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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ftdoajarticles:oai:doaj.org/article:de4e977d05454018aecfe06e896bcf79 2023-05-15T13:51:23+02:00 Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams R. Reese R. Winkelmann G. H. Gudmundsson 2018-10-01T00:00:00Z https://doi.org/10.5194/tc-12-3229-2018 https://doaj.org/article/de4e977d05454018aecfe06e896bcf79 EN eng Copernicus Publications https://www.the-cryosphere.net/12/3229/2018/tc-12-3229-2018.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-12-3229-2018 1994-0416 1994-0424 https://doaj.org/article/de4e977d05454018aecfe06e896bcf79 The Cryosphere, Vol 12, Pp 3229-3242 (2018) Environmental sciences GE1-350 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/tc-12-3229-2018 2022-12-31T13:20:15Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic The Cryosphere 12 10 3229 3242 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 R. Reese R. Winkelmann G. H. Gudmundsson Grounding-line flux formula applied as a flux condition in numerical simulations fails for buttressed Antarctic ice streams |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
R. Reese R. Winkelmann G. H. Gudmundsson |
author_facet |
R. Reese R. Winkelmann G. H. Gudmundsson |
author_sort |
R. Reese |
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 |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-3229-2018 https://doaj.org/article/de4e977d05454018aecfe06e896bcf79 |
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, Vol 12, Pp 3229-3242 (2018) |
op_relation |
https://www.the-cryosphere.net/12/3229/2018/tc-12-3229-2018.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-12-3229-2018 1994-0416 1994-0424 https://doaj.org/article/de4e977d05454018aecfe06e896bcf79 |
op_doi |
https://doi.org/10.5194/tc-12-3229-2018 |
container_title |
The Cryosphere |
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12 |
container_issue |
10 |
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3229 |
op_container_end_page |
3242 |
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1766255228991045632 |