Ice shelf fracture parameterization in an ice sheet model
Floating ice shelves exert a stabilizing force onto the inland ice sheet. However, this buttressing effect is diminished by the fracture process, which on large scales effectively softens the ice, accelerating its flow, increasing calving, and potentially leading to ice shelf breakup. We add a conti...
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Online Access: | https://doi.org/10.5194/tc-11-2543-2017 https://doaj.org/article/0ed874b3228849f3837e6246961843d9 |
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ftdoajarticles:oai:doaj.org/article:0ed874b3228849f3837e6246961843d9 2023-05-15T16:39:41+02:00 Ice shelf fracture parameterization in an ice sheet model S. Sun S. L. Cornford J. C. Moore R. Gladstone L. Zhao 2017-11-01T00:00:00Z https://doi.org/10.5194/tc-11-2543-2017 https://doaj.org/article/0ed874b3228849f3837e6246961843d9 EN eng Copernicus Publications https://www.the-cryosphere.net/11/2543/2017/tc-11-2543-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-2543-2017 1994-0416 1994-0424 https://doaj.org/article/0ed874b3228849f3837e6246961843d9 The Cryosphere, Vol 11, Pp 2543-2554 (2017) Environmental sciences GE1-350 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/tc-11-2543-2017 2022-12-31T01:42:49Z Floating ice shelves exert a stabilizing force onto the inland ice sheet. However, this buttressing effect is diminished by the fracture process, which on large scales effectively softens the ice, accelerating its flow, increasing calving, and potentially leading to ice shelf breakup. We add a continuum damage model (CDM) to the BISICLES ice sheet model, which is intended to model the localized opening of crevasses under stress, the transport of those crevasses through the ice sheet, and the coupling between crevasse depth and the ice flow field and to carry out idealized numerical experiments examining the broad impact on large-scale ice sheet and shelf dynamics. In each case we see a complex pattern of damage evolve over time, with an eventual loss of buttressing approximately equivalent to halving the thickness of the ice shelf. We find that it is possible to achieve a similar ice flow pattern using a simple rule of thumb: introducing an enhancement factor ∼ 10 everywhere in the model domain. However, spatially varying damage (or equivalently, enhancement factor) fields set at the start of prognostic calculations to match velocity observations, as is widely done in ice sheet simulations, ought to evolve in time, or grounding line retreat can be slowed by an order of magnitude. Article in Journal/Newspaper Ice Sheet Ice Shelf Ice Shelves The Cryosphere Directory of Open Access Journals: DOAJ Articles Thumb ENVELOPE(-64.259,-64.259,-65.247,-65.247) The Cryosphere 11 6 2543 2554 |
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 S. Sun S. L. Cornford J. C. Moore R. Gladstone L. Zhao Ice shelf fracture parameterization in an ice sheet model |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Floating ice shelves exert a stabilizing force onto the inland ice sheet. However, this buttressing effect is diminished by the fracture process, which on large scales effectively softens the ice, accelerating its flow, increasing calving, and potentially leading to ice shelf breakup. We add a continuum damage model (CDM) to the BISICLES ice sheet model, which is intended to model the localized opening of crevasses under stress, the transport of those crevasses through the ice sheet, and the coupling between crevasse depth and the ice flow field and to carry out idealized numerical experiments examining the broad impact on large-scale ice sheet and shelf dynamics. In each case we see a complex pattern of damage evolve over time, with an eventual loss of buttressing approximately equivalent to halving the thickness of the ice shelf. We find that it is possible to achieve a similar ice flow pattern using a simple rule of thumb: introducing an enhancement factor ∼ 10 everywhere in the model domain. However, spatially varying damage (or equivalently, enhancement factor) fields set at the start of prognostic calculations to match velocity observations, as is widely done in ice sheet simulations, ought to evolve in time, or grounding line retreat can be slowed by an order of magnitude. |
format |
Article in Journal/Newspaper |
author |
S. Sun S. L. Cornford J. C. Moore R. Gladstone L. Zhao |
author_facet |
S. Sun S. L. Cornford J. C. Moore R. Gladstone L. Zhao |
author_sort |
S. Sun |
title |
Ice shelf fracture parameterization in an ice sheet model |
title_short |
Ice shelf fracture parameterization in an ice sheet model |
title_full |
Ice shelf fracture parameterization in an ice sheet model |
title_fullStr |
Ice shelf fracture parameterization in an ice sheet model |
title_full_unstemmed |
Ice shelf fracture parameterization in an ice sheet model |
title_sort |
ice shelf fracture parameterization in an ice sheet model |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-2543-2017 https://doaj.org/article/0ed874b3228849f3837e6246961843d9 |
long_lat |
ENVELOPE(-64.259,-64.259,-65.247,-65.247) |
geographic |
Thumb |
geographic_facet |
Thumb |
genre |
Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_source |
The Cryosphere, Vol 11, Pp 2543-2554 (2017) |
op_relation |
https://www.the-cryosphere.net/11/2543/2017/tc-11-2543-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-2543-2017 1994-0416 1994-0424 https://doaj.org/article/0ed874b3228849f3837e6246961843d9 |
op_doi |
https://doi.org/10.5194/tc-11-2543-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
6 |
container_start_page |
2543 |
op_container_end_page |
2554 |
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1766030012356493312 |