Global Positioning System Measurements of Crustal Motion in Antarctica

9909467雷蒙德该奖项由极地方案办公室南极地质和地球物理方案提供，为继续与NASA合作在南极洲开发自主的、连续运行的全球定位系统(GPS)站提供资金。该项目来年的目标是维持现有两个自主GPS站的运作，进一步开发这些站的电力和电子系统，并分析和公布现有数据。横贯北极山脉()连续全球定位系统的目的是测量冰川均衡、粘弹性和弹性对近期冰块变化的响应以及构造力产生的垂直和水平位移分量。该阵列将对冰川后反弹模型提供关键的独立约束，这反过来将改善未来卫星任务对当今冰质量平衡的估计。其中包括重力恢复和大气变化实验(GRACE)卫星对卫星跟踪重力飞行任务，以及冰、云和陆地高程卫星(ICESat)飞行任务将利用地球科学激光高度计系统对冰盖地形进行重复测量。在接下来的一年里，我们建议：(1)通过进行必要的维修和维护来维持这两个站的运营；(2)在麦克默多发射站的风力发电机试验场进行维护；(3)对垂直轴风力涡轮机进行静态和动态有限元分析(FEA)(与目前部署在Mt Coates的相同)，并将其纳入系统测试台，以便在环境和液氮温度下进行端到端系统测试。有限元分析将揭示涡轮机的预期故障模式，使我们能够更好地了解机组对预期恶劣条件的适应性，并指导可能在极端条件(风速超过150英里/小时[66米/S])下改进设计的设计修改。最后，我们将进行进一步深入的数据分析，以评估我们的两个站点和其他永久GPS站点的结果，根据现有的冰川后反弹导致南极板块变形的预测。

9909467RaymondThis award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, provides funds for continuation of an effort, in collaboration with NASA, to develop autonomous, continuously operating Global Positioning System (GPS) stations in Antarctica. The objectives of the project for the coming year are to maintain operations at the two existing autonomous GPS stations, carry out further development work on the power and electronics systems for the stations, and analyze and publish existing data. The purpose of the Transantarctic Mountains (TAM) continuous GPS array is to measure vertical and horizontal displacement components resulting from glacial isostasy, viscoelastic, and elastic response to recent ice mass changes, and tectonic forces. The array will provide critical independent constraints on post-glacial rebound models, which in turn will improve the estimate of present-day ice mass balance from future satellite missions. These include the Gravity Recovery and Atmospheric Change Experiment (GRACE) dual satellite-to-satellite tracking gravity mission, and repeated measurements of the topography of the ice sheet to be made using the Geoscience Laser Altimeter System (GLAS) by the Ice, Cloud and land Elevation Satellite (ICESat) mission. During the next year, we propose to: (1) maintain operations at these two stations, by performing necessary repairs and maintenance; (2) perform maintenance at the wind generator test site at the McMurdo Transmitter Site; (3) perform static and dynamic finite element analysis (FEA) of a vertical axis wind turbine (same as is currently deployed at Mt Coates), and incorporate it into a system test-bed for end-to-end system testing at ambient and liquid nitrogen temperatures. The FEA will reveal the expected failure modes of the turbine to allow us to better understand the suitability of the unit to the harsh conditions expected, and also guide design modifications that may improve the design for the extreme conditions (winds in excess of 150 mph [66 m/s]). Finally, we will perform further in-depth data analysis to evaluate the results of our two sites and other permanent GPS sites in terms of existing predictions of post-glacial rebound induced deformation of the Antarctic plate.