Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf
Analysis of ice shelf flexure and its InSAR representation in the grounding zone of the southern McMurdo Ice Shelf
复制标题
麦克默多冰架南部接地区冰架弯曲分析及其 InSAR 表征
DOI：
10.5194/tc-11-2481-2017
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
D. Floricioiu
中科院分区：
文献类型：
--
作者：
W. Rack;Matt A. King;O. Marsh;C. Wild;D. Floricioiu
抽象的。我们研究潮汐弯曲的接地区的麦克默多冰架，南极洲，结合TerraSAR-X重复通过雷达干涉测量，精确的数字高程模型，和GPS地面验证数据。2014年10月至12月期间同时获取了卫星和实地数据。我们的GPS数据显示，在距离接地线几公里的潮汐周期内，垂直位移幅度的水平调制高达60%。我们归因于所观察到的振荡水平运动变化的弯曲应力和帐户，它使用一个简单的弹性梁模型。从九幅差分干涉图中去除水平表面应变，得到精确的弯曲曲线。他们揭示了一个固定的（而不是潮汐迁移）接地线的位置，并消除了显着的上游弯曲在这个位置的可能性。由于干涉测量数据中未校正的水平应变而造成的明显垂直运动的后果是干涉测量地线的系统性错位，错位程度可达一个冰厚或几百米。虽然我们的现场选址是由于其简单的边界条件和低背景速度，我们的研究结果是相关的卫星干涉测量研究的其他接地区，特别是研究潮汐引起的速度变化或解释基于卫星的弯曲配置文件。
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.
影响因子：
5.2
作者：
Bindschadler, R.;Choi, H.;Young, N.
通讯作者：
Young, N.