Responses of 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...
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ftcopernicus:oai:publications.copernicus.org:egusphere116556 2024-06-23T07:47:47+00:00 Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations Joughin, Ian Shapero, Daniel Dutrieux, Pierre 2024-05-28 application/pdf https://doi.org/10.5194/egusphere-2023-2929 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/ eng eng doi:10.5194/egusphere-2023-2929 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2023-2929 2024-06-13T01:23:50Z 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. Text Antarc* Antarctica Ice Shelf Pine Island Pine Island Glacier Copernicus Publications: E-Journals 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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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
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 |
Text |
author |
Joughin, Ian Shapero, Daniel Dutrieux, Pierre |
spellingShingle |
Joughin, Ian Shapero, Daniel Dutrieux, Pierre Responses of Pine Island and Thwaites Glaciers to Melt and Sliding Parameterizations |
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 |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2023-2929 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/ |
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_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2023-2929 https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2929/ |
op_doi |
https://doi.org/10.5194/egusphere-2023-2929 |
_version_ |
1802637942539157504 |