The results of simulations over the Last Glacial Cycle show that differences in viscosity of an order of magnitude can lead to differences in grounding line position up to 500 km, to differences in ice thickness in the order of 1.5 km. These results underline and quantify the importance of including local GIA feedback effects in ice-sheet models when simulating the Antarctic Ice Sheet evolution over the Last Glacial Cycle. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica Niedersächsisches Online-Archiv NOA Antarctic East Antarctica The Antarctic West Antarctica |
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Niedersächsisches Online-Archiv NOA |
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language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung van Calcar, Caroline Jacoba van de Wal, Roderik S. W. Blank, Bas de Boer, Bas van der Wal, Wouter Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
topic_facet |
article Verlagsveröffentlichung |
description |
Glacial Isostatic Adjustment (GIA) has a stabilizing effect on the evolution of the Antarctic Ice Sheet by reducing the grounding line migration that follows ice melt. The timescale and strength of this feedback depend on the spatially varying viscosity of the Earth’s mantle. Most studies assume a relatively high laterally homogenous response time of the bedrock. However, viscosity is spatially variable with a high viscosity beneath East Antarctica, and a low viscosity beneath West Antarctica. For this study, we have developed a new method to couple a 3D GIA model and an ice-sheet model to study the interaction between the Solid Earth and the Antarctic Ice Sheet during the last glacial cycle. The feedback effect into account on a high temporal resolution by using coupling time steps of 500 years. We applied the method using the ice-sheet model ANICE, a 3D GIA FE model, and results from a seismic model to determine the patterns in the viscosity. The results of simulations over the Last Glacial Cycle show that differences in viscosity of an order of magnitude can lead to differences in grounding line position up to 500 km, to differences in ice thickness in the order of 1.5 km. These results underline and quantify the importance of including local GIA feedback effects in ice-sheet models when simulating the Antarctic Ice Sheet evolution over the Last Glacial Cycle. |
format |
Article in Journal/Newspaper |
author |
van Calcar, Caroline Jacoba van de Wal, Roderik S. W. Blank, Bas de Boer, Bas van der Wal, Wouter |
author_facet |
van Calcar, Caroline Jacoba van de Wal, Roderik S. W. Blank, Bas de Boer, Bas van der Wal, Wouter |
author_sort |
van Calcar, Caroline Jacoba |
title |
Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
title_short |
Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
title_full |
Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
title_fullStr |
Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
title_full_unstemmed |
Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
title_sort |
simulation of a fully coupled 3d gia – ice-sheet model for the antarctic ice sheet over a glacial cycle |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-1328 https://noa.gwlb.de/receive/cop_mods_00063681 https://egusphere.copernicus.org/preprints/egusphere-2022-1328/egusphere-2022-1328.pdf |
geographic |
Antarctic East Antarctica The Antarctic West Antarctica |
geographic_facet |
Antarctic East Antarctica The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
op_relation |
https://doi.org/10.5194/egusphere-2022-1328 https://noa.gwlb.de/receive/cop_mods_00063681 https://egusphere.copernicus.org/preprints/egusphere-2022-1328/egusphere-2022-1328.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-1328 |
_version_ |
1766251245776928768 |