Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice
This paper concerns a numerical stabilization method for free-surface ice flow called the free-surface stabilization algorithm (FSSA). In the current study, the FSSA is implemented into the numerical ice-flow software Elmer/Ice and tested on synthetic two-dimensional (2D) glaciers, as well as on the...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00068095 2023-09-05T13:19:39+02:00 Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice Löfgren, André Zwinger, Thomas Råback, Peter Helanow, Christian Ahlkrona, Josefin 2023-08 electronic https://doi.org/10.5194/egusphere-2023-1507 https://noa.gwlb.de/receive/cop_mods_00068095 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066529/egusphere-2023-1507.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1507/egusphere-2023-1507.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-1507 https://noa.gwlb.de/receive/cop_mods_00068095 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066529/egusphere-2023-1507.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1507/egusphere-2023-1507.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-1507 2023-08-13T23:19:56Z This paper concerns a numerical stabilization method for free-surface ice flow called the free-surface stabilization algorithm (FSSA). In the current study, the FSSA is implemented into the numerical ice-flow software Elmer/Ice and tested on synthetic two-dimensional (2D) glaciers, as well as on the real-world glacier of Midtre Lovénbreen, Svalbard. For the synthetic 2D cases it is found that the FSSA method increases the largest stable time-step size at least by a factor of ten for the case of a gently sloping ice surface (3°), and by at least a factor of five for cases of moderately to steeply inclined surfaces (6° to 12°) . Furthermore, the FSSA method increases the overall accuracy for all surface slopes. The largest stable time-step size is found to be smallest for the case of a low sloping surface, despite having overall smaller velocities. For Midtre Lovénbreen the FSSA method doubles the largest stable time-step size, however, the accuracy is in this case slightly lowered in the deeper parts of the glacier, while it increases near edges. The implication is that the non-FSSA method might be more accurate at predicting glacier thinning, while the FSSA method is more suitable for predicting future glacier extent. A possible application of the larger time-step sizes allowed for by the FSSA is for spin-up simulations, where relatively fast changing climate data can be incorporated on short time scales, while the slowly changing velocity field is updated over larger time scales. Article in Journal/Newspaper glacier Svalbard Niedersächsisches Online-Archiv NOA Svalbard |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Löfgren, André Zwinger, Thomas Råback, Peter Helanow, Christian Ahlkrona, Josefin Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice |
topic_facet |
article Verlagsveröffentlichung |
description |
This paper concerns a numerical stabilization method for free-surface ice flow called the free-surface stabilization algorithm (FSSA). In the current study, the FSSA is implemented into the numerical ice-flow software Elmer/Ice and tested on synthetic two-dimensional (2D) glaciers, as well as on the real-world glacier of Midtre Lovénbreen, Svalbard. For the synthetic 2D cases it is found that the FSSA method increases the largest stable time-step size at least by a factor of ten for the case of a gently sloping ice surface (3°), and by at least a factor of five for cases of moderately to steeply inclined surfaces (6° to 12°) . Furthermore, the FSSA method increases the overall accuracy for all surface slopes. The largest stable time-step size is found to be smallest for the case of a low sloping surface, despite having overall smaller velocities. For Midtre Lovénbreen the FSSA method doubles the largest stable time-step size, however, the accuracy is in this case slightly lowered in the deeper parts of the glacier, while it increases near edges. The implication is that the non-FSSA method might be more accurate at predicting glacier thinning, while the FSSA method is more suitable for predicting future glacier extent. A possible application of the larger time-step sizes allowed for by the FSSA is for spin-up simulations, where relatively fast changing climate data can be incorporated on short time scales, while the slowly changing velocity field is updated over larger time scales. |
format |
Article in Journal/Newspaper |
author |
Löfgren, André Zwinger, Thomas Råback, Peter Helanow, Christian Ahlkrona, Josefin |
author_facet |
Löfgren, André Zwinger, Thomas Råback, Peter Helanow, Christian Ahlkrona, Josefin |
author_sort |
Löfgren, André |
title |
Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice |
title_short |
Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice |
title_full |
Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice |
title_fullStr |
Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice |
title_full_unstemmed |
Increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in Elmer/Ice |
title_sort |
increasing numerical stability of mountain valley glacier simulations: implementation and testing of free-surface stabilization in elmer/ice |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-1507 https://noa.gwlb.de/receive/cop_mods_00068095 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066529/egusphere-2023-1507.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1507/egusphere-2023-1507.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard |
genre_facet |
glacier Svalbard |
op_relation |
https://doi.org/10.5194/egusphere-2023-1507 https://noa.gwlb.de/receive/cop_mods_00068095 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066529/egusphere-2023-1507.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1507/egusphere-2023-1507.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-1507 |
_version_ |
1776200446697799680 |