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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ftcopernicus:oai:publications.copernicus.org:egusphere107978 2023-05-15T13:38:41+02:00 Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle Calcar, Caroline Jacoba Wal, Roderik S. W. Blank, Bas Boer, Bas Wal, Wouter 2022-11-29 application/pdf https://doi.org/10.5194/egusphere-2022-1328 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1328/ eng eng doi:10.5194/egusphere-2022-1328 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1328/ eISSN: Text 2022 ftcopernicus https://doi.org/10.5194/egusphere-2022-1328 2022-12-05T17:22:43Z 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. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica Copernicus Publications: E-Journals Antarctic East Antarctica The Antarctic West Antarctica |
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Copernicus Publications: E-Journals |
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English |
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 |
Text |
author |
Calcar, Caroline Jacoba Wal, Roderik S. W. Blank, Bas Boer, Bas Wal, Wouter |
spellingShingle |
Calcar, Caroline Jacoba Wal, Roderik S. W. Blank, Bas Boer, Bas Wal, Wouter Simulation of a fully coupled 3D GIA – ice-sheet model for the Antarctic Ice Sheet over a glacial cycle |
author_facet |
Calcar, Caroline Jacoba Wal, Roderik S. W. Blank, Bas Boer, Bas Wal, Wouter |
author_sort |
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 |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-1328 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1328/ |
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_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-1328 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1328/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-1328 |
_version_ |
1766109701389418496 |