"Collaborative Research: IPY: POLENET-Antarctica: Investigating Links between Geodynamics and Ice Sheets"

该项目在西南极建立了一个由GPS和地震站组成的POLENET网络，以了解西南极冰盖(WAIS)的质量是如何随时间变化的。这些信息最终被用来预测伴随全球变暖的海平面上升，并解释气候变化记录。GPS(全球定位系统)台站测量基岩的垂直和水平运动，而地震台则表征冰/岩石界面、岩石圈和地幔的物理性质。结合卫星数据，该项目提供了关于冰盖的当前状态、在不久的将来可能发生的变化以及上一次冰川盛期期间的整体大小的更完整的图景。这些数据还将用于推断次冰盖地质学和陆地热通量，这是冰川运动模型的关键输入。此外，该项目还改进了地球深部和核心的断层成像模型，因为它位于地球仪器设备落后的南半球。该奖项支持对甘布尔采夫冰下山脉(GSM)的地震学研究，甘布尔采夫冰下山脉是一个埋在东南极冰盖下的德克萨斯州大小的山脉。该项目将进行被动地震实验，在GSM上部署23个地震台，以表征地壳和上地幔的结构，并确定驱动隆起的过程。研究结果还将限制地面热通量，这是模拟冰盖形成和行为的关键变量。GSM几乎没有被开发过，它代表了地球上最大的未被研究的地壳隆起区域。此外，该地区也是南极冰盖生长的起点。由于这些悬而未决的问题，全球定位系统已被国际南极科学界确定为国际极地年(2007-2009年)的研究重点。除了这项地震实验，美国国家科学基金会还支持对全球移动通信系统进行的航空地球物理调查，获奖编号为0632292。该项目的主要国际合作伙伴包括德国、中国、澳大利亚和英国。有关更多信息，请参见IPY.org上的IPY项目#67。在更广泛的影响方面，该项目还支持博士后和研究生研究以及各种形式的外联活动。该项目的更广泛影响是多种多样的。这项工作对于提高我们对全球变暖对海平面上升影响的理解具有重要的社会意义。它还支持博士后、研究生和本科生水平的教育，并向在科学界代表性不足的群体提供服务。作为对国际极地年的贡献，该项目为极地测量建立了基础设施遗产。它还涉及24个国家的国际合作。有关更多信息，请参见IPY.org上的IPY项目#185。国家科学基金会正在支持在格陵兰岛建造一个互补的北极POLENET阵列，该阵列由国家科学基金会颁发#0632320奖。

This project constructs POLENET a network of GPS and seismic stations in West Antarctica to understand how the mass of the West Antarctic ice sheet (WAIS) changes with time. The information is ultimately used to predict sea level rise accompanying global warming and interpret climate change records. The GPS (global positioning system) stations measure vertical and horizontal movements of bedrock, while the seismic stations characterize physical properties of the ice/rock interface, lithosphere, and mantle. Combined with satellite data, this project offers a more complete picture of the ice sheet's current state, its likely change in the near future, and its overall size during the last glacial maximum. This data will also be used to infer sub-ice sheet geology and the terrestrial heat flux, critical inputs to models of glacier movement. As well, this project improves tomographic models of the earth's deep interior and core through its location in the Earth's poorly instrumented southern hemisphere. Abstract This award supports a seismological study of the Gamburtsev Subglacial Mountains (GSM), a Texas-sized mountain range buried beneath the ice sheets of East Antarctica. The project will perform a passive seismic experiment deploying twenty-three seismic stations over the GSM to characterize the structure of the crust and upper mantle, and determine the processes driving uplift. The outcomes will also offer constraints on the terrestrial heat flux, a key variable in modeling ice sheet formation and behavior. Virtually unexplored, the GSM represents the largest unstudied area of crustal uplift on earth. As well, the region is the starting point for growth of the Antarctic ice sheets. Because of these outstanding questions, the GSM has been identified by the international Antarctic science community as a research focus for the International Polar Year (2007-2009). In addition to this seismic experiment, NSF is also supporting an aerogeophysical survey of the GSM under award number 0632292. Major international partners in the project include Germany, China, Australia, and the United Kingdom. For more information see IPY Project #67 at IPY.org. In terms of broader impacts, this project also supports postdoctoral and graduate student research, and various forms of outreach. Broader impacts of this project are varied. The work is relevant to society for improving our understanding of the impacts of global warming on sea level rise. It also supports education at the postdoctoral, graduate, and undergraduate levels, and outreach to groups underrepresented in the sciences. As an International Polar Year contribution, this project establishes a legacy of infrastructure for polar measurements. It also involves an international collaboration of twenty four countries. For more information see IPY Project #185 at IPY.org. NSF is supporting a complementary Arctic POLENET array being constructed in Greenland under NSF Award #0632320.