Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems
We use a combination of field observations and hydrological modelling to examine the mechanisms through which variability in melt water input affects ice motion at a land terminating Greenlandic outlet glacier. We find a close agreement between horizontal ice velocity, vertical ice velocity and mode...
Published in: | Journal of Glaciology |
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Language: | English |
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2016
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/variability-in-ice-motion-at-a-landterminating-greenlandic-outlet-glacier-the-role-of-channelized-and-distributed-drainage-systems(7f6897d1-bc1c-488b-ab1f-d71a188275c4).html https://doi.org/10.1017/jog.2016.36 https://research-repository.st-andrews.ac.uk/bitstream/10023/9484/1/Cowton_2016_JG_GreenlandicOutletGlacier_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/7f6897d1-bc1c-488b-ab1f-d71a188275c4 2024-06-23T07:53:26+00:00 Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems Cowton, Tom Nienow, Peter Sole, Andrew Bartholomew, Ian Mair, Douglas 2016-06-01 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/variability-in-ice-motion-at-a-landterminating-greenlandic-outlet-glacier-the-role-of-channelized-and-distributed-drainage-systems(7f6897d1-bc1c-488b-ab1f-d71a188275c4).html https://doi.org/10.1017/jog.2016.36 https://research-repository.st-andrews.ac.uk/bitstream/10023/9484/1/Cowton_2016_JG_GreenlandicOutletGlacier_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/variability-in-ice-motion-at-a-landterminating-greenlandic-outlet-glacier-the-role-of-channelized-and-distributed-drainage-systems(7f6897d1-bc1c-488b-ab1f-d71a188275c4).html info:eu-repo/semantics/openAccess Cowton , T , Nienow , P , Sole , A , Bartholomew , I & Mair , D 2016 , ' Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems ' , Journal of Glaciology , vol. 62 , no. 233 , pp. 451-466 . https://doi.org/10.1017/jog.2016.36 Glacier hydrology Ice dynamics Subglacial processes article 2016 ftunstandrewcris https://doi.org/10.1017/jog.2016.36 2024-06-13T00:52:56Z We use a combination of field observations and hydrological modelling to examine the mechanisms through which variability in melt water input affects ice motion at a land terminating Greenlandic outlet glacier. We find a close agreement between horizontal ice velocity, vertical ice velocity and modelled subglacial water pressure over the course of a melt season. On this basis, we argue that variation in horizontal and vertical ice velocity primarily reflects the displacement of basal ice during periods of cavity expansion and contraction, a process itself driven by fluctuations in basal water pressure originating in subglacial channels. This process is not captured by traditional sliding laws linking water pressure and basal velocity, which may hinder the simulation of realistic diurnal to seasonal variability in ice velocity in coupled models of glacial hydrology and dynamics. Article in Journal/Newspaper greenlandic Journal of Glaciology University of St Andrews: Research Portal Journal of Glaciology 62 233 451 466 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Glacier hydrology Ice dynamics Subglacial processes |
spellingShingle |
Glacier hydrology Ice dynamics Subglacial processes Cowton, Tom Nienow, Peter Sole, Andrew Bartholomew, Ian Mair, Douglas Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems |
topic_facet |
Glacier hydrology Ice dynamics Subglacial processes |
description |
We use a combination of field observations and hydrological modelling to examine the mechanisms through which variability in melt water input affects ice motion at a land terminating Greenlandic outlet glacier. We find a close agreement between horizontal ice velocity, vertical ice velocity and modelled subglacial water pressure over the course of a melt season. On this basis, we argue that variation in horizontal and vertical ice velocity primarily reflects the displacement of basal ice during periods of cavity expansion and contraction, a process itself driven by fluctuations in basal water pressure originating in subglacial channels. This process is not captured by traditional sliding laws linking water pressure and basal velocity, which may hinder the simulation of realistic diurnal to seasonal variability in ice velocity in coupled models of glacial hydrology and dynamics. |
format |
Article in Journal/Newspaper |
author |
Cowton, Tom Nienow, Peter Sole, Andrew Bartholomew, Ian Mair, Douglas |
author_facet |
Cowton, Tom Nienow, Peter Sole, Andrew Bartholomew, Ian Mair, Douglas |
author_sort |
Cowton, Tom |
title |
Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems |
title_short |
Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems |
title_full |
Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems |
title_fullStr |
Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems |
title_full_unstemmed |
Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems |
title_sort |
variability in ice motion at a land-terminating greenlandic outlet glacier: the role of channelized and distributed drainage systems |
publishDate |
2016 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/variability-in-ice-motion-at-a-landterminating-greenlandic-outlet-glacier-the-role-of-channelized-and-distributed-drainage-systems(7f6897d1-bc1c-488b-ab1f-d71a188275c4).html https://doi.org/10.1017/jog.2016.36 https://research-repository.st-andrews.ac.uk/bitstream/10023/9484/1/Cowton_2016_JG_GreenlandicOutletGlacier_CC.pdf |
genre |
greenlandic Journal of Glaciology |
genre_facet |
greenlandic Journal of Glaciology |
op_source |
Cowton , T , Nienow , P , Sole , A , Bartholomew , I & Mair , D 2016 , ' Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems ' , Journal of Glaciology , vol. 62 , no. 233 , pp. 451-466 . https://doi.org/10.1017/jog.2016.36 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/variability-in-ice-motion-at-a-landterminating-greenlandic-outlet-glacier-the-role-of-channelized-and-distributed-drainage-systems(7f6897d1-bc1c-488b-ab1f-d71a188275c4).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2016.36 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
233 |
container_start_page |
451 |
op_container_end_page |
466 |
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1802645070002782208 |