A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland
Basal sliding is a main control on glacier flow primarily driven by water pressure at the glacier base. The ongoing increase in surface melting of the Greenland Ice Sheet warrants an examination of its impact on basal water pressure and in turn on basal sliding. Here we examine the case of Russell G...
Published in: | Journal of Geophysical Research: Earth Surface |
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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2016
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Online Access: | https://hdl.handle.net/1983/dd8f867d-3eb4-49a9-a156-848a0729f012 https://research-information.bris.ac.uk/en/publications/dd8f867d-3eb4-49a9-a156-848a0729f012 https://doi.org/10.1002/2016JF003842 https://research-information.bris.ac.uk/ws/files/139513830/Full_text_PDF_final_published_version_.pdf http://www.scopus.com/inward/record.url?scp=84991461433&partnerID=8YFLogxK |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/dd8f867d-3eb4-49a9-a156-848a0729f012 2024-01-28T10:05:54+01:00 A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland de Fleurian, Basile Morlighem, Mathieu Seroussi, Helene Rignot, Eric van den Broeke, Michiel R. Kuipers Munneke, Peter Mouginot, Jeremie Smeets, Paul C.J.P. Tedstone, Andrew J. 2016-10-01 application/pdf https://hdl.handle.net/1983/dd8f867d-3eb4-49a9-a156-848a0729f012 https://research-information.bris.ac.uk/en/publications/dd8f867d-3eb4-49a9-a156-848a0729f012 https://doi.org/10.1002/2016JF003842 https://research-information.bris.ac.uk/ws/files/139513830/Full_text_PDF_final_published_version_.pdf http://www.scopus.com/inward/record.url?scp=84991461433&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess de Fleurian , B , Morlighem , M , Seroussi , H , Rignot , E , van den Broeke , M R , Kuipers Munneke , P , Mouginot , J , Smeets , P C J P & Tedstone , A J 2016 , ' A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland ' , Journal of Geophysical Research: Earth Surface , vol. 121 , no. 10 , pp. 1834-1848 . https://doi.org/10.1002/2016JF003842 glacier dynamics ice sheet modeling modeling subglacial hydrology article 2016 ftubristolcris https://doi.org/10.1002/2016JF003842 2024-01-04T23:54:02Z Basal sliding is a main control on glacier flow primarily driven by water pressure at the glacier base. The ongoing increase in surface melting of the Greenland Ice Sheet warrants an examination of its impact on basal water pressure and in turn on basal sliding. Here we examine the case of Russell Glacier, in West Greenland, where an extensive set of observations has been collected. These observations suggest that the recent increase in melt has had an equivocal impact on the annual velocity, with stable flow on the lower part of the drainage basin but accelerated flow above the Equilibrium Line Altitude (ELA). These distinct behaviors have been attributed to different evolutions of the subglacial draining system during and after the melt season. Here we use a high-resolution subglacial hydrological model forced by reconstructed surface runoff for the period 2008 to 2012 to investigate the cause of these distinct behaviors. We find that the increase in meltwater production at low elevation yields a more efficient drainage system compatible with the observed stagnation of the mean annual flow below the ELA. At higher elevation, the model indicates that the drainage system is mostly inefficient and is therefore strongly sensitive to an increase in meltwater availability, which is consistent with the observed increase in ice velocity. Article in Journal/Newspaper glacier Greenland Ice Sheet University of Bristol: Bristol Research Ela ENVELOPE(9.642,9.642,63.170,63.170) Greenland Journal of Geophysical Research: Earth Surface 121 10 1834 1848 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
glacier dynamics ice sheet modeling modeling subglacial hydrology |
spellingShingle |
glacier dynamics ice sheet modeling modeling subglacial hydrology de Fleurian, Basile Morlighem, Mathieu Seroussi, Helene Rignot, Eric van den Broeke, Michiel R. Kuipers Munneke, Peter Mouginot, Jeremie Smeets, Paul C.J.P. Tedstone, Andrew J. A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland |
topic_facet |
glacier dynamics ice sheet modeling modeling subglacial hydrology |
description |
Basal sliding is a main control on glacier flow primarily driven by water pressure at the glacier base. The ongoing increase in surface melting of the Greenland Ice Sheet warrants an examination of its impact on basal water pressure and in turn on basal sliding. Here we examine the case of Russell Glacier, in West Greenland, where an extensive set of observations has been collected. These observations suggest that the recent increase in melt has had an equivocal impact on the annual velocity, with stable flow on the lower part of the drainage basin but accelerated flow above the Equilibrium Line Altitude (ELA). These distinct behaviors have been attributed to different evolutions of the subglacial draining system during and after the melt season. Here we use a high-resolution subglacial hydrological model forced by reconstructed surface runoff for the period 2008 to 2012 to investigate the cause of these distinct behaviors. We find that the increase in meltwater production at low elevation yields a more efficient drainage system compatible with the observed stagnation of the mean annual flow below the ELA. At higher elevation, the model indicates that the drainage system is mostly inefficient and is therefore strongly sensitive to an increase in meltwater availability, which is consistent with the observed increase in ice velocity. |
format |
Article in Journal/Newspaper |
author |
de Fleurian, Basile Morlighem, Mathieu Seroussi, Helene Rignot, Eric van den Broeke, Michiel R. Kuipers Munneke, Peter Mouginot, Jeremie Smeets, Paul C.J.P. Tedstone, Andrew J. |
author_facet |
de Fleurian, Basile Morlighem, Mathieu Seroussi, Helene Rignot, Eric van den Broeke, Michiel R. Kuipers Munneke, Peter Mouginot, Jeremie Smeets, Paul C.J.P. Tedstone, Andrew J. |
author_sort |
de Fleurian, Basile |
title |
A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland |
title_short |
A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland |
title_full |
A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland |
title_fullStr |
A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland |
title_full_unstemmed |
A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland |
title_sort |
modeling study of the effect of runoff variability on the effective pressure beneath russell glacier, west greenland |
publishDate |
2016 |
url |
https://hdl.handle.net/1983/dd8f867d-3eb4-49a9-a156-848a0729f012 https://research-information.bris.ac.uk/en/publications/dd8f867d-3eb4-49a9-a156-848a0729f012 https://doi.org/10.1002/2016JF003842 https://research-information.bris.ac.uk/ws/files/139513830/Full_text_PDF_final_published_version_.pdf http://www.scopus.com/inward/record.url?scp=84991461433&partnerID=8YFLogxK |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) |
geographic |
Ela Greenland |
geographic_facet |
Ela Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
de Fleurian , B , Morlighem , M , Seroussi , H , Rignot , E , van den Broeke , M R , Kuipers Munneke , P , Mouginot , J , Smeets , P C J P & Tedstone , A J 2016 , ' A modeling study of the effect of runoff variability on the effective pressure beneath Russell Glacier, West Greenland ' , Journal of Geophysical Research: Earth Surface , vol. 121 , no. 10 , pp. 1834-1848 . https://doi.org/10.1002/2016JF003842 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016JF003842 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
121 |
container_issue |
10 |
container_start_page |
1834 |
op_container_end_page |
1848 |
_version_ |
1789332450520858624 |