Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr
Deformation of the lithosphere under an ice load can be approximated using the hypothesis of local damped isostasy. This simple formulation has been systematically compared with a three-dimensional model of the crust-mantle system for simple ice-load scenarios with a period in the range 20-100 kyr....
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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Online Access: | http://hdl.handle.net/2078.1/42938 https://doi.org/10.1016/S0012-821X(00)00361-7 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:42938 2024-05-12T08:05:22+00:00 Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr Crucifix, Michel Loutre, Marie-France Lambeck, K Berger, André UCL - SC/PHYS - Département de physique 2001 http://hdl.handle.net/2078.1/42938 https://doi.org/10.1016/S0012-821X(00)00361-7 eng eng Elsevier Science Bv boreal:42938 http://hdl.handle.net/2078.1/42938 doi:10.1016/S0012-821X(00)00361-7 urn:ISSN:0012-821X urn:EISSN:1385-013X info:eu-repo/semantics/restrictedAccess Earth and Planetary Science Letters, Vol. 184, no. 3-4, p. 623-633 (2001) glacial rebound cycles climate models info:eu-repo/semantics/article 2001 ftunivlouvain https://doi.org/10.1016/S0012-821X(00)00361-7 2024-04-17T17:31:57Z Deformation of the lithosphere under an ice load can be approximated using the hypothesis of local damped isostasy. This simple formulation has been systematically compared with a three-dimensional model of the crust-mantle system for simple ice-load scenarios with a period in the range 20-100 kyr. The comparison enables us to introduce the concepts of effective upper mantle density and effective relaxation time into the isostatic model for the response of the Earth to the ice sheets. These parameters depend on the Earth model considered, ice sheet size and the period of the load cycle. The local damped isostasy model has been implemented in the Louvain-la-Neuve climate model to assess the impact of isostasy on continental ice volume variations for the last 200 kyr. Results suggest that isostasy acts as a negative feedback for ice volume during the glaciation process and acts as a positive feedback during the deglaciation. Moreover, taking isostasy into account is necessary to simulate variations in Northern Hemisphere ice volume during isotopic stage 3. Lastly, the use of effective mantle density and effective relaxation time improves the model performance regarding SPECMAP reconstructions. (C) 2001 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Ice Sheet DIAL@UCLouvain (Université catholique de Louvain) Earth and Planetary Science Letters 184 3-4 623 633 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
glacial rebound cycles climate models |
spellingShingle |
glacial rebound cycles climate models Crucifix, Michel Loutre, Marie-France Lambeck, K Berger, André Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
topic_facet |
glacial rebound cycles climate models |
description |
Deformation of the lithosphere under an ice load can be approximated using the hypothesis of local damped isostasy. This simple formulation has been systematically compared with a three-dimensional model of the crust-mantle system for simple ice-load scenarios with a period in the range 20-100 kyr. The comparison enables us to introduce the concepts of effective upper mantle density and effective relaxation time into the isostatic model for the response of the Earth to the ice sheets. These parameters depend on the Earth model considered, ice sheet size and the period of the load cycle. The local damped isostasy model has been implemented in the Louvain-la-Neuve climate model to assess the impact of isostasy on continental ice volume variations for the last 200 kyr. Results suggest that isostasy acts as a negative feedback for ice volume during the glaciation process and acts as a positive feedback during the deglaciation. Moreover, taking isostasy into account is necessary to simulate variations in Northern Hemisphere ice volume during isotopic stage 3. Lastly, the use of effective mantle density and effective relaxation time improves the model performance regarding SPECMAP reconstructions. (C) 2001 Elsevier Science B.V. All rights reserved. |
author2 |
UCL - SC/PHYS - Département de physique |
format |
Article in Journal/Newspaper |
author |
Crucifix, Michel Loutre, Marie-France Lambeck, K Berger, André |
author_facet |
Crucifix, Michel Loutre, Marie-France Lambeck, K Berger, André |
author_sort |
Crucifix, Michel |
title |
Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
title_short |
Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
title_full |
Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
title_fullStr |
Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
title_full_unstemmed |
Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
title_sort |
effect of isostatic rebound on modelled ice volume variations during the last 200 kyr |
publisher |
Elsevier Science Bv |
publishDate |
2001 |
url |
http://hdl.handle.net/2078.1/42938 https://doi.org/10.1016/S0012-821X(00)00361-7 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Earth and Planetary Science Letters, Vol. 184, no. 3-4, p. 623-633 (2001) |
op_relation |
boreal:42938 http://hdl.handle.net/2078.1/42938 doi:10.1016/S0012-821X(00)00361-7 urn:ISSN:0012-821X urn:EISSN:1385-013X |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0012-821X(00)00361-7 |
container_title |
Earth and Planetary Science Letters |
container_volume |
184 |
container_issue |
3-4 |
container_start_page |
623 |
op_container_end_page |
633 |
_version_ |
1798847659698552832 |