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...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2013
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00023050 2023-05-15T16:41:47+02:00 Ice-shelf buttressing and the stability of marine ice sheets Gudmundsson, G. H. 2013-04 electronic https://doi.org/10.5194/tc-7-647-2013 https://noa.gwlb.de/receive/cop_mods_00023050 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023005/tc-7-647-2013.pdf https://tc.copernicus.org/articles/7/647/2013/tc-7-647-2013.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-7-647-2013 https://noa.gwlb.de/receive/cop_mods_00023050 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023005/tc-7-647-2013.pdf https://tc.copernicus.org/articles/7/647/2013/tc-7-647-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/tc-7-647-2013 2022-02-08T22:50:50Z 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 Niedersächsisches Online-Archiv NOA The Cryosphere 7 2 647 655 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Gudmundsson, G. H. Ice-shelf buttressing and the stability of marine ice sheets |
topic_facet |
article Verlagsveröffentlichung |
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 |
Gudmundsson, G. H. |
author_facet |
Gudmundsson, G. H. |
author_sort |
Gudmundsson, G. H. |
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 https://noa.gwlb.de/receive/cop_mods_00023050 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023005/tc-7-647-2013.pdf https://tc.copernicus.org/articles/7/647/2013/tc-7-647-2013.pdf |
genre |
Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-7-647-2013 https://noa.gwlb.de/receive/cop_mods_00023050 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023005/tc-7-647-2013.pdf https://tc.copernicus.org/articles/7/647/2013/tc-7-647-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
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_ |
1766032247230562304 |