Simulated dynamic regrounding during marine ice sheet retreat
Marine-terminating ice sheets are of interest due to their potential instability, making them vulnerable to rapid retreat. Modelling the evolution of glaciers and ice streams in such regions is key to understanding their possible contribution to sea level rise. The friction caused by the sliding of...
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Online Access: | https://doi.org/10.5194/tc-12-2425-2018 http://ecite.utas.edu.au/127396 |
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ftunivtasecite:oai:ecite.utas.edu.au:127396 2023-05-15T16:40:31+02:00 Simulated dynamic regrounding during marine ice sheet retreat Jong, LM Gladstone, RM Galton-Fenzi, BK King, MA 2018 application/pdf https://doi.org/10.5194/tc-12-2425-2018 http://ecite.utas.edu.au/127396 en eng Copernicus GmbH http://ecite.utas.edu.au/127396/2/127396 - Simulated dynamic regrounding during marine ice sheet retreat.pdf http://dx.doi.org/10.5194/tc-12-2425-2018 Jong, LM and Gladstone, RM and Galton-Fenzi, BK and King, MA, Simulated dynamic regrounding during marine ice sheet retreat, The Cryosphere, 12, (7) pp. 2425-2436. ISSN 1994-0416 (2018) [Refereed Article] http://ecite.utas.edu.au/127396 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2018 ftunivtasecite https://doi.org/10.5194/tc-12-2425-2018 2019-12-13T22:25:41Z Marine-terminating ice sheets are of interest due to their potential instability, making them vulnerable to rapid retreat. Modelling the evolution of glaciers and ice streams in such regions is key to understanding their possible contribution to sea level rise. The friction caused by the sliding of ice over bedrock and the resultant shear stress are important factors in determining the velocity of sliding ice. Many models use simple power-law expressions for the relationship between the basal shear stress and ice velocity or introduce an effective-pressure dependence into the sliding relation in an ad hoc manner. Sliding relations based on water filled subglacial cavities are more physically motivated, with the overburden pressure of the ice included. Here we show that using a cavitation-based sliding relation allows for the temporary regrounding of an ice shelf at a point downstream of the main grounding line of a marine ice sheet undergoing retreat across a retrograde bedrock slope. This suggests that the choice of sliding relation is especially important when modelling grounding line behaviour of regions where potential ice rises and pinning points are present and regrounding could occur. Article in Journal/Newspaper Ice Sheet Ice Shelf The Cryosphere eCite UTAS (University of Tasmania) The Cryosphere 12 7 2425 2436 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Jong, LM Gladstone, RM Galton-Fenzi, BK King, MA Simulated dynamic regrounding during marine ice sheet retreat |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
Marine-terminating ice sheets are of interest due to their potential instability, making them vulnerable to rapid retreat. Modelling the evolution of glaciers and ice streams in such regions is key to understanding their possible contribution to sea level rise. The friction caused by the sliding of ice over bedrock and the resultant shear stress are important factors in determining the velocity of sliding ice. Many models use simple power-law expressions for the relationship between the basal shear stress and ice velocity or introduce an effective-pressure dependence into the sliding relation in an ad hoc manner. Sliding relations based on water filled subglacial cavities are more physically motivated, with the overburden pressure of the ice included. Here we show that using a cavitation-based sliding relation allows for the temporary regrounding of an ice shelf at a point downstream of the main grounding line of a marine ice sheet undergoing retreat across a retrograde bedrock slope. This suggests that the choice of sliding relation is especially important when modelling grounding line behaviour of regions where potential ice rises and pinning points are present and regrounding could occur. |
format |
Article in Journal/Newspaper |
author |
Jong, LM Gladstone, RM Galton-Fenzi, BK King, MA |
author_facet |
Jong, LM Gladstone, RM Galton-Fenzi, BK King, MA |
author_sort |
Jong, LM |
title |
Simulated dynamic regrounding during marine ice sheet retreat |
title_short |
Simulated dynamic regrounding during marine ice sheet retreat |
title_full |
Simulated dynamic regrounding during marine ice sheet retreat |
title_fullStr |
Simulated dynamic regrounding during marine ice sheet retreat |
title_full_unstemmed |
Simulated dynamic regrounding during marine ice sheet retreat |
title_sort |
simulated dynamic regrounding during marine ice sheet retreat |
publisher |
Copernicus GmbH |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-2425-2018 http://ecite.utas.edu.au/127396 |
genre |
Ice Sheet Ice Shelf The Cryosphere |
genre_facet |
Ice Sheet Ice Shelf The Cryosphere |
op_relation |
http://ecite.utas.edu.au/127396/2/127396 - Simulated dynamic regrounding during marine ice sheet retreat.pdf http://dx.doi.org/10.5194/tc-12-2425-2018 Jong, LM and Gladstone, RM and Galton-Fenzi, BK and King, MA, Simulated dynamic regrounding during marine ice sheet retreat, The Cryosphere, 12, (7) pp. 2425-2436. ISSN 1994-0416 (2018) [Refereed Article] http://ecite.utas.edu.au/127396 |
op_doi |
https://doi.org/10.5194/tc-12-2425-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
7 |
container_start_page |
2425 |
op_container_end_page |
2436 |
_version_ |
1766030916341202944 |