Greenland subglacial drainage evolution regulated by weakly connected regions of the bed
Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/124714 2023-08-20T04:06:51+02:00 Greenland subglacial drainage evolution regulated by weakly connected regions of the bed Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen F. Catania, Ginny A. Neumann, Thomas A. Lüthi, Martin P. Gulley, Jason Ryser, Claudia Hawley, Robert L. Morriss, Blaine 2016 application/application/pdf https://hdl.handle.net/20.500.11850/124714 https://doi.org/10.3929/ethz-b-000124714 en eng Nature info:eu-repo/semantics/altIdentifier/doi/10.1038/ncomms13903 info:eu-repo/semantics/altIdentifier/wos/000389882400001 http://hdl.handle.net/20.500.11850/124714 doi:10.3929/ethz-b-000124714 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Nature Communications, 7 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftethz https://doi.org/20.500.11850/12471410.3929/ethz-b-00012471410.1038/ncomms13903 2023-07-30T23:48:45Z Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution of the subglacial drainage system from an inefficient distributed to efficient channelized configuration, mounting evidence indicates that subglacial channels are unable to explain important aspects of hydrodynamic coupling in late summer and fall. Here we use numerical models of subglacial drainage and ice flow to show that limited, gradual leakage of water and lowering of water pressure in weakly connected regions of the bed can explain the dominant features in late and post melt season ice dynamics. These results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology. ISSN:2041-1723 Article in Journal/Newspaper Greenland Ice Sheet ETH Zürich Research Collection Greenland |
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Open Polar |
collection |
ETH Zürich Research Collection |
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ftethz |
language |
English |
description |
Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution of the subglacial drainage system from an inefficient distributed to efficient channelized configuration, mounting evidence indicates that subglacial channels are unable to explain important aspects of hydrodynamic coupling in late summer and fall. Here we use numerical models of subglacial drainage and ice flow to show that limited, gradual leakage of water and lowering of water pressure in weakly connected regions of the bed can explain the dominant features in late and post melt season ice dynamics. These results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology. ISSN:2041-1723 |
format |
Article in Journal/Newspaper |
author |
Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen F. Catania, Ginny A. Neumann, Thomas A. Lüthi, Martin P. Gulley, Jason Ryser, Claudia Hawley, Robert L. Morriss, Blaine |
spellingShingle |
Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen F. Catania, Ginny A. Neumann, Thomas A. Lüthi, Martin P. Gulley, Jason Ryser, Claudia Hawley, Robert L. Morriss, Blaine Greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
author_facet |
Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen F. Catania, Ginny A. Neumann, Thomas A. Lüthi, Martin P. Gulley, Jason Ryser, Claudia Hawley, Robert L. Morriss, Blaine |
author_sort |
Hoffman, Matthew J. |
title |
Greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
title_short |
Greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
title_full |
Greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
title_fullStr |
Greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
title_full_unstemmed |
Greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
title_sort |
greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
publisher |
Nature |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.11850/124714 https://doi.org/10.3929/ethz-b-000124714 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Nature Communications, 7 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ncomms13903 info:eu-repo/semantics/altIdentifier/wos/000389882400001 http://hdl.handle.net/20.500.11850/124714 doi:10.3929/ethz-b-000124714 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/12471410.3929/ethz-b-00012471410.1038/ncomms13903 |
_version_ |
1774718199927930880 |