Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams
Currently, several large-scale ice-flow models impose a condition on ice flux across grounding lines using an analytically motivated parameterisation of grounding-line flux. It has been suggested that employing this analytical expression alleviates the need for highly resolved computational domains...
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/36202/ https://doi.org/10.5194/tc-12-3229-2018 https://nrl.northumbria.ac.uk/id/eprint/36202/1/Reese%20et%20al%20-%20Grounding-line%20flux%20formula%20applied%20as%20a%20flux%20condition%20in%20numerical%20simulations%20fails%20for%20buttressed%20Antarctic%20ice%20streams%20OA.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:36202 2023-05-15T13:56:54+02:00 Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams Reese, Ronja Winkelmann, Ricarda Gudmundsson, Hilmar 2018-10-09 text https://nrl.northumbria.ac.uk/id/eprint/36202/ https://doi.org/10.5194/tc-12-3229-2018 https://nrl.northumbria.ac.uk/id/eprint/36202/1/Reese%20et%20al%20-%20Grounding-line%20flux%20formula%20applied%20as%20a%20flux%20condition%20in%20numerical%20simulations%20fails%20for%20buttressed%20Antarctic%20ice%20streams%20OA.pdf en eng Coperincus https://nrl.northumbria.ac.uk/id/eprint/36202/1/Reese%20et%20al%20-%20Grounding-line%20flux%20formula%20applied%20as%20a%20flux%20condition%20in%20numerical%20simulations%20fails%20for%20buttressed%20Antarctic%20ice%20streams%20OA.pdf Reese, Ronja, Winkelmann, Ricarda and Gudmundsson, Hilmar (2018) Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams. The Cryosphere, 12 (10). pp. 3229-3242. ISSN 1994-0424 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2018 ftunivnorthumb https://doi.org/10.5194/tc-12-3229-2018 2022-09-25T06:08:17Z Currently, several large-scale ice-flow models impose a condition on ice flux across grounding lines using an analytically motivated parameterisation of grounding-line flux. It has been suggested that employing this analytical expression alleviates the need for highly resolved computational domains around grounding lines of marine ice sheets. While the analytical flux formula is expected to be accurate in an unbuttressed flow-line setting, its validity has hitherto not been assessed for complex and realistic geometries such as those of the Antarctic Ice Sheet. Here the accuracy of this analytical flux formula is tested against an optimised ice flow model that uses a highly resolved computational mesh around the Antarctic grounding lines. We find that when applied to the Antarctic Ice Sheet the analytical expression provides inaccurate estimates of ice fluxes for almost all grounding lines. Furthermore, in many instances direct application of the analytical formula gives rise to unphysical complex-valued ice fluxes. We conclude that grounding lines of the Antarctic Ice Sheet are, in general, too highly buttressed for the analytical parameterisation to be of practical value for the calculation of grounding-line fluxes. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet The Cryosphere Northumbria University, Newcastle: Northumbria Research Link (NRL) Antarctic The Antarctic The Cryosphere 12 10 3229 3242 |
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 Reese, Ronja Winkelmann, Ricarda Gudmundsson, Hilmar Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Currently, several large-scale ice-flow models impose a condition on ice flux across grounding lines using an analytically motivated parameterisation of grounding-line flux. It has been suggested that employing this analytical expression alleviates the need for highly resolved computational domains around grounding lines of marine ice sheets. While the analytical flux formula is expected to be accurate in an unbuttressed flow-line setting, its validity has hitherto not been assessed for complex and realistic geometries such as those of the Antarctic Ice Sheet. Here the accuracy of this analytical flux formula is tested against an optimised ice flow model that uses a highly resolved computational mesh around the Antarctic grounding lines. We find that when applied to the Antarctic Ice Sheet the analytical expression provides inaccurate estimates of ice fluxes for almost all grounding lines. Furthermore, in many instances direct application of the analytical formula gives rise to unphysical complex-valued ice fluxes. We conclude that grounding lines of the Antarctic Ice Sheet are, in general, too highly buttressed for the analytical parameterisation to be of practical value for the calculation of grounding-line fluxes. |
format |
Article in Journal/Newspaper |
author |
Reese, Ronja Winkelmann, Ricarda Gudmundsson, Hilmar |
author_facet |
Reese, Ronja Winkelmann, Ricarda Gudmundsson, Hilmar |
author_sort |
Reese, Ronja |
title |
Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
title_short |
Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
title_full |
Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
title_fullStr |
Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
title_full_unstemmed |
Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
title_sort |
grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed antarctic ice streams |
publisher |
Coperincus |
publishDate |
2018 |
url |
https://nrl.northumbria.ac.uk/id/eprint/36202/ https://doi.org/10.5194/tc-12-3229-2018 https://nrl.northumbria.ac.uk/id/eprint/36202/1/Reese%20et%20al%20-%20Grounding-line%20flux%20formula%20applied%20as%20a%20flux%20condition%20in%20numerical%20simulations%20fails%20for%20buttressed%20Antarctic%20ice%20streams%20OA.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet The Cryosphere |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/36202/1/Reese%20et%20al%20-%20Grounding-line%20flux%20formula%20applied%20as%20a%20flux%20condition%20in%20numerical%20simulations%20fails%20for%20buttressed%20Antarctic%20ice%20streams%20OA.pdf Reese, Ronja, Winkelmann, Ricarda and Gudmundsson, Hilmar (2018) Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams. The Cryosphere, 12 (10). pp. 3229-3242. ISSN 1994-0424 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-12-3229-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
10 |
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3229 |
op_container_end_page |
3242 |
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1766264499637059584 |