Strategies for High Precision Processing of GPS Measurements with Application to the Amery Ice Shelf, East Antarctica
Strategies for High Precision Processing of GPS Measurements with Application to the Amery Ice Shelf, East Antarctica
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DOI：
10.1007/pl00012824
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发表时间：
2000-07
期刊：
影响因子：
4.9
通讯作者：
Matt A. King;L. N. Nguyen;R. Coleman;P. Morgan
中科院分区：
文献类型：
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作者：
Matt A. King;L. N. Nguyen;R. Coleman;P. Morgan
作为正在进行的旨在调查冰架动态、接地区定义和冰架应变的冰川学研究的一部分，已经在浮动的南极冰架阿默里冰架上进行了许多统计全球定位系统（GPS）测量活动。这些研究对于提高对南极冰盖质量平衡和冰盖/海洋相互作用动力学模型的了解至关重要。本文介绍了两种用于处理统计 GPS 数据的技术。一种方法使用经典静态方法的分段版本，另一种方法采用新的顺序处理技术。两种方法对于站坐标都产生相似的结果，并证明了 GPS 在提取冰架上的潮汐信号并提供有关冰盖动态运动的信息方面的潜力。为了验证垂直分量的结果，我们将冰架 GPS 潮汐信号与从附近 Beaver Lake 潮汐计测量得出的潮汐模型进行了比较。 GPS 结果与潮汐模型的比较在几厘米水平上给出了良好的振幅一致性（GPS 结果总是较大），但清楚地显示了冰架下海洋潮汐波的相位传播的证据。提高冰架上潮汐的分辨率将对未来的卫星任务（例如冰、云和陆地高程卫星（ICESAT））带来巨大好处，并且 GPS 和卫星数据的综合使用将是任何正在进行的南极冰盖质量平衡研究的基础。 © 2000 约翰威利父子公司。
A number of statistic Global Positioning System (GPS) measurement campaigns have been made on a floating Antarctic ice shelf, the Amery Ice Shelf, as part of ongoing glaciological studies designed to investigate the ice shelf dynamics, grounding zone definition, and ice shelf strain. Such studies ar fundamental to improving out knowledge of the Antarctic ice-sheet mass balance and dynamical models of ice sheet/ocean interaction. This article describes two techniques used to process the statistic GPS data. One approach uses a segmented version of the classical static methodology, and the other approach adopts a new sequential processing technique. Both approaches yield similar results for the station coordinates and demonstrate the potential of GPS for extracting the tidal signal on the ice shelves and giving information on the dynamical motion of the ice sheet. To verify our results for the vertical component, we compare the ice shelf GPS tidal signal with a tidal model derived from tide gauge measurements at nearby Beaver Lake. Comparison of the GPS results with the tide model give good agreement in amplitude at the few cm level (GPS results always larger) but clearly shows evidence of phase propagation of the ocean tidal wave under the ice shelf. Improving the resolution of the tides over the ice shelves will be of tremendous benefit for future satellite missions, such as Ice, Cloud and Land Elevation Satellite (ICESAT), and the integrated use of GPS and satellite data will be fundamental for any on-going Antarctic ice sheet mass balance studies. © 2000 John Wiley & Sons, Inc.