Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach
Subglacial lakes in Antarctica influence to a large extent the flow of the ice sheet. In this study we use an idealised lake geometry to study this impact. We employ a) an improved three-dimensional full-Stokes ice flow model with a nonlinear rheology, b) a three-dimensional fluid dynamics model wit...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/120139 2023-05-15T13:37:29+02:00 Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach Thoma, M Grosfeld, K Mayer, Colombine Pattyn, Frank 2010 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/120139 https://dipot.ulb.ac.be/dspace/bitstream/2013/120139/3/doi_101033.pdf en eng uri/info:doi/10.5194/tc-4-1-2010 uri/info:scp/79960548859 https://dipot.ulb.ac.be/dspace/bitstream/2013/120139/3/doi_101033.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/120139 1 full-text file(s): info:eu-repo/semantics/openAccess The Cryosphere, 4 (1 Glaciologie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2010 ftunivbruxelles 2022-06-12T22:09:17Z Subglacial lakes in Antarctica influence to a large extent the flow of the ice sheet. In this study we use an idealised lake geometry to study this impact. We employ a) an improved three-dimensional full-Stokes ice flow model with a nonlinear rheology, b) a three-dimensional fluid dynamics model with eddy diffusion to simulate the basal mass balance at the lake-ice interface, and c) a newly developed coupler to exchange boundary conditions between the two individual models. Different boundary conditions are applied over grounded ice and floating ice. This results in significantly increased temperatures within the ice on top of the lake, compared to ice at the same depth outside the lake area. Basal melting of the ice sheet increases this lateral temperature gradient. Upstream the ice flow converges towards the lake and accelerates by about 10% whenever basal melting at the ice-lake boundary is present. Above and downstream of the lake, where the ice flow diverges, a velocity decrease of about 10% is simulated. © 2010 Author(s). SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctica Ice Sheet The Cryosphere DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
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Open Polar |
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DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Glaciologie |
spellingShingle |
Glaciologie Thoma, M Grosfeld, K Mayer, Colombine Pattyn, Frank Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
topic_facet |
Glaciologie |
description |
Subglacial lakes in Antarctica influence to a large extent the flow of the ice sheet. In this study we use an idealised lake geometry to study this impact. We employ a) an improved three-dimensional full-Stokes ice flow model with a nonlinear rheology, b) a three-dimensional fluid dynamics model with eddy diffusion to simulate the basal mass balance at the lake-ice interface, and c) a newly developed coupler to exchange boundary conditions between the two individual models. Different boundary conditions are applied over grounded ice and floating ice. This results in significantly increased temperatures within the ice on top of the lake, compared to ice at the same depth outside the lake area. Basal melting of the ice sheet increases this lateral temperature gradient. Upstream the ice flow converges towards the lake and accelerates by about 10% whenever basal melting at the ice-lake boundary is present. Above and downstream of the lake, where the ice flow diverges, a velocity decrease of about 10% is simulated. © 2010 Author(s). SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Thoma, M Grosfeld, K Mayer, Colombine Pattyn, Frank |
author_facet |
Thoma, M Grosfeld, K Mayer, Colombine Pattyn, Frank |
author_sort |
Thoma, M |
title |
Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
title_short |
Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
title_full |
Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
title_fullStr |
Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
title_full_unstemmed |
Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
title_sort |
interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
publishDate |
2010 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/120139 https://dipot.ulb.ac.be/dspace/bitstream/2013/120139/3/doi_101033.pdf |
genre |
Antarc* Antarctica Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica Ice Sheet The Cryosphere |
op_source |
The Cryosphere, 4 (1 |
op_relation |
uri/info:doi/10.5194/tc-4-1-2010 uri/info:scp/79960548859 https://dipot.ulb.ac.be/dspace/bitstream/2013/120139/3/doi_101033.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/120139 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766092463719579648 |