Channelization of plumes beneath ice shelves
We study a simpli ed model of ice-ocean interaction beneath a oating ice shelf, and investigate the possibility for channels to form in the ice shelf base due to spatial variations in conditions at the grounding line. The model combines an extensional thin- film description of viscous ice flow in th...
Published in: | Journal of Fluid Mechanics |
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Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
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Cambridge University Press
2016
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Online Access: | https://doi.org/10.1017/jfm.2015.609 https://ora.ox.ac.uk/objects/uuid:1035f51e-be9c-4392-8af0-857293f45e63 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:1035f51e-be9c-4392-8af0-857293f45e63 2024-10-06T13:49:38+00:00 Channelization of plumes beneath ice shelves Wells, A Hewitt, I Dallaston, M 2016-07-28 https://doi.org/10.1017/jfm.2015.609 https://ora.ox.ac.uk/objects/uuid:1035f51e-be9c-4392-8af0-857293f45e63 unknown Cambridge University Press doi:10.1017/jfm.2015.609 https://ora.ox.ac.uk/objects/uuid:1035f51e-be9c-4392-8af0-857293f45e63 https://doi.org/10.1017/jfm.2015.609 info:eu-repo/semantics/openAccess Journal article 2016 ftuloxford https://doi.org/10.1017/jfm.2015.609 2024-09-06T07:47:27Z We study a simpli ed model of ice-ocean interaction beneath a oating ice shelf, and investigate the possibility for channels to form in the ice shelf base due to spatial variations in conditions at the grounding line. The model combines an extensional thin- film description of viscous ice flow in the shelf, with melting at its base driven by a turbulent ocean plume. Small transverse perturbations to the one-dimensional steady state are considered, driven either by ice thickness or subglacial discharge variations across the grounding line. Either forcing leads to the growth of channels downstream, with melting driven by locally enhanced ocean velocities, and thus heat transfer. Narrow channels are smoothed out due to turbulent mixing in the ocean plume, leading to a preferred wavelength for channel growth. In the absence of perturbations at the grounding line, linear stability analysis suggests that the one dimensional state is stable to initial perturbations, chiefly due to the background ice advection. Article in Journal/Newspaper Ice Shelf Ice Shelves ORA - Oxford University Research Archive Journal of Fluid Mechanics 785 109 134 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
description |
We study a simpli ed model of ice-ocean interaction beneath a oating ice shelf, and investigate the possibility for channels to form in the ice shelf base due to spatial variations in conditions at the grounding line. The model combines an extensional thin- film description of viscous ice flow in the shelf, with melting at its base driven by a turbulent ocean plume. Small transverse perturbations to the one-dimensional steady state are considered, driven either by ice thickness or subglacial discharge variations across the grounding line. Either forcing leads to the growth of channels downstream, with melting driven by locally enhanced ocean velocities, and thus heat transfer. Narrow channels are smoothed out due to turbulent mixing in the ocean plume, leading to a preferred wavelength for channel growth. In the absence of perturbations at the grounding line, linear stability analysis suggests that the one dimensional state is stable to initial perturbations, chiefly due to the background ice advection. |
format |
Article in Journal/Newspaper |
author |
Wells, A Hewitt, I Dallaston, M |
spellingShingle |
Wells, A Hewitt, I Dallaston, M Channelization of plumes beneath ice shelves |
author_facet |
Wells, A Hewitt, I Dallaston, M |
author_sort |
Wells, A |
title |
Channelization of plumes beneath ice shelves |
title_short |
Channelization of plumes beneath ice shelves |
title_full |
Channelization of plumes beneath ice shelves |
title_fullStr |
Channelization of plumes beneath ice shelves |
title_full_unstemmed |
Channelization of plumes beneath ice shelves |
title_sort |
channelization of plumes beneath ice shelves |
publisher |
Cambridge University Press |
publishDate |
2016 |
url |
https://doi.org/10.1017/jfm.2015.609 https://ora.ox.ac.uk/objects/uuid:1035f51e-be9c-4392-8af0-857293f45e63 |
genre |
Ice Shelf Ice Shelves |
genre_facet |
Ice Shelf Ice Shelves |
op_relation |
doi:10.1017/jfm.2015.609 https://ora.ox.ac.uk/objects/uuid:1035f51e-be9c-4392-8af0-857293f45e63 https://doi.org/10.1017/jfm.2015.609 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jfm.2015.609 |
container_title |
Journal of Fluid Mechanics |
container_volume |
785 |
container_start_page |
109 |
op_container_end_page |
134 |
_version_ |
1812177694509498368 |