Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow
Is groundwater abundant in Antarctica and does it modulate ice flow? Answering this question matters because ice streams flow by gliding over a wet substrate of till. Water fed to icestream beds thus influences ice-sheet dynamics and, potentially, sea-level rise. It is recognized that both till and...
Published in: | Geological Society, London, Special Publications |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/c293aaa3-761f-47c9-b519-37dc94d8dc7f 2023-05-15T13:41:30+02:00 Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow Siegert, Martin J. Kulessa, Bernd Bougamont, Marion Christoffersen, Poul Key, Kerry Andersen, Kristoffer R. Booth, Adam D. Smith, Andrew M. 2018 application/pdf https://pure.au.dk/portal/da/publications/antarctic-subglacial-groundwater(c293aaa3-761f-47c9-b519-37dc94d8dc7f).html https://doi.org/10.1144/SP461.8 https://pure.au.dk/ws/files/125432856/197.full.pdf eng eng info:eu-repo/semantics/openAccess Siegert , M J , Kulessa , B , Bougamont , M , Christoffersen , P , Key , K , Andersen , K R , Booth , A D & Smith , A M 2018 , ' Antarctic subglacial groundwater : A concept paper on its measurement and potential influence on ice flow ' , Geological Society Special Publication , vol. 461 , pp. 197-213 . https://doi.org/10.1144/SP461.8 article 2018 ftuniaarhuspubl https://doi.org/10.1144/SP461.8 2023-01-04T23:55:14Z Is groundwater abundant in Antarctica and does it modulate ice flow? Answering this question matters because ice streams flow by gliding over a wet substrate of till. Water fed to icestream beds thus influences ice-sheet dynamics and, potentially, sea-level rise. It is recognized that both till and the sedimentary basins from which it originates are porous and could host a reservoir of mobile groundwater that interacts with the subglacial interfacial system. According to recent numerical modelling, up to half of all water available for basal lubrication, and time lags between hydrological forcing and ice-sheet response as long as millennia, may have been overlooked in models of ice flow. Here, we review evidence in support of Antarctic groundwater and propose how it can be measured to ascertain the extent to which it modulates ice flow. We present new seismoelectric soundings of subglacial till, and magnetotelluric and transient electromagnetic forward models of subglacial groundwater reservoirs. We demonstrate that multifaceted and integrated geophysical datasets can detect, delineate and quantify the groundwater contents of subglacial sedimentary basins and, potentially, monitor groundwater exchange rates between subglacial till layers. The paper thus describes a new area of glaciological investigation and how it should progress in future. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Aarhus University: Research Antarctic Geological Society, London, Special Publications 461 1 197 213 |
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Open Polar |
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Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
Is groundwater abundant in Antarctica and does it modulate ice flow? Answering this question matters because ice streams flow by gliding over a wet substrate of till. Water fed to icestream beds thus influences ice-sheet dynamics and, potentially, sea-level rise. It is recognized that both till and the sedimentary basins from which it originates are porous and could host a reservoir of mobile groundwater that interacts with the subglacial interfacial system. According to recent numerical modelling, up to half of all water available for basal lubrication, and time lags between hydrological forcing and ice-sheet response as long as millennia, may have been overlooked in models of ice flow. Here, we review evidence in support of Antarctic groundwater and propose how it can be measured to ascertain the extent to which it modulates ice flow. We present new seismoelectric soundings of subglacial till, and magnetotelluric and transient electromagnetic forward models of subglacial groundwater reservoirs. We demonstrate that multifaceted and integrated geophysical datasets can detect, delineate and quantify the groundwater contents of subglacial sedimentary basins and, potentially, monitor groundwater exchange rates between subglacial till layers. The paper thus describes a new area of glaciological investigation and how it should progress in future. |
format |
Article in Journal/Newspaper |
author |
Siegert, Martin J. Kulessa, Bernd Bougamont, Marion Christoffersen, Poul Key, Kerry Andersen, Kristoffer R. Booth, Adam D. Smith, Andrew M. |
spellingShingle |
Siegert, Martin J. Kulessa, Bernd Bougamont, Marion Christoffersen, Poul Key, Kerry Andersen, Kristoffer R. Booth, Adam D. Smith, Andrew M. Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow |
author_facet |
Siegert, Martin J. Kulessa, Bernd Bougamont, Marion Christoffersen, Poul Key, Kerry Andersen, Kristoffer R. Booth, Adam D. Smith, Andrew M. |
author_sort |
Siegert, Martin J. |
title |
Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow |
title_short |
Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow |
title_full |
Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow |
title_fullStr |
Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow |
title_full_unstemmed |
Antarctic subglacial groundwater:A concept paper on its measurement and potential influence on ice flow |
title_sort |
antarctic subglacial groundwater:a concept paper on its measurement and potential influence on ice flow |
publishDate |
2018 |
url |
https://pure.au.dk/portal/da/publications/antarctic-subglacial-groundwater(c293aaa3-761f-47c9-b519-37dc94d8dc7f).html https://doi.org/10.1144/SP461.8 https://pure.au.dk/ws/files/125432856/197.full.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Siegert , M J , Kulessa , B , Bougamont , M , Christoffersen , P , Key , K , Andersen , K R , Booth , A D & Smith , A M 2018 , ' Antarctic subglacial groundwater : A concept paper on its measurement and potential influence on ice flow ' , Geological Society Special Publication , vol. 461 , pp. 197-213 . https://doi.org/10.1144/SP461.8 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1144/SP461.8 |
container_title |
Geological Society, London, Special Publications |
container_volume |
461 |
container_issue |
1 |
container_start_page |
197 |
op_container_end_page |
213 |
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1766151543371857920 |