Modelled fracture and calving on the Totten Ice Shelf
The Totten Ice Shelf (IS) has a large drainage basin, much of which is grounded below sea level, leaving the glacier vulnerable to retreat through the marine ice sheet instability mechanism. The ice shelf has also been shown to be sensitive to changes in calving rate, as a very small retreat of the...
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00005220 2023-05-15T16:41:18+02:00 Modelled fracture and calving on the Totten Ice Shelf Cook, Sue Åström, Jan Zwinger, Thomas Galton-Fenzi, Benjamin Keith Greenbaum, Jamin Stevens Coleman, Richard 2018-07 electronic https://doi.org/10.5194/tc-12-2401-2018 https://noa.gwlb.de/receive/cop_mods_00005220 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005177/tc-12-2401-2018.pdf https://tc.copernicus.org/articles/12/2401/2018/tc-12-2401-2018.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-12-2401-2018 https://noa.gwlb.de/receive/cop_mods_00005220 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005177/tc-12-2401-2018.pdf https://tc.copernicus.org/articles/12/2401/2018/tc-12-2401-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/tc-12-2401-2018 2022-02-08T22:59:42Z The Totten Ice Shelf (IS) has a large drainage basin, much of which is grounded below sea level, leaving the glacier vulnerable to retreat through the marine ice sheet instability mechanism. The ice shelf has also been shown to be sensitive to changes in calving rate, as a very small retreat of the calving front from its current position is predicted to cause a change in flow at the grounding line. Therefore understanding the processes behind calving on the Totten IS is key to predicting its future sea level rise contribution. Here we use the Helsinki Discrete Element Model (HiDEM) to show that not all of the fractures visible at the front of the Totten IS are produced locally, but that the across-flow basal crevasses, which are part of the distinctive cross-cutting fracture pattern, are advected into the calving front area from upstream. A separate simulation of the grounding line shows that re-grounding points may be key areas of basal crevasse production, and can produce basal crevasses in both an along- and across-flow orientation. The along-flow basal crevasses at the grounding line may be a possible precursor to basal channels, while we suggest the across-flow grounding-line fractures are the source of the across-flow features observed at the calving front. We use two additional models to simulate the evolution of basal fractures as they advect downstream, demonstrating that both strain and ocean melt have the potential to deform narrow fractures into the broad basal features observed near the calving front. The wide range of factors which influence fracture patterns and calving on this glacier will be a challenge for predicting its future mass loss. Article in Journal/Newspaper Ice Sheet Ice Shelf The Cryosphere Totten Ice Shelf Niedersächsisches Online-Archiv NOA The Cryosphere 12 7 2401 2411 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Cook, Sue Åström, Jan Zwinger, Thomas Galton-Fenzi, Benjamin Keith Greenbaum, Jamin Stevens Coleman, Richard Modelled fracture and calving on the Totten Ice Shelf |
topic_facet |
article Verlagsveröffentlichung |
description |
The Totten Ice Shelf (IS) has a large drainage basin, much of which is grounded below sea level, leaving the glacier vulnerable to retreat through the marine ice sheet instability mechanism. The ice shelf has also been shown to be sensitive to changes in calving rate, as a very small retreat of the calving front from its current position is predicted to cause a change in flow at the grounding line. Therefore understanding the processes behind calving on the Totten IS is key to predicting its future sea level rise contribution. Here we use the Helsinki Discrete Element Model (HiDEM) to show that not all of the fractures visible at the front of the Totten IS are produced locally, but that the across-flow basal crevasses, which are part of the distinctive cross-cutting fracture pattern, are advected into the calving front area from upstream. A separate simulation of the grounding line shows that re-grounding points may be key areas of basal crevasse production, and can produce basal crevasses in both an along- and across-flow orientation. The along-flow basal crevasses at the grounding line may be a possible precursor to basal channels, while we suggest the across-flow grounding-line fractures are the source of the across-flow features observed at the calving front. We use two additional models to simulate the evolution of basal fractures as they advect downstream, demonstrating that both strain and ocean melt have the potential to deform narrow fractures into the broad basal features observed near the calving front. The wide range of factors which influence fracture patterns and calving on this glacier will be a challenge for predicting its future mass loss. |
format |
Article in Journal/Newspaper |
author |
Cook, Sue Åström, Jan Zwinger, Thomas Galton-Fenzi, Benjamin Keith Greenbaum, Jamin Stevens Coleman, Richard |
author_facet |
Cook, Sue Åström, Jan Zwinger, Thomas Galton-Fenzi, Benjamin Keith Greenbaum, Jamin Stevens Coleman, Richard |
author_sort |
Cook, Sue |
title |
Modelled fracture and calving on the Totten Ice Shelf |
title_short |
Modelled fracture and calving on the Totten Ice Shelf |
title_full |
Modelled fracture and calving on the Totten Ice Shelf |
title_fullStr |
Modelled fracture and calving on the Totten Ice Shelf |
title_full_unstemmed |
Modelled fracture and calving on the Totten Ice Shelf |
title_sort |
modelled fracture and calving on the totten ice shelf |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-2401-2018 https://noa.gwlb.de/receive/cop_mods_00005220 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005177/tc-12-2401-2018.pdf https://tc.copernicus.org/articles/12/2401/2018/tc-12-2401-2018.pdf |
genre |
Ice Sheet Ice Shelf The Cryosphere Totten Ice Shelf |
genre_facet |
Ice Sheet Ice Shelf The Cryosphere Totten Ice Shelf |
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-12-2401-2018 https://noa.gwlb.de/receive/cop_mods_00005220 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005177/tc-12-2401-2018.pdf https://tc.copernicus.org/articles/12/2401/2018/tc-12-2401-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-12-2401-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
7 |
container_start_page |
2401 |
op_container_end_page |
2411 |
_version_ |
1766031731985481728 |