Measuring the location and width of the Antarctic grounding zone using CryoSat-2
We present the results of mapping the limit of the 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 31 % of the grounding zone of the Antarctic floating ice shelv...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00051866 2023-05-15T13:22:10+02:00 Measuring the location and width of the Antarctic grounding zone using CryoSat-2 Dawson, Geoffrey J. Bamber, Jonathan L. 2020-06 electronic https://doi.org/10.5194/tc-14-2071-2020 https://noa.gwlb.de/receive/cop_mods_00051866 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051522/tc-14-2071-2020.pdf https://tc.copernicus.org/articles/14/2071/2020/tc-14-2071-2020.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-14-2071-2020 https://noa.gwlb.de/receive/cop_mods_00051866 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051522/tc-14-2071-2020.pdf https://tc.copernicus.org/articles/14/2071/2020/tc-14-2071-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/tc-14-2071-2020 2022-02-08T22:36:13Z We present the results of mapping the limit of the 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 31 % of the grounding zone of the Antarctic floating ice shelves and outlet glaciers. We obtain near-complete coverage of the Filchner–Ronne Ice Shelf. Here we manage to map areas of Support Force Glacier and the Doake Ice Rumples, which have previously only been mapped using break-in-slope methods. Over the Ross Ice Shelf, Dronning Maud Land and the Antarctic Peninsula, we obtained partial coverage, and 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 and 0.6 km and standard deviation of 1.1 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 also 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, along with ice thickness calculations, to calculate an effective Young modulus of ice of E=1.4±0.9 GPa. Article in Journal/Newspaper Amery Ice Shelf Amundsen Sea Antarc* Antarctic Antarctic Peninsula Dronning Maud Land Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Support Force Glacier The Cryosphere Niedersächsisches Online-Archiv NOA 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) Doake Ice Rumples ENVELOPE(-67.000,-67.000,-79.750,-79.750) 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 Support Force Glacier ENVELOPE(-47.500,-47.500,-83.083,-83.083) The Antarctic The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) The Cryosphere 14 6 2071 2086 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Dawson, Geoffrey J. Bamber, Jonathan L. Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
topic_facet |
article Verlagsveröffentlichung |
description |
We present the results of mapping the limit of the 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 31 % of the grounding zone of the Antarctic floating ice shelves and outlet glaciers. We obtain near-complete coverage of the Filchner–Ronne Ice Shelf. Here we manage to map areas of Support Force Glacier and the Doake Ice Rumples, which have previously only been mapped using break-in-slope methods. Over the Ross Ice Shelf, Dronning Maud Land and the Antarctic Peninsula, we obtained partial coverage, and 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 and 0.6 km and standard deviation of 1.1 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 also 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, along with ice thickness calculations, to calculate an effective Young modulus of ice of E=1.4±0.9 GPa. |
format |
Article in Journal/Newspaper |
author |
Dawson, Geoffrey J. Bamber, Jonathan L. |
author_facet |
Dawson, Geoffrey J. Bamber, Jonathan L. |
author_sort |
Dawson, Geoffrey J. |
title |
Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
title_short |
Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
title_full |
Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
title_fullStr |
Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
title_full_unstemmed |
Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
title_sort |
measuring the location and width of the antarctic grounding zone using cryosat-2 |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-2071-2020 https://noa.gwlb.de/receive/cop_mods_00051866 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051522/tc-14-2071-2020.pdf https://tc.copernicus.org/articles/14/2071/2020/tc-14-2071-2020.pdf |
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(-67.000,-67.000,-79.750,-79.750) ENVELOPE(-78.000,-78.000,-76.000,-76.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-47.500,-47.500,-83.083,-83.083) ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Amery Amery Ice Shelf Amundsen Sea Antarctic Antarctic Peninsula Carlson Inlet Doake Ice Rumples Dronning Maud Land Evans Ice Stream Ronne Ice Shelf Ross Ice Shelf Support Force Glacier The Antarctic The Sentinel |
geographic_facet |
Amery Amery Ice Shelf Amundsen Sea Antarctic Antarctic Peninsula Carlson Inlet Doake Ice Rumples Dronning Maud Land Evans Ice Stream Ronne Ice Shelf Ross Ice Shelf Support Force Glacier The Antarctic The Sentinel |
genre |
Amery Ice Shelf Amundsen Sea Antarc* Antarctic Antarctic Peninsula Dronning Maud Land Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Support Force Glacier The Cryosphere |
genre_facet |
Amery Ice Shelf Amundsen Sea Antarc* Antarctic Antarctic Peninsula Dronning Maud Land Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Ross Ice Shelf Support Force 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-14-2071-2020 https://noa.gwlb.de/receive/cop_mods_00051866 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051522/tc-14-2071-2020.pdf https://tc.copernicus.org/articles/14/2071/2020/tc-14-2071-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-2071-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
6 |
container_start_page |
2071 |
op_container_end_page |
2086 |
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1766363593235759104 |