Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations
Pine Island and Thwaites glaciers are the two largest contributors to sea level rise from Antarctica. Here we examine the influence of basal friction and melt in determining projected losses. We examine both Weertman and Coulomb friction laws with explicit weakening as the ice thins to flotation, wh...
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00070910 2024-02-11T09:58:12+01:00 Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations Joughin, Ian Shapero, Daniel Dutrieux, Pierre 2024-01 electronic https://doi.org/10.5194/egusphere-2023-2929 https://noa.gwlb.de/receive/cop_mods_00070910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069235/egusphere-2023-2929.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/egusphere-2023-2929.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-2929 https://noa.gwlb.de/receive/cop_mods_00070910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069235/egusphere-2023-2929.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/egusphere-2023-2929.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-2929 2024-01-15T00:22:45Z Pine Island and Thwaites glaciers are the two largest contributors to sea level rise from Antarctica. Here we examine the influence of basal friction and melt in determining projected losses. We examine both Weertman and Coulomb friction laws with explicit weakening as the ice thins to flotation, which many friction laws include implicitly via the effective pressure. We find relatively small differences with the choice of friction law (Weertman or Coulomb) but find losses are highly sensitive to the rate at which the basal traction is reduced as the area above the grounding line thins. Consistent with earlier work on Pine Island Glacier, we find sea level contributions from both glaciers vary linearly with the melt volume averaged over time and space, with little influence from the spatial or temporal distribution of melt. Based on recent estimates of melt from other studies, our work simulations suggest that melt-driven combined sea-level rise contribution from both glaciers is unlikely to exceed 10 cm by 2200. We do not include other factors, such as ice shelf breakup that might increase loss, nor factors such as increased accumulation and isostatic uplift that may mitigate loss. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Pine Island Pine Island Glacier Niedersächsisches Online-Archiv NOA Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Weertman ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Joughin, Ian Shapero, Daniel Dutrieux, Pierre Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
topic_facet |
article Verlagsveröffentlichung |
description |
Pine Island and Thwaites glaciers are the two largest contributors to sea level rise from Antarctica. Here we examine the influence of basal friction and melt in determining projected losses. We examine both Weertman and Coulomb friction laws with explicit weakening as the ice thins to flotation, which many friction laws include implicitly via the effective pressure. We find relatively small differences with the choice of friction law (Weertman or Coulomb) but find losses are highly sensitive to the rate at which the basal traction is reduced as the area above the grounding line thins. Consistent with earlier work on Pine Island Glacier, we find sea level contributions from both glaciers vary linearly with the melt volume averaged over time and space, with little influence from the spatial or temporal distribution of melt. Based on recent estimates of melt from other studies, our work simulations suggest that melt-driven combined sea-level rise contribution from both glaciers is unlikely to exceed 10 cm by 2200. We do not include other factors, such as ice shelf breakup that might increase loss, nor factors such as increased accumulation and isostatic uplift that may mitigate loss. |
format |
Article in Journal/Newspaper |
author |
Joughin, Ian Shapero, Daniel Dutrieux, Pierre |
author_facet |
Joughin, Ian Shapero, Daniel Dutrieux, Pierre |
author_sort |
Joughin, Ian |
title |
Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
title_short |
Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
title_full |
Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
title_fullStr |
Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
title_full_unstemmed |
Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
title_sort |
responses of pine island and thwaites glaciers to melt and sliding parameterizations |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2023-2929 https://noa.gwlb.de/receive/cop_mods_00070910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069235/egusphere-2023-2929.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/egusphere-2023-2929.pdf |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
geographic |
Pine Island Glacier Weertman |
geographic_facet |
Pine Island Glacier Weertman |
genre |
Antarc* Antarctica Ice Shelf Pine Island Pine Island Glacier |
genre_facet |
Antarc* Antarctica Ice Shelf Pine Island Pine Island Glacier |
op_relation |
https://doi.org/10.5194/egusphere-2023-2929 https://noa.gwlb.de/receive/cop_mods_00070910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069235/egusphere-2023-2929.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/egusphere-2023-2929.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-2929 |
_version_ |
1790593802075897856 |