Ice-shelf buttressing and the stability of marine ice sheets
Ice-shelf buttressing and the stability of marine-type ice sheets are investigated numerically. Buttressing effects are analysed for a situation where a stable grounding line is located on a bed sloping upwards in the direction of flow. Such grounding-line positions are known to be unconditionally u...
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Language: | English |
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Copernicus Publications
2013
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Online Access: | https://doi.org/10.5194/tc-7-647-2013 http://www.the-cryosphere.net/7/647/2013/tc-7-647-2013.pdf https://doaj.org/article/bcc707249fc64bdaa0c21a975af99286 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:bcc707249fc64bdaa0c21a975af99286 2023-05-15T16:41:47+02:00 Ice-shelf buttressing and the stability of marine ice sheets G. H. Gudmundsson 2013-04-01 https://doi.org/10.5194/tc-7-647-2013 http://www.the-cryosphere.net/7/647/2013/tc-7-647-2013.pdf https://doaj.org/article/bcc707249fc64bdaa0c21a975af99286 en eng Copernicus Publications doi:10.5194/tc-7-647-2013 1994-0416 1994-0424 http://www.the-cryosphere.net/7/647/2013/tc-7-647-2013.pdf https://doaj.org/article/bcc707249fc64bdaa0c21a975af99286 undefined The Cryosphere, Vol 7, Iss 2, Pp 647-655 (2013) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/tc-7-647-2013 2023-01-22T17:53:09Z Ice-shelf buttressing and the stability of marine-type ice sheets are investigated numerically. Buttressing effects are analysed for a situation where a stable grounding line is located on a bed sloping upwards in the direction of flow. Such grounding-line positions are known to be unconditionally unstable in the absence of transverse flow variations. It is shown that ice-shelf buttressing can restore stability under these conditions. Ice flux at the grounding line is, in general, not a monotonically increasing function of ice thickness. This, possibly at first somewhat counterintuitive result, is found to be fully consistent with recent theoretical work. Grounding lines on retrograde slopes are conditionally stable, and the stability regime is a non-trivial function of bed and ice-shelf geometry. The stability of grounding lines cannot be assessed from considerations of local bed slope only. Article in Journal/Newspaper Ice Shelf The Cryosphere Unknown The Cryosphere 7 2 647 655 |
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English |
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envir geo |
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envir geo G. H. Gudmundsson Ice-shelf buttressing and the stability of marine ice sheets |
topic_facet |
envir geo |
description |
Ice-shelf buttressing and the stability of marine-type ice sheets are investigated numerically. Buttressing effects are analysed for a situation where a stable grounding line is located on a bed sloping upwards in the direction of flow. Such grounding-line positions are known to be unconditionally unstable in the absence of transverse flow variations. It is shown that ice-shelf buttressing can restore stability under these conditions. Ice flux at the grounding line is, in general, not a monotonically increasing function of ice thickness. This, possibly at first somewhat counterintuitive result, is found to be fully consistent with recent theoretical work. Grounding lines on retrograde slopes are conditionally stable, and the stability regime is a non-trivial function of bed and ice-shelf geometry. The stability of grounding lines cannot be assessed from considerations of local bed slope only. |
format |
Article in Journal/Newspaper |
author |
G. H. Gudmundsson |
author_facet |
G. H. Gudmundsson |
author_sort |
G. H. Gudmundsson |
title |
Ice-shelf buttressing and the stability of marine ice sheets |
title_short |
Ice-shelf buttressing and the stability of marine ice sheets |
title_full |
Ice-shelf buttressing and the stability of marine ice sheets |
title_fullStr |
Ice-shelf buttressing and the stability of marine ice sheets |
title_full_unstemmed |
Ice-shelf buttressing and the stability of marine ice sheets |
title_sort |
ice-shelf buttressing and the stability of marine ice sheets |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-647-2013 http://www.the-cryosphere.net/7/647/2013/tc-7-647-2013.pdf https://doaj.org/article/bcc707249fc64bdaa0c21a975af99286 |
genre |
Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 7, Iss 2, Pp 647-655 (2013) |
op_relation |
doi:10.5194/tc-7-647-2013 1994-0416 1994-0424 http://www.the-cryosphere.net/7/647/2013/tc-7-647-2013.pdf https://doaj.org/article/bcc707249fc64bdaa0c21a975af99286 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-7-647-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
2 |
container_start_page |
647 |
op_container_end_page |
655 |
_version_ |
1766032248074665984 |