Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling
Modeling ice sheet instabilities is a numerical challenge of potentially high real-world relevance. Yet, differentiating between the impacts of model physics, numerical implementation choices, and numerical errors is not straightforward. Here, we use an idealized North American geometry and climate...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00069212 2023-11-12T04:18:43+01:00 Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling Hank, Kevin Tarasov, Lev Mantelli, Elisa 2023-10 electronic https://doi.org/10.5194/gmd-16-5627-2023 https://noa.gwlb.de/receive/cop_mods_00069212 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067605/gmd-16-5627-2023.pdf https://gmd.copernicus.org/articles/16/5627/2023/gmd-16-5627-2023.pdf eng eng Copernicus Publications Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-16-5627-2023 https://noa.gwlb.de/receive/cop_mods_00069212 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067605/gmd-16-5627-2023.pdf https://gmd.copernicus.org/articles/16/5627/2023/gmd-16-5627-2023.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/gmd-16-5627-2023 2023-10-15T23:22:18Z Modeling ice sheet instabilities is a numerical challenge of potentially high real-world relevance. Yet, differentiating between the impacts of model physics, numerical implementation choices, and numerical errors is not straightforward. Here, we use an idealized North American geometry and climate representation (similarly to the HEINO (Heinrich Event INtercOmparison) experiments – Calov et al., 2010) to examine the process and numerical sensitivity of ice stream surge cycling in ice flow models. Through sensitivity tests, we identify some numerical requirements for a more robust model configuration for such contexts. To partly address model-specific dependencies, we use both the Glacial Systems Model (GSM) and the Parallel Ice Sheet Model (PISM). We show that modeled surge characteristics are resolution dependent, though they converge (decreased differences between resolutions) at finer horizontal grid resolutions. Discrepancies between fine and coarse horizontal grid resolutions can be reduced by incorporating sliding at sub-freezing temperatures. The inclusion of basal hydrology increases the ice volume lost during surges, whereas the dampening of basal-temperature changes due to a bed thermal model leads to a decrease. Article in Journal/Newspaper Ice Sheet Niedersächsisches Online-Archiv NOA Geoscientific Model Development 16 19 5627 5652 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Hank, Kevin Tarasov, Lev Mantelli, Elisa Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
topic_facet |
article Verlagsveröffentlichung |
description |
Modeling ice sheet instabilities is a numerical challenge of potentially high real-world relevance. Yet, differentiating between the impacts of model physics, numerical implementation choices, and numerical errors is not straightforward. Here, we use an idealized North American geometry and climate representation (similarly to the HEINO (Heinrich Event INtercOmparison) experiments – Calov et al., 2010) to examine the process and numerical sensitivity of ice stream surge cycling in ice flow models. Through sensitivity tests, we identify some numerical requirements for a more robust model configuration for such contexts. To partly address model-specific dependencies, we use both the Glacial Systems Model (GSM) and the Parallel Ice Sheet Model (PISM). We show that modeled surge characteristics are resolution dependent, though they converge (decreased differences between resolutions) at finer horizontal grid resolutions. Discrepancies between fine and coarse horizontal grid resolutions can be reduced by incorporating sliding at sub-freezing temperatures. The inclusion of basal hydrology increases the ice volume lost during surges, whereas the dampening of basal-temperature changes due to a bed thermal model leads to a decrease. |
format |
Article in Journal/Newspaper |
author |
Hank, Kevin Tarasov, Lev Mantelli, Elisa |
author_facet |
Hank, Kevin Tarasov, Lev Mantelli, Elisa |
author_sort |
Hank, Kevin |
title |
Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
title_short |
Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
title_full |
Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
title_fullStr |
Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
title_full_unstemmed |
Modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
title_sort |
modeling sensitivities of thermally and hydraulically driven ice stream surge cycling |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/gmd-16-5627-2023 https://noa.gwlb.de/receive/cop_mods_00069212 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067605/gmd-16-5627-2023.pdf https://gmd.copernicus.org/articles/16/5627/2023/gmd-16-5627-2023.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-16-5627-2023 https://noa.gwlb.de/receive/cop_mods_00069212 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067605/gmd-16-5627-2023.pdf https://gmd.copernicus.org/articles/16/5627/2023/gmd-16-5627-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/gmd-16-5627-2023 |
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Geoscientific Model Development |
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5627 |
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5652 |
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