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...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2017
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-11-2543-2017 https://noa.gwlb.de/receive/cop_mods_00008179 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008136/tc-11-2543-2017.pdf https://tc.copernicus.org/articles/11/2543/2017/tc-11-2543-2017.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00008179 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00008179 2023-05-15T16:39:41+02:00 Ice shelf fracture parameterization in an ice sheet model Sun, Sainan Cornford, Stephen L. Moore, John C. Gladstone, Rupert Zhao, Liyun 2017-11 electronic https://doi.org/10.5194/tc-11-2543-2017 https://noa.gwlb.de/receive/cop_mods_00008179 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008136/tc-11-2543-2017.pdf https://tc.copernicus.org/articles/11/2543/2017/tc-11-2543-2017.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-11-2543-2017 https://noa.gwlb.de/receive/cop_mods_00008179 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008136/tc-11-2543-2017.pdf https://tc.copernicus.org/articles/11/2543/2017/tc-11-2543-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/tc-11-2543-2017 2022-02-08T22:58:10Z 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 Niedersächsisches Online-Archiv NOA Thumb ENVELOPE(-64.259,-64.259,-65.247,-65.247) The Cryosphere 11 6 2543 2554 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Sun, Sainan Cornford, Stephen L. Moore, John C. Gladstone, Rupert Zhao, Liyun Ice shelf fracture parameterization in an ice sheet model |
topic_facet |
article Verlagsveröffentlichung |
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 |
Sun, Sainan Cornford, Stephen L. Moore, John C. Gladstone, Rupert Zhao, Liyun |
author_facet |
Sun, Sainan Cornford, Stephen L. Moore, John C. Gladstone, Rupert Zhao, Liyun |
author_sort |
Sun, Sainan |
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://noa.gwlb.de/receive/cop_mods_00008179 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008136/tc-11-2543-2017.pdf https://tc.copernicus.org/articles/11/2543/2017/tc-11-2543-2017.pdf |
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_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-11-2543-2017 https://noa.gwlb.de/receive/cop_mods_00008179 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008136/tc-11-2543-2017.pdf https://tc.copernicus.org/articles/11/2543/2017/tc-11-2543-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
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 |
_version_ |
1766030008342544384 |