Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves
The buoyancy boundary condition applied to floating portions of ice sheets and glaciers in Stokes models requires special consideration when the glacier rapidly departs from hydrostatic equilibrium. This boundary condition can manifest in velocity fields that are unphysically (and strongly) dependen...
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Copernicus Publications
2020
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ftdoajarticles:oai:doaj.org/article:baacce07730e4b3e9b01e8528b53f892 2023-05-15T16:41:58+02:00 Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves B. Berg J. Bassis 2020-09-01T00:00:00Z https://doi.org/10.5194/tc-14-3209-2020 https://doaj.org/article/baacce07730e4b3e9b01e8528b53f892 EN eng Copernicus Publications https://tc.copernicus.org/articles/14/3209/2020/tc-14-3209-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-3209-2020 1994-0416 1994-0424 https://doaj.org/article/baacce07730e4b3e9b01e8528b53f892 The Cryosphere, Vol 14, Pp 3209-3213 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-3209-2020 2022-12-31T01:54:59Z The buoyancy boundary condition applied to floating portions of ice sheets and glaciers in Stokes models requires special consideration when the glacier rapidly departs from hydrostatic equilibrium. This boundary condition can manifest in velocity fields that are unphysically (and strongly) dependent on time step size, thereby contaminating diagnostic stress fields. This can be especially problematic for models of calving glaciers, where rapid changes in geometry cause configurations that suddenly depart from hydrostatic equilibrium and lead to inaccurate estimates of the stress field. Here we show that the unphysical behavior can be cured with minimal computational cost by reintroducing a regularization that corresponds to the acceleration term in the stress balance. This regularization provides consistent velocity solutions for all time step sizes. Article in Journal/Newspaper Ice Shelves The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 14 9 3209 3213 |
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 B. Berg J. Bassis Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The buoyancy boundary condition applied to floating portions of ice sheets and glaciers in Stokes models requires special consideration when the glacier rapidly departs from hydrostatic equilibrium. This boundary condition can manifest in velocity fields that are unphysically (and strongly) dependent on time step size, thereby contaminating diagnostic stress fields. This can be especially problematic for models of calving glaciers, where rapid changes in geometry cause configurations that suddenly depart from hydrostatic equilibrium and lead to inaccurate estimates of the stress field. Here we show that the unphysical behavior can be cured with minimal computational cost by reintroducing a regularization that corresponds to the acceleration term in the stress balance. This regularization provides consistent velocity solutions for all time step sizes. |
format |
Article in Journal/Newspaper |
author |
B. Berg J. Bassis |
author_facet |
B. Berg J. Bassis |
author_sort |
B. Berg |
title |
Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves |
title_short |
Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves |
title_full |
Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves |
title_fullStr |
Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves |
title_full_unstemmed |
Brief communication: Time step dependence (and fixes) in Stokes simulations of calving ice shelves |
title_sort |
brief communication: time step dependence (and fixes) in stokes simulations of calving ice shelves |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-3209-2020 https://doaj.org/article/baacce07730e4b3e9b01e8528b53f892 |
genre |
Ice Shelves The Cryosphere |
genre_facet |
Ice Shelves The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 3209-3213 (2020) |
op_relation |
https://tc.copernicus.org/articles/14/3209/2020/tc-14-3209-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-3209-2020 1994-0416 1994-0424 https://doaj.org/article/baacce07730e4b3e9b01e8528b53f892 |
op_doi |
https://doi.org/10.5194/tc-14-3209-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
9 |
container_start_page |
3209 |
op_container_end_page |
3213 |
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1766032440492556288 |