Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes
The grounding line, delineating the boundary where a grounded glacier goes afloat in ocean water, shifts in response to tidal cycles. Here we analyze COSMO-SkyMed Differential Interferometric Synthetic Aperture Radar data acquired in 2020 and 2021 over Totten, Moscow University, and Rennick glaciers...
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ftcopernicus:oai:publications.copernicus.org:egusphere118989 2024-06-23T07:47:34+00:00 Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes Maslennikova, Natalya Milillo, Pietro Nakshatrala, Kalyana Babu Ballarini, Roberto Stubblefield, Aaron Dini, Luigi 2024-04-15 application/pdf https://doi.org/10.5194/egusphere-2024-875 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-875/ eng eng doi:10.5194/egusphere-2024-875 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-875/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-875 2024-06-13T01:25:01Z The grounding line, delineating the boundary where a grounded glacier goes afloat in ocean water, shifts in response to tidal cycles. Here we analyze COSMO-SkyMed Differential Interferometric Synthetic Aperture Radar data acquired in 2020 and 2021 over Totten, Moscow University, and Rennick glaciers in East Antarctica, detecting tide-induced grounding line position variations from 0.5 to 12.5 km along prograde slopes ranging from ~0 to 5 %. Considering a glacier as a non-Newtonian fluid, we provide two-dimensional formulations of the viscous and viscoelastic short-term behavior of a glacier in partial frictional contact with the bedrock, and partially floating on sea water. Since the models’ equations are not amenable to analytical treatment, numerical solutions are obtained using FEniCS, an open-source Python package. We establish the dependence of the grounding zone width on glacier thickness, bed slope, and glacier flow speed. The predictions of the viscoelastic model match ~93 % of all the DInSAR grounding zone measurements and are 71 % more accurate than those of the viscous model. The results of this study underscore the critical role played by ice elasticity in continuum mechanics-based glacier models, and being validated with the DInSAR measurements, can be used in other studies on glaciers. Text Antarc* Antarctica East Antarctica Copernicus Publications: E-Journals East Antarctica Rennick ENVELOPE(161.500,161.500,-72.000,-72.000) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The grounding line, delineating the boundary where a grounded glacier goes afloat in ocean water, shifts in response to tidal cycles. Here we analyze COSMO-SkyMed Differential Interferometric Synthetic Aperture Radar data acquired in 2020 and 2021 over Totten, Moscow University, and Rennick glaciers in East Antarctica, detecting tide-induced grounding line position variations from 0.5 to 12.5 km along prograde slopes ranging from ~0 to 5 %. Considering a glacier as a non-Newtonian fluid, we provide two-dimensional formulations of the viscous and viscoelastic short-term behavior of a glacier in partial frictional contact with the bedrock, and partially floating on sea water. Since the models’ equations are not amenable to analytical treatment, numerical solutions are obtained using FEniCS, an open-source Python package. We establish the dependence of the grounding zone width on glacier thickness, bed slope, and glacier flow speed. The predictions of the viscoelastic model match ~93 % of all the DInSAR grounding zone measurements and are 71 % more accurate than those of the viscous model. The results of this study underscore the critical role played by ice elasticity in continuum mechanics-based glacier models, and being validated with the DInSAR measurements, can be used in other studies on glaciers. |
format |
Text |
author |
Maslennikova, Natalya Milillo, Pietro Nakshatrala, Kalyana Babu Ballarini, Roberto Stubblefield, Aaron Dini, Luigi |
spellingShingle |
Maslennikova, Natalya Milillo, Pietro Nakshatrala, Kalyana Babu Ballarini, Roberto Stubblefield, Aaron Dini, Luigi Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
author_facet |
Maslennikova, Natalya Milillo, Pietro Nakshatrala, Kalyana Babu Ballarini, Roberto Stubblefield, Aaron Dini, Luigi |
author_sort |
Maslennikova, Natalya |
title |
Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
title_short |
Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
title_full |
Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
title_fullStr |
Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
title_full_unstemmed |
Importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
title_sort |
importance of ice elasticity in simulating tide-induced grounding line variations along prograde bed slopes |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-875 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-875/ |
long_lat |
ENVELOPE(161.500,161.500,-72.000,-72.000) |
geographic |
East Antarctica Rennick |
geographic_facet |
East Antarctica Rennick |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2024-875 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-875/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-875 |
_version_ |
1802651701270806528 |