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Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending

Marsh, O.J. and Rack, W. and Golledge, N.R. and Lawson, W. and Floricioiu, Dana (2014) Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending. Journal of Glaciology, 60 (221), pp. 526-536. Cambridge University Press. doi: 10.3189/2014JoG13J033. ISSN 0022-1430.

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Official URL: http://www.igsoc.org/journal/60/221/


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.

Item URL in elib:https://elib.dlr.de/92562/
Document Type:Article
Title:Grounding-zone ice thickness from InSAR: inverse modelling of tidal elastic bending
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Marsh, O.J.Gateway Antarctica, University of Canterbury, Christchurch, New ZealandUNSPECIFIED
Rack, W.University of Canterbury, New ZealandUNSPECIFIED
Golledge, N.R.Antarctic Research Centre, Victoria University of Wellington, Wellington, New ZealandUNSPECIFIED
Lawson, W.Department of Geography, University of Canterbury, Christchurch, New ZealandUNSPECIFIED
Floricioiu, Danadana.floricioiu (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of Glaciology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.3189/2014JoG13J033
Page Range:pp. 526-536
EditorsEmailEditor's ORCID iD
Jacka, T. H.jglac@bigpond.comUNSPECIFIED
Publisher:Cambridge University Press
Keywords:Antarctic glaciology, glacier discharge, ice/ocean interactions, remote sensing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben hochauflösende Fernerkundungsverfahren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Floricioiu, Dr. Dana
Deposited On:27 Nov 2014 13:11
Last Modified:19 Nov 2021 20:49

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