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Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf

Rack, W. and King, Matt and Marsh, O.J. and Wild, Christian T. and 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), pp. 2481-2490. Copernicus Publications. DOI: 10.5194/tc-11-2481-2017 ISSN 1994-0416

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Official URL: https://www.the-cryosphere.net/11/2481/2017/tc-11-2481-2017.html

Abstract

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.

Item URL in elib:https://elib.dlr.de/116383/
Document Type:Article
Title:Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rack, W.gateway antarctica, university of canterbury, christchurch, new zealandUNSPECIFIED
King, MattUniversity of Tasmania, Hobart, AustraliaUNSPECIFIED
Marsh, O.J.gateway antarctica, university of canterbury, christchurch, new zealandUNSPECIFIED
Wild, Christian T.University of Canterbury, New ZealandUNSPECIFIED
Floricioiu, Danadana.floricioiu (at) dlr.dehttps://orcid.org/0000-0002-1647-7191
Date:3 November 2017
Journal or Publication Title:The Cryosphere
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.5194/tc-11-2481-2017
Page Range:pp. 2481-2490
Publisher:Copernicus Publications
ISSN:1994-0416
Status:Published
Keywords:InSAR, ice shelf, Antarctica, grounding zone
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - SAR-Methodology
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Floricioiu, Dr. Dana
Deposited On:04 Dec 2017 11:36
Last Modified:09 Jan 2019 12:23

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