Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica
Accurate glacial isostatic adjustment (GIA) modelling in the cryosphere is required for interpreting satellite, geophysical and geological records and for assessing the feedbacks of Earth deformation and sea-level change on marine ice-sheet grounding lines. GIA modelling in areas of active ice loss...
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061473 2023-05-15T13:24:15+02:00 Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica Wan, Jeannette Xiu Wen Gomez, Natalya Latychev, Konstantin Han, Holly Kyeore 2022-06 electronic https://doi.org/10.5194/tc-16-2203-2022 https://noa.gwlb.de/receive/cop_mods_00061473 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060937/tc-16-2203-2022.pdf https://tc.copernicus.org/articles/16/2203/2022/tc-16-2203-2022.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-2203-2022 https://noa.gwlb.de/receive/cop_mods_00061473 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060937/tc-16-2203-2022.pdf https://tc.copernicus.org/articles/16/2203/2022/tc-16-2203-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/tc-16-2203-2022 2022-06-19T23:11:42Z Accurate glacial isostatic adjustment (GIA) modelling in the cryosphere is required for interpreting satellite, geophysical and geological records and for assessing the feedbacks of Earth deformation and sea-level change on marine ice-sheet grounding lines. GIA modelling in areas of active ice loss in West Antarctica is particularly challenging because the ice is underlain by laterally varying mantle viscosities that are up to several orders of magnitude lower than the global average, leading to a faster and more localised response of the solid Earth to ongoing and future ice-sheet retreat and necessitating GIA models that incorporate 3-D viscoelastic Earth structure. Improvements to GIA models allow for computation of the viscoelastic response of the Earth to surface ice loading at sub-kilometre resolution, and ice-sheet models and observational products now provide the inputs to GIA models at comparably unprecedented detail. However, the resolution required to accurately capture GIA in models remains poorly understood, and high-resolution calculations come at heavy computational expense. We adopt a 3-D GIA model with a range of Earth structure models based on recent seismic tomography and geodetic data to perform a comprehensive analysis of the influence of grid resolution on predictions of GIA in the Amundsen Sea Embayment (ASE) in West Antarctica. Through idealised sensitivity testing down to sub-kilometre resolution with spatially isolated ice loading changes, we find that a grid resolution of ∼ 13 of the radius of the load or higher is required to accurately capture the elastic response of the Earth. However, when we consider more realistic, spatially coherent ice loss scenarios based on modern observational records and future ice-sheet model projections and adopt a viscoelastic Earth, we find that predicted deformation and sea-level change along the grounding line converge to within 5 % with grid resolutions of 7.5 km or higher, and to within 2 % for grid resolutions of 3.75 km and higher, even when the ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Ice Sheet The Cryosphere West Antarctica Niedersächsisches Online-Archiv NOA Amundsen Sea West Antarctica The Cryosphere 16 6 2203 2223 |
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article Verlagsveröffentlichung Wan, Jeannette Xiu Wen Gomez, Natalya Latychev, Konstantin Han, Holly Kyeore Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Accurate glacial isostatic adjustment (GIA) modelling in the cryosphere is required for interpreting satellite, geophysical and geological records and for assessing the feedbacks of Earth deformation and sea-level change on marine ice-sheet grounding lines. GIA modelling in areas of active ice loss in West Antarctica is particularly challenging because the ice is underlain by laterally varying mantle viscosities that are up to several orders of magnitude lower than the global average, leading to a faster and more localised response of the solid Earth to ongoing and future ice-sheet retreat and necessitating GIA models that incorporate 3-D viscoelastic Earth structure. Improvements to GIA models allow for computation of the viscoelastic response of the Earth to surface ice loading at sub-kilometre resolution, and ice-sheet models and observational products now provide the inputs to GIA models at comparably unprecedented detail. However, the resolution required to accurately capture GIA in models remains poorly understood, and high-resolution calculations come at heavy computational expense. We adopt a 3-D GIA model with a range of Earth structure models based on recent seismic tomography and geodetic data to perform a comprehensive analysis of the influence of grid resolution on predictions of GIA in the Amundsen Sea Embayment (ASE) in West Antarctica. Through idealised sensitivity testing down to sub-kilometre resolution with spatially isolated ice loading changes, we find that a grid resolution of ∼ 13 of the radius of the load or higher is required to accurately capture the elastic response of the Earth. However, when we consider more realistic, spatially coherent ice loss scenarios based on modern observational records and future ice-sheet model projections and adopt a viscoelastic Earth, we find that predicted deformation and sea-level change along the grounding line converge to within 5 % with grid resolutions of 7.5 km or higher, and to within 2 % for grid resolutions of 3.75 km and higher, even when the ... |
format |
Article in Journal/Newspaper |
author |
Wan, Jeannette Xiu Wen Gomez, Natalya Latychev, Konstantin Han, Holly Kyeore |
author_facet |
Wan, Jeannette Xiu Wen Gomez, Natalya Latychev, Konstantin Han, Holly Kyeore |
author_sort |
Wan, Jeannette Xiu Wen |
title |
Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica |
title_short |
Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica |
title_full |
Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica |
title_fullStr |
Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica |
title_full_unstemmed |
Resolving glacial isostatic adjustment (GIA) in response to modern and future ice loss at marine grounding lines in West Antarctica |
title_sort |
resolving glacial isostatic adjustment (gia) in response to modern and future ice loss at marine grounding lines in west antarctica |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-2203-2022 https://noa.gwlb.de/receive/cop_mods_00061473 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060937/tc-16-2203-2022.pdf https://tc.copernicus.org/articles/16/2203/2022/tc-16-2203-2022.pdf |
geographic |
Amundsen Sea West Antarctica |
geographic_facet |
Amundsen Sea West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica Ice Sheet The Cryosphere West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica Ice Sheet The Cryosphere West Antarctica |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-2203-2022 https://noa.gwlb.de/receive/cop_mods_00061473 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060937/tc-16-2203-2022.pdf https://tc.copernicus.org/articles/16/2203/2022/tc-16-2203-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-16-2203-2022 |
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The Cryosphere |
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16 |
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6 |
container_start_page |
2203 |
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2223 |
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1766378371518824448 |