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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ftleibnizopen:oai:oai.leibnizopen.de:BXbgXIkBdbrxVwz6Hxif 2023-07-30T03:58:09+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, G. Hilmar 2018 application/pdf https://oa.tib.eu/renate/handle/123456789/11316 https://doi.org/10.34657/10351 eng eng Katlenburg-Lindau : Copernicus CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ The Cryosphere : TC 12 (2018), Nr. 10 sea-level rise sheet models shelf flow resolution dynamics mismip sensitivity stability discharge 910 550 article Text 2018 ftleibnizopen https://doi.org/10.34657/10351 2023-07-16T23:09:40Z 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. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Ice Sheet The Cryosphere LeibnizOpen (The Leibniz Association) Antarctic The Antarctic |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
sea-level rise sheet models shelf flow resolution dynamics mismip sensitivity stability discharge 910 550 |
spellingShingle |
sea-level rise sheet models shelf flow resolution dynamics mismip sensitivity stability discharge 910 550 Reese, Ronja Winkelmann, Ricarda Gudmundsson, G. Hilmar Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
topic_facet |
sea-level rise sheet models shelf flow resolution dynamics mismip sensitivity stability discharge 910 550 |
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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Reese, Ronja Winkelmann, Ricarda Gudmundsson, G. Hilmar |
author_facet |
Reese, Ronja Winkelmann, Ricarda Gudmundsson, G. 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 |
Katlenburg-Lindau : Copernicus |
publishDate |
2018 |
url |
https://oa.tib.eu/renate/handle/123456789/11316 https://doi.org/10.34657/10351 |
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_source |
The Cryosphere : TC 12 (2018), Nr. 10 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/10351 |
_version_ |
1772821035535564800 |