Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment
The Antarctic ice sheet (AIS) lies on a solid Earth that displays large spatial variations in rheological properties, with a thin lithosphere and low-viscosity upper mantle (weak Earth structure) beneath West Antarctica and an opposing structure beneath East Antarctica. This contrast is known to hav...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/328121 2024-04-28T07:58:15+00:00 Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment Coulon, Violaine Bulthuis, Kevin Whitehouse, Pippa L. Sun, Sainan Haubner, Konstanze Zipf, Lars Pattyn, Frank 2021-07-01 2 full-text file(s): application/pdf | application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/328121 https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/4/Coulon_et_al_2021.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/3/2020JF006003.pdf en eng uri/info:doi/10.1029/2020JF006003 uri/info:scp/85111702690 https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/4/Coulon_et_al_2021.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/3/2020JF006003.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/328121 2 full-text file(s): info:eu-repo/semantics/openAccess | info:eu-repo/semantics/openAccess Journal of Geophysical Research: Earth Surface, 126 (7 Sciences exactes et naturelles Antarctica ELRA GIA ice-sheet modeling Marine Ice Sheet Instability info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2021 ftunivbruxelles 2024-04-10T00:14:40Z The Antarctic ice sheet (AIS) lies on a solid Earth that displays large spatial variations in rheological properties, with a thin lithosphere and low-viscosity upper mantle (weak Earth structure) beneath West Antarctica and an opposing structure beneath East Antarctica. This contrast is known to have a significant impact on the ice-sheet grounding-line stability. Here, we embed within an ice-sheet model a modified glacial-isostatic Elastic Lithosphere-Relaxing Asthenosphere model that considers a dual pattern for the Earth structure beneath West and East Antarctica supplemented with an approximation of gravitationally consistent geoid changes, allowing to approximate near-field relative sea-level changes. We show that this elementary GIA model captures the essence of global Self-Gravitating Viscoelastic solid-Earth Models (SGVEMs) and compares well with both SGVEM outputs and geodetic observations, allowing to capture the essential features and processes influencing Antarctic grounding-line stability in a computationally efficient way. In this framework, we perform a probabilistic assessment of the impact of uncertainties in solid-Earth rheological properties on the response of the AIS to future warming. Results show that on multicentennial-to-millennial timescales, spatial variability in solid-Earth deformation plays a significant role in promoting the stability of the West Antarctic ice sheet (WAIS). However, WAIS collapse cannot be prevented under high-emissions climate scenarios. On longer timescales and for unmitigated climate scenarios, continent-wide mass loss projections may be underestimated because spatially uniform Earth models, as typically considered in numerical ice sheet models, will overestimate the stabilizing effect of GIA across East Antarctica, which is characterized by thick lithosphere and high upper-mantle viscosity. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles Antarctica ELRA GIA ice-sheet modeling Marine Ice Sheet Instability |
spellingShingle |
Sciences exactes et naturelles Antarctica ELRA GIA ice-sheet modeling Marine Ice Sheet Instability Coulon, Violaine Bulthuis, Kevin Whitehouse, Pippa L. Sun, Sainan Haubner, Konstanze Zipf, Lars Pattyn, Frank Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment |
topic_facet |
Sciences exactes et naturelles Antarctica ELRA GIA ice-sheet modeling Marine Ice Sheet Instability |
description |
The Antarctic ice sheet (AIS) lies on a solid Earth that displays large spatial variations in rheological properties, with a thin lithosphere and low-viscosity upper mantle (weak Earth structure) beneath West Antarctica and an opposing structure beneath East Antarctica. This contrast is known to have a significant impact on the ice-sheet grounding-line stability. Here, we embed within an ice-sheet model a modified glacial-isostatic Elastic Lithosphere-Relaxing Asthenosphere model that considers a dual pattern for the Earth structure beneath West and East Antarctica supplemented with an approximation of gravitationally consistent geoid changes, allowing to approximate near-field relative sea-level changes. We show that this elementary GIA model captures the essence of global Self-Gravitating Viscoelastic solid-Earth Models (SGVEMs) and compares well with both SGVEM outputs and geodetic observations, allowing to capture the essential features and processes influencing Antarctic grounding-line stability in a computationally efficient way. In this framework, we perform a probabilistic assessment of the impact of uncertainties in solid-Earth rheological properties on the response of the AIS to future warming. Results show that on multicentennial-to-millennial timescales, spatial variability in solid-Earth deformation plays a significant role in promoting the stability of the West Antarctic ice sheet (WAIS). However, WAIS collapse cannot be prevented under high-emissions climate scenarios. On longer timescales and for unmitigated climate scenarios, continent-wide mass loss projections may be underestimated because spatially uniform Earth models, as typically considered in numerical ice sheet models, will overestimate the stabilizing effect of GIA across East Antarctica, which is characterized by thick lithosphere and high upper-mantle viscosity. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Coulon, Violaine Bulthuis, Kevin Whitehouse, Pippa L. Sun, Sainan Haubner, Konstanze Zipf, Lars Pattyn, Frank |
author_facet |
Coulon, Violaine Bulthuis, Kevin Whitehouse, Pippa L. Sun, Sainan Haubner, Konstanze Zipf, Lars Pattyn, Frank |
author_sort |
Coulon, Violaine |
title |
Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment |
title_short |
Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment |
title_full |
Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment |
title_fullStr |
Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment |
title_full_unstemmed |
Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment |
title_sort |
contrasting response of west and east antarctic ice sheets to glacial isostatic adjustment |
publishDate |
2021 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/328121 https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/4/Coulon_et_al_2021.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/3/2020JF006003.pdf |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
op_source |
Journal of Geophysical Research: Earth Surface, 126 (7 |
op_relation |
uri/info:doi/10.1029/2020JF006003 uri/info:scp/85111702690 https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/4/Coulon_et_al_2021.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/328121/3/2020JF006003.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/328121 |
op_rights |
2 full-text file(s): info:eu-repo/semantics/openAccess | info:eu-repo/semantics/openAccess |
_version_ |
1797568469704638464 |