气候变化领域集成服务门户(CCPortal): Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf

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DOI	10.5194/tc-11-2481-2017
	Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf
	Rack W.; King M.A.; Marsh O.J.; Wild C.T.; Floricioiu D.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	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 60ĝ€% 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. © Author(s) 2017.
学科领域	amplitude; boundary condition; digital elevation model; displacement; elevation; field method; GPS; grounding line; ice shelf; ice thickness; radar interferometry; satellite data; synthetic aperture radar; TerraSAR-X; velocity; vertical movement; Antarctica; East Antarctica; McMurdo Ice Shelf
语种	英语
scopus关键词	amplitude; boundary condition; digital elevation model; displacement; elevation; field method; GPS; grounding line; ice shelf; ice thickness; radar interferometry; satellite data; synthetic aperture radar; TerraSAR-X; velocity; vertical movement; Antarctica; East Antarctica; McMurdo Ice Shelf
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119315
作者单位	Gateway Antarctica, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; School of Land and Food, University of Tasmania, Private Bag 76, Hobart, 7001, Australia; Earth Observation Center, German Aerospace Center (DLR) Oberpfaffenhofen, Wessling, 82234, Germany
推荐引用方式 GB/T 7714	Rack W.,King M.A.,Marsh O.J.,et al. Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf[J],2017,11(6).
APA	Rack W.,King M.A.,Marsh O.J.,Wild C.T.,&Floricioiu D..(2017).Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf.Cryosphere,11(6).
MLA	Rack W.,et al."Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf".Cryosphere 11.6(2017).