Modeling Antarctic subglacial lake filling and drainage cycles
The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis of ice surface altimetry data. We use a subglacial hydrology model applied to a synthetic Antarctic ice stream to examine internal controls on the filling and drainage of subglacial lakes. Our...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011913 2023-05-15T13:34:49+02:00 Modeling Antarctic subglacial lake filling and drainage cycles Dow, Christine F. Werder, Mauro A. Nowicki, Sophie Walker, Ryan T. 2016-07 electronic https://doi.org/10.5194/tc-10-1381-2016 https://noa.gwlb.de/receive/cop_mods_00011913 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011870/tc-10-1381-2016.pdf https://tc.copernicus.org/articles/10/1381/2016/tc-10-1381-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-1381-2016 https://noa.gwlb.de/receive/cop_mods_00011913 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011870/tc-10-1381-2016.pdf https://tc.copernicus.org/articles/10/1381/2016/tc-10-1381-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-1381-2016 2022-02-08T22:56:18Z The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis of ice surface altimetry data. We use a subglacial hydrology model applied to a synthetic Antarctic ice stream to examine internal controls on the filling and drainage of subglacial lakes. Our model outputs suggest that the highly constricted subglacial environment of our idealized ice stream, combined with relatively high rates of water flow funneled from a large catchment, can combine to create a system exhibiting slow-moving pressure waves. Over a period of years, the accumulation of water in the ice stream onset region results in a buildup of pressure creating temporary channels, which then evacuate the excess water. This increased flux of water beneath the ice stream drives lake growth. As the water body builds up, it steepens the hydraulic gradient out of the overdeepened lake basin and allows greater flux. Eventually this flux is large enough to melt channels that cause the lake to drain. Lake drainage also depends on the internal hydrological development in the wider system and therefore does not directly correspond to a particular water volume or depth. This creates a highly temporally and spatially variable system, which is of interest for assessing the importance of subglacial lakes in ice stream hydrology and dynamics. Article in Journal/Newspaper Antarc* Antarctic Antarctica The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic The Cryosphere 10 4 1381 1393 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Dow, Christine F. Werder, Mauro A. Nowicki, Sophie Walker, Ryan T. Modeling Antarctic subglacial lake filling and drainage cycles |
topic_facet |
article Verlagsveröffentlichung |
description |
The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis of ice surface altimetry data. We use a subglacial hydrology model applied to a synthetic Antarctic ice stream to examine internal controls on the filling and drainage of subglacial lakes. Our model outputs suggest that the highly constricted subglacial environment of our idealized ice stream, combined with relatively high rates of water flow funneled from a large catchment, can combine to create a system exhibiting slow-moving pressure waves. Over a period of years, the accumulation of water in the ice stream onset region results in a buildup of pressure creating temporary channels, which then evacuate the excess water. This increased flux of water beneath the ice stream drives lake growth. As the water body builds up, it steepens the hydraulic gradient out of the overdeepened lake basin and allows greater flux. Eventually this flux is large enough to melt channels that cause the lake to drain. Lake drainage also depends on the internal hydrological development in the wider system and therefore does not directly correspond to a particular water volume or depth. This creates a highly temporally and spatially variable system, which is of interest for assessing the importance of subglacial lakes in ice stream hydrology and dynamics. |
format |
Article in Journal/Newspaper |
author |
Dow, Christine F. Werder, Mauro A. Nowicki, Sophie Walker, Ryan T. |
author_facet |
Dow, Christine F. Werder, Mauro A. Nowicki, Sophie Walker, Ryan T. |
author_sort |
Dow, Christine F. |
title |
Modeling Antarctic subglacial lake filling and drainage cycles |
title_short |
Modeling Antarctic subglacial lake filling and drainage cycles |
title_full |
Modeling Antarctic subglacial lake filling and drainage cycles |
title_fullStr |
Modeling Antarctic subglacial lake filling and drainage cycles |
title_full_unstemmed |
Modeling Antarctic subglacial lake filling and drainage cycles |
title_sort |
modeling antarctic subglacial lake filling and drainage cycles |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-1381-2016 https://noa.gwlb.de/receive/cop_mods_00011913 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011870/tc-10-1381-2016.pdf https://tc.copernicus.org/articles/10/1381/2016/tc-10-1381-2016.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-1381-2016 https://noa.gwlb.de/receive/cop_mods_00011913 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011870/tc-10-1381-2016.pdf https://tc.copernicus.org/articles/10/1381/2016/tc-10-1381-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-1381-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
4 |
container_start_page |
1381 |
op_container_end_page |
1393 |
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