Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations
The 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 ice shelf basal melt in determining projected losses. We examine both Weertman and Coulomb friction laws with explicit weakening as the ice th...
Published in: | The Cryosphere |
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00073880 2024-06-23T07:47:34+00:00 Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations Joughin, Ian Shapero, Daniel Dutrieux, Pierre 2024-05 electronic https://doi.org/10.5194/tc-18-2583-2024 https://noa.gwlb.de/receive/cop_mods_00073880 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072020/tc-18-2583-2024.pdf https://tc.copernicus.org/articles/18/2583/2024/tc-18-2583-2024.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-18-2583-2024 https://noa.gwlb.de/receive/cop_mods_00073880 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072020/tc-18-2583-2024.pdf https://tc.copernicus.org/articles/18/2583/2024/tc-18-2583-2024.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/tc-18-2583-2024 2024-06-03T23:38:30Z The 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 ice shelf basal 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 to be highly sensitive to the rate at which the basal traction is reduced as the area upstream of the grounding line thins. Consistent with earlier work on Pine Island Glacier, we find sea level contributions from both glaciers to 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 simulations suggest that the combined melt-driven and sea level rise contribution from both glaciers may not exceed 10 cm by 2200, although the uncertainty in model parameters allows for larger increases. We do not include other factors, such as ice shelf breakup, that might increase loss, or 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 The Cryosphere 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) The Cryosphere 18 5 2583 2601 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Joughin, Ian Shapero, Daniel Dutrieux, Pierre Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations |
topic_facet |
article Verlagsveröffentlichung |
description |
The 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 ice shelf basal 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 to be highly sensitive to the rate at which the basal traction is reduced as the area upstream of the grounding line thins. Consistent with earlier work on Pine Island Glacier, we find sea level contributions from both glaciers to 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 simulations suggest that the combined melt-driven and sea level rise contribution from both glaciers may not exceed 10 cm by 2200, although the uncertainty in model parameters allows for larger increases. We do not include other factors, such as ice shelf breakup, that might increase loss, or 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 the Pine Island and Thwaites glaciers to melt and sliding parameterizations |
title_short |
Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations |
title_full |
Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations |
title_fullStr |
Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations |
title_full_unstemmed |
Responses of the Pine Island and Thwaites glaciers to melt and sliding parameterizations |
title_sort |
responses of the pine island and thwaites glaciers to melt and sliding parameterizations |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/tc-18-2583-2024 https://noa.gwlb.de/receive/cop_mods_00073880 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072020/tc-18-2583-2024.pdf https://tc.copernicus.org/articles/18/2583/2024/tc-18-2583-2024.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 The Cryosphere |
genre_facet |
Antarc* Antarctica Ice Shelf Pine Island Pine Island Glacier 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-18-2583-2024 https://noa.gwlb.de/receive/cop_mods_00073880 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072020/tc-18-2583-2024.pdf https://tc.copernicus.org/articles/18/2583/2024/tc-18-2583-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-18-2583-2024 |
container_title |
The Cryosphere |
container_volume |
18 |
container_issue |
5 |
container_start_page |
2583 |
op_container_end_page |
2601 |
_version_ |
1802651688206598144 |