Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet
On glacial-interglacial time scales, isostatic effects of ice sheet volume changes may have a large impact on timingand magnitude of retreating and advancing ice through grounding-line migration. A common isostatic model usedin ice-flow modelling is the Elastic Lithosphere-Relaxed Asthenosphere (ELR...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/283591 2023-05-15T13:37:30+02:00 Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet Coulon, Violaine Pattyn, Frank EGU General Assembly 2018 (09/04/2018-13/04/2018: Vienne, Autriche) 2018-04-11 2 full-text file(s): application/pdf | application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/283591 https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/4/Abstract.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/3/Poster_EGU_2018_vcoulon.pdf en eng https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/4/Abstract.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/3/Poster_EGU_2018_vcoulon.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/283591 2 full-text file(s): info:eu-repo/semantics/restrictedAccess | info:eu-repo/semantics/restrictedAccess Glaciologie Géodynamique et tectonique Climatologie info:eu-repo/semantics/conferencePoster info:ulb-repo/semantics/conferencePoster info:ulb-repo/semantics/openurl/document 2018 ftunivbruxelles 2022-06-12T22:09:21Z On glacial-interglacial time scales, isostatic effects of ice sheet volume changes may have a large impact on timingand magnitude of retreating and advancing ice through grounding-line migration. A common isostatic model usedin ice-flow modelling is the Elastic Lithosphere-Relaxed Asthenosphere (ELRA) model. It considers an elasticlithosphere, defined by a given effective lithosphere thickness and a relaxation equation for asthenospheric responsewith a characteristic time scale as a function of asthenosphere viscosity. However, effective lithosphere thicknessin Antarctica ranges from tens (West-Antarctica) to hundreds of meters (East Antarctica), leading to a flexuralrigidity that varies spatially across several orders of magnitude. Furthermore, recent studies also point out to alarge spatial variability in asthenosphere viscosity. Here, we explore in a sensitivity analysis both spatially uniformand spatially varying values of flexural rigidity and asthenosphere viscosity applied to a model of the Antarcticice sheet, forced by background temperature and sea-level changes over the last 40,000 years, thus covering thelast glacial-interglacial transition. Results demonstrate a higher sensitivity for the West Antarctic ice sheet, whereasthenosphere viscosity essentially influences timing and magnitude of grounding-line retreat during the glacialinterglacialtransition. info:eu-repo/semantics/published Conference Object Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic East Antarctica The Antarctic West Antarctic Ice Sheet West Antarctica |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Glaciologie Géodynamique et tectonique Climatologie |
spellingShingle |
Glaciologie Géodynamique et tectonique Climatologie Coulon, Violaine Pattyn, Frank Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet |
topic_facet |
Glaciologie Géodynamique et tectonique Climatologie |
description |
On glacial-interglacial time scales, isostatic effects of ice sheet volume changes may have a large impact on timingand magnitude of retreating and advancing ice through grounding-line migration. A common isostatic model usedin ice-flow modelling is the Elastic Lithosphere-Relaxed Asthenosphere (ELRA) model. It considers an elasticlithosphere, defined by a given effective lithosphere thickness and a relaxation equation for asthenospheric responsewith a characteristic time scale as a function of asthenosphere viscosity. However, effective lithosphere thicknessin Antarctica ranges from tens (West-Antarctica) to hundreds of meters (East Antarctica), leading to a flexuralrigidity that varies spatially across several orders of magnitude. Furthermore, recent studies also point out to alarge spatial variability in asthenosphere viscosity. Here, we explore in a sensitivity analysis both spatially uniformand spatially varying values of flexural rigidity and asthenosphere viscosity applied to a model of the Antarcticice sheet, forced by background temperature and sea-level changes over the last 40,000 years, thus covering thelast glacial-interglacial transition. Results demonstrate a higher sensitivity for the West Antarctic ice sheet, whereasthenosphere viscosity essentially influences timing and magnitude of grounding-line retreat during the glacialinterglacialtransition. info:eu-repo/semantics/published |
author2 |
EGU General Assembly 2018 (09/04/2018-13/04/2018: Vienne, Autriche) |
format |
Conference Object |
author |
Coulon, Violaine Pattyn, Frank |
author_facet |
Coulon, Violaine Pattyn, Frank |
author_sort |
Coulon, Violaine |
title |
Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet |
title_short |
Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet |
title_full |
Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet |
title_fullStr |
Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet |
title_full_unstemmed |
Sensitivity of a spatially-varying Elastic Lithosphere-Relaxed Asthenosphere (ELRA) isostatic model of the Antarctic ice sheet |
title_sort |
sensitivity of a spatially-varying elastic lithosphere-relaxed asthenosphere (elra) isostatic model of the antarctic ice sheet |
publishDate |
2018 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/283591 https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/4/Abstract.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/3/Poster_EGU_2018_vcoulon.pdf |
geographic |
Antarctic East Antarctica The Antarctic West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic East Antarctica The Antarctic West Antarctic Ice Sheet 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://dipot.ulb.ac.be/dspace/bitstream/2013/283591/4/Abstract.pdf https://dipot.ulb.ac.be/dspace/bitstream/2013/283591/3/Poster_EGU_2018_vcoulon.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/283591 |
op_rights |
2 full-text file(s): info:eu-repo/semantics/restrictedAccess | info:eu-repo/semantics/restrictedAccess |
_version_ |
1766092622552629248 |