DOI: 10.5194/tc-11-2481-2017
Scopus记录号: 2-s2.0-85032988274
论文题名: Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf
作者: Rack W ; , King M ; A ; , Marsh O ; J ; , Wild C ; T ; , Floricioiu D
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 6 起始页码: 2481
结束页码: 2490
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75484
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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, Australia; Earth Observation Center, German Aerospace Center (DLR) Oberpfaffenhofen, Wessling, Germany
Recommended Citation:
Rack W,, King M,A,et al. Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf[J]. Cryosphere,2017-01-01,11(6)