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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ftdoajarticles:oai:doaj.org/article:7357052af0344604973421faf699ea13 2023-05-15T14:03:34+02:00 Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach M. Thoma K. Grosfeld C. Mayer F. Pattyn 2010-01-01T00:00:00Z https://doaj.org/article/7357052af0344604973421faf699ea13 EN eng Copernicus Publications http://www.the-cryosphere.net/4/1/2010/tc-4-1-2010.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 https://doaj.org/article/7357052af0344604973421faf699ea13 The Cryosphere, Vol 4, Iss 1, Pp 1-12 (2010) Environmental sciences GE1-350 Geology QE1-996.5 article 2010 ftdoajarticles 2022-12-31T08:46:09Z 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. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet The Cryosphere Directory of Open Access Journals: DOAJ Articles |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 M. Thoma K. Grosfeld C. Mayer F. Pattyn Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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. |
format |
Article in Journal/Newspaper |
author |
M. Thoma K. Grosfeld C. Mayer F. Pattyn |
author_facet |
M. Thoma K. Grosfeld C. Mayer F. Pattyn |
author_sort |
M. Thoma |
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 |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doaj.org/article/7357052af0344604973421faf699ea13 |
genre |
Antarc* Antarctica Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 4, Iss 1, Pp 1-12 (2010) |
op_relation |
http://www.the-cryosphere.net/4/1/2010/tc-4-1-2010.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 https://doaj.org/article/7357052af0344604973421faf699ea13 |
_version_ |
1766274262095626240 |