Investigating the stability of subglacial lakes with a full Stokes ice-sheet model
Despite the large amount of subglacial lakes present underneath the East Antarctic ice sheet and the melt processes involved, the hydrology beneath the ice sheet is poorly understood. Changes in subglacial potential gradients may lead to subglacial lake outbursts, discharging excess water through a...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/166757 2023-05-15T13:37:29+02:00 Investigating the stability of subglacial lakes with a full Stokes ice-sheet model Pattyn, Frank 2008 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/166757 https://dipot.ulb.ac.be/dspace/bitstream/2013/166757/3/doi_150387.pdf en eng uri/info:doi/10.3189/002214308784886171 uri/info:scp/46949094445 https://dipot.ulb.ac.be/dspace/bitstream/2013/166757/3/doi_150387.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/166757 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Journal of Glaciology, 54 (185 Géologie et minéralogie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2008 ftunivbruxelles 2022-06-12T22:09:17Z Despite the large amount of subglacial lakes present underneath the East Antarctic ice sheet and the melt processes involved, the hydrology beneath the ice sheet is poorly understood. Changes in subglacial potential gradients may lead to subglacial lake outbursts, discharging excess water through a subglacial drainage system underneath the ice sheet. Such processes can eventually lead to an increase in ice flow. In this paper, a full Stokes numerical ice-sheet model was employed which takes into account the ice flow over subglacial water bodies in hydrostatic equilibrium with the overlying ice. Sensitivity experiments were carried out for small perturbations in ice flow and basal melt rate as a function of ice thickness, general surface slope, ice viscosity and lake size, in order to investigate their influence on the subglacial potential gradient and the impact on subglacial lake drainage. Experiments clearly demonstrate that small changes in surface slope are sufficient to start and sustain episodic subglacial drainage events. Lake drainage can therefore be regarded as a common feature of the subglacial hydrological system and may influence, to a large extent, the present and future behavior of large ice sheets. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Journal of Glaciology DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic East Antarctic Ice Sheet |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géologie et minéralogie |
spellingShingle |
Géologie et minéralogie Pattyn, Frank Investigating the stability of subglacial lakes with a full Stokes ice-sheet model |
topic_facet |
Géologie et minéralogie |
description |
Despite the large amount of subglacial lakes present underneath the East Antarctic ice sheet and the melt processes involved, the hydrology beneath the ice sheet is poorly understood. Changes in subglacial potential gradients may lead to subglacial lake outbursts, discharging excess water through a subglacial drainage system underneath the ice sheet. Such processes can eventually lead to an increase in ice flow. In this paper, a full Stokes numerical ice-sheet model was employed which takes into account the ice flow over subglacial water bodies in hydrostatic equilibrium with the overlying ice. Sensitivity experiments were carried out for small perturbations in ice flow and basal melt rate as a function of ice thickness, general surface slope, ice viscosity and lake size, in order to investigate their influence on the subglacial potential gradient and the impact on subglacial lake drainage. Experiments clearly demonstrate that small changes in surface slope are sufficient to start and sustain episodic subglacial drainage events. Lake drainage can therefore be regarded as a common feature of the subglacial hydrological system and may influence, to a large extent, the present and future behavior of large ice sheets. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Pattyn, Frank |
author_facet |
Pattyn, Frank |
author_sort |
Pattyn, Frank |
title |
Investigating the stability of subglacial lakes with a full Stokes ice-sheet model |
title_short |
Investigating the stability of subglacial lakes with a full Stokes ice-sheet model |
title_full |
Investigating the stability of subglacial lakes with a full Stokes ice-sheet model |
title_fullStr |
Investigating the stability of subglacial lakes with a full Stokes ice-sheet model |
title_full_unstemmed |
Investigating the stability of subglacial lakes with a full Stokes ice-sheet model |
title_sort |
investigating the stability of subglacial lakes with a full stokes ice-sheet model |
publishDate |
2008 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/166757 https://dipot.ulb.ac.be/dspace/bitstream/2013/166757/3/doi_150387.pdf |
geographic |
Antarctic East Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, 54 (185 |
op_relation |
uri/info:doi/10.3189/002214308784886171 uri/info:scp/46949094445 https://dipot.ulb.ac.be/dspace/bitstream/2013/166757/3/doi_150387.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/166757 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766092502399451136 |