Channelization of plumes beneath ice shelves
We study a simplified model of ice–ocean interaction beneath a floating 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...
Published in: | Journal of Fluid Mechanics |
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Language: | English |
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Cambridge University Press (CUP)
2015
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Online Access: | http://dx.doi.org/10.1017/jfm.2015.609 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022112015006096 |
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crcambridgeupr:10.1017/jfm.2015.609 2024-06-16T07:40:48+00:00 Channelization of plumes beneath ice shelves Dallaston, M. C. Hewitt, I. J. Wells, A. J. 2015 http://dx.doi.org/10.1017/jfm.2015.609 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022112015006096 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Fluid Mechanics volume 785, page 109-134 ISSN 0022-1120 1469-7645 journal-article 2015 crcambridgeupr https://doi.org/10.1017/jfm.2015.609 2024-05-22T12:55:18Z We study a simplified model of ice–ocean interaction beneath a floating 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 Cambridge University Press Journal of Fluid Mechanics 785 109 134 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
We study a simplified model of ice–ocean interaction beneath a floating 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 |
Dallaston, M. C. Hewitt, I. J. Wells, A. J. |
spellingShingle |
Dallaston, M. C. Hewitt, I. J. Wells, A. J. Channelization of plumes beneath ice shelves |
author_facet |
Dallaston, M. C. Hewitt, I. J. Wells, A. J. |
author_sort |
Dallaston, M. C. |
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 (CUP) |
publishDate |
2015 |
url |
http://dx.doi.org/10.1017/jfm.2015.609 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022112015006096 |
genre |
Ice Shelf Ice Shelves |
genre_facet |
Ice Shelf Ice Shelves |
op_source |
Journal of Fluid Mechanics volume 785, page 109-134 ISSN 0022-1120 1469-7645 |
op_rights |
https://www.cambridge.org/core/terms |
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_ |
1802007801301565440 |