Ice-shelf buttressing and the stability of marine ice sheets
Ice-shelf buttressing and the stability of marinetype 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 un...
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Language: | English |
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2013
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/34964/ https://doi.org/10.5194/tc-7-647-2013 https://nrl.northumbria.ac.uk/id/eprint/34964/1/Gudmundsson%20-%20Ice-shelf%20buttressing%20and%20the%20stability%20of%20marine%20ice%20sheets%20OA.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:34964 2023-05-15T16:41:47+02:00 Ice-shelf buttressing and the stability of marine ice sheets Gudmundsson, Hilmar 2013-04-04 text https://nrl.northumbria.ac.uk/id/eprint/34964/ https://doi.org/10.5194/tc-7-647-2013 https://nrl.northumbria.ac.uk/id/eprint/34964/1/Gudmundsson%20-%20Ice-shelf%20buttressing%20and%20the%20stability%20of%20marine%20ice%20sheets%20OA.pdf en eng Coperincus https://nrl.northumbria.ac.uk/id/eprint/34964/1/Gudmundsson%20-%20Ice-shelf%20buttressing%20and%20the%20stability%20of%20marine%20ice%20sheets%20OA.pdf Gudmundsson, Hilmar (2013) Ice-shelf buttressing and the stability of marine ice sheets. The Cryosphere, 7 (2). pp. 647-655. ISSN 1994-0424 cc_by CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2013 ftunivnorthumb https://doi.org/10.5194/tc-7-647-2013 2022-09-25T06:07:38Z Ice-shelf buttressing and the stability of marinetype 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 Northumbria University, Newcastle: Northumbria Research Link (NRL) The Cryosphere 7 2 647 655 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Gudmundsson, Hilmar Ice-shelf buttressing and the stability of marine ice sheets |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Ice-shelf buttressing and the stability of marinetype 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, Hilmar |
author_facet |
Gudmundsson, Hilmar |
author_sort |
Gudmundsson, Hilmar |
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 |
Coperincus |
publishDate |
2013 |
url |
https://nrl.northumbria.ac.uk/id/eprint/34964/ https://doi.org/10.5194/tc-7-647-2013 https://nrl.northumbria.ac.uk/id/eprint/34964/1/Gudmundsson%20-%20Ice-shelf%20buttressing%20and%20the%20stability%20of%20marine%20ice%20sheets%20OA.pdf |
genre |
Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf The Cryosphere |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/34964/1/Gudmundsson%20-%20Ice-shelf%20buttressing%20and%20the%20stability%20of%20marine%20ice%20sheets%20OA.pdf Gudmundsson, Hilmar (2013) Ice-shelf buttressing and the stability of marine ice sheets. The Cryosphere, 7 (2). pp. 647-655. ISSN 1994-0424 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
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_ |
1766032247881728000 |