Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon
The subglacial drainage system is one of the main controls on basal sliding, but remains only partially understood. Here we use an 8-year dataset of borehole observations on a small, alpine polythermal valley glacier in the Yukon Territory to assess qualitatively how well the established understandi...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00005098 2023-05-15T18:32:32+02:00 Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon Rada, Camilo Schoof, Christian 2018-08 electronic https://doi.org/10.5194/tc-12-2609-2018 https://noa.gwlb.de/receive/cop_mods_00005098 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005055/tc-12-2609-2018.pdf https://tc.copernicus.org/articles/12/2609/2018/tc-12-2609-2018.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-12-2609-2018 https://noa.gwlb.de/receive/cop_mods_00005098 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005055/tc-12-2609-2018.pdf https://tc.copernicus.org/articles/12/2609/2018/tc-12-2609-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/tc-12-2609-2018 2022-02-08T22:59:45Z The subglacial drainage system is one of the main controls on basal sliding, but remains only partially understood. Here we use an 8-year dataset of borehole observations on a small, alpine polythermal valley glacier in the Yukon Territory to assess qualitatively how well the established understanding of drainage physics explains the observed temporal evolution and spatial configuration of the drainage system. We find that the standard picture of a channelizing drainage system that evolves towards higher effective pressure explains many features of the dataset. However, our dataset underlines the importance of hydraulic isolation of parts of the bed. We observe how disconnected portions of the bed systematically grow towards the end of the summer season, causing the drainage system to fragment into progressively more distinct subsystems. We conclude with an adaptation of existing drainage models that aims to capture the ability of parts of the bed to become hydraulically disconnected due to basal cavities of finite size becoming disconnected from each other as they shrink. Article in Journal/Newspaper The Cryosphere Yukon Niedersächsisches Online-Archiv NOA Yukon The Cryosphere 12 8 2609 2636 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Rada, Camilo Schoof, Christian Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon |
topic_facet |
article Verlagsveröffentlichung |
description |
The subglacial drainage system is one of the main controls on basal sliding, but remains only partially understood. Here we use an 8-year dataset of borehole observations on a small, alpine polythermal valley glacier in the Yukon Territory to assess qualitatively how well the established understanding of drainage physics explains the observed temporal evolution and spatial configuration of the drainage system. We find that the standard picture of a channelizing drainage system that evolves towards higher effective pressure explains many features of the dataset. However, our dataset underlines the importance of hydraulic isolation of parts of the bed. We observe how disconnected portions of the bed systematically grow towards the end of the summer season, causing the drainage system to fragment into progressively more distinct subsystems. We conclude with an adaptation of existing drainage models that aims to capture the ability of parts of the bed to become hydraulically disconnected due to basal cavities of finite size becoming disconnected from each other as they shrink. |
format |
Article in Journal/Newspaper |
author |
Rada, Camilo Schoof, Christian |
author_facet |
Rada, Camilo Schoof, Christian |
author_sort |
Rada, Camilo |
title |
Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon |
title_short |
Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon |
title_full |
Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon |
title_fullStr |
Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon |
title_full_unstemmed |
Channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the Yukon |
title_sort |
channelized, distributed, and disconnected: subglacial drainage under a valley glacier in the yukon |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-2609-2018 https://noa.gwlb.de/receive/cop_mods_00005098 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005055/tc-12-2609-2018.pdf https://tc.copernicus.org/articles/12/2609/2018/tc-12-2609-2018.pdf |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
The Cryosphere Yukon |
genre_facet |
The Cryosphere Yukon |
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-12-2609-2018 https://noa.gwlb.de/receive/cop_mods_00005098 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005055/tc-12-2609-2018.pdf https://tc.copernicus.org/articles/12/2609/2018/tc-12-2609-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-12-2609-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
8 |
container_start_page |
2609 |
op_container_end_page |
2636 |
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1766216660549632000 |