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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ftpubmed:oai:pubmedcentral.nih.gov:5187425 2023-05-15T16:27:13+02:00 Greenland subglacial drainage evolution regulated by weakly connected regions of the bed Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen A. Catania, Ginny A. Neumann, Thomas A. Lüthi, Martin P. Gulley, Jason Ryser, Claudia Hawley, Robert L. Morriss, Blaine 2016-12-19 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5187425/ http://www.ncbi.nlm.nih.gov/pubmed/27991518 https://doi.org/10.1038/ncomms13903 en eng Nature Publishing Group http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5187425/ http://www.ncbi.nlm.nih.gov/pubmed/27991518 http://dx.doi.org/10.1038/ncomms13903 Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ CC-BY Article Text 2016 ftpubmed https://doi.org/10.1038/ncomms13903 2017-01-08T01:27:29Z 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. Text Greenland Ice Sheet PubMed Central (PMC) Greenland Nature Communications 7 1 |
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Article Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen A. 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 |
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Article |
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. |
format |
Text |
author |
Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen A. Catania, Ginny A. Neumann, Thomas A. Lüthi, Martin P. Gulley, Jason Ryser, Claudia Hawley, Robert L. Morriss, Blaine |
author_facet |
Hoffman, Matthew J. Andrews, Lauren C. Price, Stephen A. 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 Publishing Group |
publishDate |
2016 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5187425/ http://www.ncbi.nlm.nih.gov/pubmed/27991518 https://doi.org/10.1038/ncomms13903 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5187425/ http://www.ncbi.nlm.nih.gov/pubmed/27991518 http://dx.doi.org/10.1038/ncomms13903 |
op_rights |
Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
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CC-BY |
op_doi |
https://doi.org/10.1038/ncomms13903 |
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Nature Communications |
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7 |
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1 |
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1766016329355100160 |