Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf
We examine tidal flexure in the grounding zone of the McMurdo Ice Shelf, Antarctica, using a combination of TerraSAR-X repeat-pass radar interferometry, a precise digital elevation model, and GPS ground validation data. Satellite and field data were acquired in tandem between October and December 20...
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ftdlr:oai:elib.dlr.de:116383 2023-05-15T13:41:35+02:00 Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf Rack, W. King, Matt Marsh, O.J. Wild, Christian T. Floricioiu, Dana 2017-11-03 application/pdf https://elib.dlr.de/116383/ https://elib.dlr.de/116383/1/Rack_et_al_IceShelfFlexure_tc-11-2481-2017.pdf https://www.the-cryosphere.net/11/2481/2017/tc-11-2481-2017.html en eng Copernicus Publications https://elib.dlr.de/116383/1/Rack_et_al_IceShelfFlexure_tc-11-2481-2017.pdf Rack, W. und King, Matt und Marsh, O.J. und Wild, Christian T. und Floricioiu, Dana (2017) Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf. The Cryosphere, 11 (6), Seiten 2481-2490. Copernicus Publications. DOI:10.5194/tc-11-2481-2017 ISSN 1994-0416 SAR-Signalverarbeitung Zeitschriftenbeitrag PeerReviewed 2017 ftdlr https://doi.org/10.5194/tc-11-2481-2017 2019-01-13T23:52:21Z We examine tidal flexure in the grounding zone of the McMurdo Ice Shelf, Antarctica, using a combination of TerraSAR-X repeat-pass radar interferometry, a precise digital elevation model, and GPS ground validation data. Satellite and field data were acquired in tandem between October and December 2014. Our GPS data show a horizontal modulation of up to 60 % of the vertical displacement amplitude at tidal periods within a few kilometres of the grounding line. We ascribe the observed oscillatory horizontal motion to varying bending stresses and account for it using a simple elastic beam model. The horizontal surface strain is removed from nine differential interferograms to obtain precise bending curves. They reveal a fixed (as opposed to tidally migrating) grounding-line position and eliminate the possibility of significant upstream bending at this location. The consequence of apparent vertical motion due to uncorrected horizontal strain in interferometric data is a systematic mislocation of the interferometric grounding line by up to the order of one ice thickness, or several hundred metres. While our field site was selected due to its simple boundary conditions and low background velocity, our findings are relevant to other grounding zones studied by satellite interferometry, particularly studies looking at tidally induced velocity changes or interpreting satellite-based flexure profiles. Other Non-Article Part of Journal/Newspaper Antarc* Antarctica Ice Shelf McMurdo Ice Shelf The Cryosphere German Aerospace Center: elib - DLR electronic library McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) The Cryosphere 11 6 2481 2490 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
SAR-Signalverarbeitung |
spellingShingle |
SAR-Signalverarbeitung Rack, W. King, Matt Marsh, O.J. Wild, Christian T. Floricioiu, Dana Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf |
topic_facet |
SAR-Signalverarbeitung |
description |
We examine tidal flexure in the grounding zone of the McMurdo Ice Shelf, Antarctica, using a combination of TerraSAR-X repeat-pass radar interferometry, a precise digital elevation model, and GPS ground validation data. Satellite and field data were acquired in tandem between October and December 2014. Our GPS data show a horizontal modulation of up to 60 % of the vertical displacement amplitude at tidal periods within a few kilometres of the grounding line. We ascribe the observed oscillatory horizontal motion to varying bending stresses and account for it using a simple elastic beam model. The horizontal surface strain is removed from nine differential interferograms to obtain precise bending curves. They reveal a fixed (as opposed to tidally migrating) grounding-line position and eliminate the possibility of significant upstream bending at this location. The consequence of apparent vertical motion due to uncorrected horizontal strain in interferometric data is a systematic mislocation of the interferometric grounding line by up to the order of one ice thickness, or several hundred metres. While our field site was selected due to its simple boundary conditions and low background velocity, our findings are relevant to other grounding zones studied by satellite interferometry, particularly studies looking at tidally induced velocity changes or interpreting satellite-based flexure profiles. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Rack, W. King, Matt Marsh, O.J. Wild, Christian T. Floricioiu, Dana |
author_facet |
Rack, W. King, Matt Marsh, O.J. Wild, Christian T. Floricioiu, Dana |
author_sort |
Rack, W. |
title |
Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf |
title_short |
Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf |
title_full |
Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf |
title_fullStr |
Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf |
title_full_unstemmed |
Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf |
title_sort |
analysis of ice shelf flexure and its insar representation in the grounding zone of the southern mcmurdo ice shelf |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://elib.dlr.de/116383/ https://elib.dlr.de/116383/1/Rack_et_al_IceShelfFlexure_tc-11-2481-2017.pdf https://www.the-cryosphere.net/11/2481/2017/tc-11-2481-2017.html |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
McMurdo Ice Shelf |
geographic_facet |
McMurdo Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf McMurdo Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctica Ice Shelf McMurdo Ice Shelf The Cryosphere |
op_relation |
https://elib.dlr.de/116383/1/Rack_et_al_IceShelfFlexure_tc-11-2481-2017.pdf Rack, W. und King, Matt und Marsh, O.J. und Wild, Christian T. und Floricioiu, Dana (2017) Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf. The Cryosphere, 11 (6), Seiten 2481-2490. Copernicus Publications. DOI:10.5194/tc-11-2481-2017 ISSN 1994-0416 |
op_doi |
https://doi.org/10.5194/tc-11-2481-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
6 |
container_start_page |
2481 |
op_container_end_page |
2490 |
_version_ |
1766152729193873408 |