Antarctic grounding zone characteristics from CryoSat-2
We present the results of mapping the limit of tidal flexure (point F) and hydrostatic equilibrium (point H) of the grounding zone of Antarctic ice shelves from CryoSat-2 standard and swath elevation data. Overall we were able to map 41 % of the grounding zone of the larger floating ice shelves and...
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ftcopernicus:oai:publications.copernicus.org:tcd79535 2023-05-15T13:22:09+02:00 Antarctic grounding zone characteristics from CryoSat-2 Dawson, Geoffrey J. Bamber, Jonathan L. 2019-10-08 application/pdf https://doi.org/10.5194/tc-2019-196 https://www.the-cryosphere-discuss.net/tc-2019-196/ eng eng doi:10.5194/tc-2019-196 https://www.the-cryosphere-discuss.net/tc-2019-196/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-2019-196 2019-12-24T09:48:23Z We present the results of mapping the limit of tidal flexure (point F) and hydrostatic equilibrium (point H) of the grounding zone of Antarctic ice shelves from CryoSat-2 standard and swath elevation data. Overall we were able to map 41 % of the grounding zone of the larger floating ice shelves and outlet glaciers in Antarctica. We obtain near-complete coverage of the Filchner-Ronne Ice Shelf and partial coverage of the Ross Ice Shelf, Dronning Maud land and the Antarctic Peninsula, while we could not map a continuous grounding zone for the Amery Ice Shelf and the Amundsen Sea Sector. Tidal amplitude and distance south (i.e. across track spacing) are controlling factors in the quality of the coverage and performance of the approach. The location of the point F agrees well with previous observations that used differential satellite radar interferometry (DInSAR) and ICESat-1, with an average landward bias of 0.1 km and 0.6 km and standard deviation of 1.1 km and 1.5 km for DInSAR and ICESat measurements, respectively. We also compared the results directly with DInSAR interferograms from the Sentinel-1 satellites, acquired over the Evans Ice Stream and the Carlson Inlet (Ronne Ice Shelf) and found good agreement with the mapped points F and H. We present the results of the spatial distribution of the grounding zone width (the distance between points F and H), and used a simple elastic beam model to investigate the relationship between ice thickness and grounding zone width. Text Amery Ice Shelf Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Copernicus Publications: E-Journals Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Amundsen Sea Antarctic Antarctic Peninsula Carlson Inlet ENVELOPE(-80.000,-80.000,-77.833,-77.833) Dronning Maud Land Evans Ice Stream ENVELOPE(-78.000,-78.000,-76.000,-76.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Ross Ice Shelf The Antarctic The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We present the results of mapping the limit of tidal flexure (point F) and hydrostatic equilibrium (point H) of the grounding zone of Antarctic ice shelves from CryoSat-2 standard and swath elevation data. Overall we were able to map 41 % of the grounding zone of the larger floating ice shelves and outlet glaciers in Antarctica. We obtain near-complete coverage of the Filchner-Ronne Ice Shelf and partial coverage of the Ross Ice Shelf, Dronning Maud land and the Antarctic Peninsula, while we could not map a continuous grounding zone for the Amery Ice Shelf and the Amundsen Sea Sector. Tidal amplitude and distance south (i.e. across track spacing) are controlling factors in the quality of the coverage and performance of the approach. The location of the point F agrees well with previous observations that used differential satellite radar interferometry (DInSAR) and ICESat-1, with an average landward bias of 0.1 km and 0.6 km and standard deviation of 1.1 km and 1.5 km for DInSAR and ICESat measurements, respectively. We also compared the results directly with DInSAR interferograms from the Sentinel-1 satellites, acquired over the Evans Ice Stream and the Carlson Inlet (Ronne Ice Shelf) and found good agreement with the mapped points F and H. We present the results of the spatial distribution of the grounding zone width (the distance between points F and H), and used a simple elastic beam model to investigate the relationship between ice thickness and grounding zone width. |
format |
Text |
author |
Dawson, Geoffrey J. Bamber, Jonathan L. |
spellingShingle |
Dawson, Geoffrey J. Bamber, Jonathan L. Antarctic grounding zone characteristics from CryoSat-2 |
author_facet |
Dawson, Geoffrey J. Bamber, Jonathan L. |
author_sort |
Dawson, Geoffrey J. |
title |
Antarctic grounding zone characteristics from CryoSat-2 |
title_short |
Antarctic grounding zone characteristics from CryoSat-2 |
title_full |
Antarctic grounding zone characteristics from CryoSat-2 |
title_fullStr |
Antarctic grounding zone characteristics from CryoSat-2 |
title_full_unstemmed |
Antarctic grounding zone characteristics from CryoSat-2 |
title_sort |
antarctic grounding zone characteristics from cryosat-2 |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-2019-196 https://www.the-cryosphere-discuss.net/tc-2019-196/ |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(-80.000,-80.000,-77.833,-77.833) ENVELOPE(-78.000,-78.000,-76.000,-76.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Amery Amery Ice Shelf Amundsen Sea Antarctic Antarctic Peninsula Carlson Inlet Dronning Maud Land Evans Ice Stream Ronne Ice Shelf Ross Ice Shelf The Antarctic The Sentinel |
geographic_facet |
Amery Amery Ice Shelf Amundsen Sea Antarctic Antarctic Peninsula Carlson Inlet Dronning Maud Land Evans Ice Stream Ronne Ice Shelf Ross Ice Shelf The Antarctic The Sentinel |
genre |
Amery Ice Shelf Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf |
genre_facet |
Amery Ice Shelf Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2019-196 https://www.the-cryosphere-discuss.net/tc-2019-196/ |
op_doi |
https://doi.org/10.5194/tc-2019-196 |
_version_ |
1766363488884621312 |