Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending
Ice-thickness measurements in Antarctic ice-shelf grounding zones are necessary for calculating the mass balance of individual catchments, but remain poorly constrained for most of the continent. We describe a new inverse modelling optimization approach to estimate ice thickness in the grounding zon...
Published in: | Journal of Glaciology |
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Cambridge University Press
2014
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Online Access: | https://elib.dlr.de/92562/ http://www.igsoc.org/journal/60/221/ |
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ftdlr:oai:elib.dlr.de:92562 2023-05-15T13:49:17+02:00 Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending Marsh, O.J. Rack, W. Golledge, N.R. Lawson, W. Floricioiu, Dana Jacka, T. H. 2014 https://elib.dlr.de/92562/ http://www.igsoc.org/journal/60/221/ unknown Cambridge University Press Marsh, O.J. und Rack, W. und Golledge, N.R. und Lawson, W. und Floricioiu, Dana (2014) Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending. Journal of Glaciology, 60 (221), Seiten 526-536. Cambridge University Press. doi:10.3189/2014JoG13J033 <https://doi.org/10.3189/2014JoG13J033>. ISSN 0022-1430. SAR-Signalverarbeitung Zeitschriftenbeitrag PeerReviewed 2014 ftdlr https://doi.org/10.3189/2014JoG13J033 2021-11-22T00:09:14Z Ice-thickness measurements in Antarctic ice-shelf grounding zones are necessary for calculating the mass balance of individual catchments, but remain poorly constrained for most of the continent. We describe a new inverse modelling optimization approach to estimate ice thickness in the grounding zone of Antarctic outlet glaciers and ice shelves using spatial patterns of tide-induced flexure derived from differential interferometric synthetic aperture radar (InSAR). We demonstrate that the illposedness of the inverse formulation of the elastic-plate equations for bending can be controlled by regularization. In one dimension, the model recreates smooth, synthesized profiles of ice thickness from flexure information to within 1–2%. We test the method in two dimensions and validate it in the grounding zone of Beardmore Glacier, a major outlet glacier in the Transantarctic Mountains, using interferograms created from TerraSAR-X satellite imagery acquired in 2012. We compare our results with historic and modern ice-thickness data (radio-echo sounding from 1967 and ground-penetrating radar from 2010). We match both longitudinal and transverse thickness transects to within 50m root mean-square error using an effective Young’s modulus of 1.4GPa. The highest accuracy is achieved close to the grounded ice boundary, where current estimates of thickness based on surface elevation measurements contain a systematic bias towards thicker ice. Other Non-Article Part of Journal/Newspaper Antarc* Antarctic Beardmore Glacier Ice Shelf Ice Shelves Journal of Glaciology German Aerospace Center: elib - DLR electronic library Antarctic Transantarctic Mountains Beardmore ENVELOPE(174.900,174.900,-83.350,-83.350) Beardmore Glacier ENVELOPE(170.000,170.000,-84.500,-84.500) Journal of Glaciology 60 221 526 536 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
unknown |
topic |
SAR-Signalverarbeitung |
spellingShingle |
SAR-Signalverarbeitung Marsh, O.J. Rack, W. Golledge, N.R. Lawson, W. Floricioiu, Dana Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending |
topic_facet |
SAR-Signalverarbeitung |
description |
Ice-thickness measurements in Antarctic ice-shelf grounding zones are necessary for calculating the mass balance of individual catchments, but remain poorly constrained for most of the continent. We describe a new inverse modelling optimization approach to estimate ice thickness in the grounding zone of Antarctic outlet glaciers and ice shelves using spatial patterns of tide-induced flexure derived from differential interferometric synthetic aperture radar (InSAR). We demonstrate that the illposedness of the inverse formulation of the elastic-plate equations for bending can be controlled by regularization. In one dimension, the model recreates smooth, synthesized profiles of ice thickness from flexure information to within 1–2%. We test the method in two dimensions and validate it in the grounding zone of Beardmore Glacier, a major outlet glacier in the Transantarctic Mountains, using interferograms created from TerraSAR-X satellite imagery acquired in 2012. We compare our results with historic and modern ice-thickness data (radio-echo sounding from 1967 and ground-penetrating radar from 2010). We match both longitudinal and transverse thickness transects to within 50m root mean-square error using an effective Young’s modulus of 1.4GPa. The highest accuracy is achieved close to the grounded ice boundary, where current estimates of thickness based on surface elevation measurements contain a systematic bias towards thicker ice. |
author2 |
Jacka, T. H. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Marsh, O.J. Rack, W. Golledge, N.R. Lawson, W. Floricioiu, Dana |
author_facet |
Marsh, O.J. Rack, W. Golledge, N.R. Lawson, W. Floricioiu, Dana |
author_sort |
Marsh, O.J. |
title |
Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending |
title_short |
Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending |
title_full |
Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending |
title_fullStr |
Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending |
title_full_unstemmed |
Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending |
title_sort |
grounding-zone ice thickness from insar: inverse modelling of tidal elastic bending |
publisher |
Cambridge University Press |
publishDate |
2014 |
url |
https://elib.dlr.de/92562/ http://www.igsoc.org/journal/60/221/ |
long_lat |
ENVELOPE(174.900,174.900,-83.350,-83.350) ENVELOPE(170.000,170.000,-84.500,-84.500) |
geographic |
Antarctic Transantarctic Mountains Beardmore Beardmore Glacier |
geographic_facet |
Antarctic Transantarctic Mountains Beardmore Beardmore Glacier |
genre |
Antarc* Antarctic Beardmore Glacier Ice Shelf Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctic Beardmore Glacier Ice Shelf Ice Shelves Journal of Glaciology |
op_relation |
Marsh, O.J. und Rack, W. und Golledge, N.R. und Lawson, W. und Floricioiu, Dana (2014) Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending. Journal of Glaciology, 60 (221), Seiten 526-536. Cambridge University Press. doi:10.3189/2014JoG13J033 <https://doi.org/10.3189/2014JoG13J033>. ISSN 0022-1430. |
op_doi |
https://doi.org/10.3189/2014JoG13J033 |
container_title |
Journal of Glaciology |
container_volume |
60 |
container_issue |
221 |
container_start_page |
526 |
op_container_end_page |
536 |
_version_ |
1766251117919862784 |