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

为了解南极西部冰盖质量随时间的变化规律，本项目在南极西部建立了由GPS和地震台站组成的POLENET网络。这些信息最终被用于预测伴随全球变暖而来的海平面上升，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，而地震台站则表征冰/岩石界面、岩石圈和地幔的物理性质。结合卫星数据，这个项目提供了一个更完整的冰盖的现状，它在不久的将来可能发生的变化，以及它在最后一次冰川极大期的总体规模。这些数据还将用于推断亚冰盖地质和陆地热通量，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层内部和地核的层析成像模型，因为它位于地球仪器匮乏的南半球。这个项目的广泛影响是多方面的。这项工作对提高我们对全球变暖对海平面上升影响的理解具有重要意义。它还支持博士后、研究生和本科水平的教育，并向在科学领域未被充分代表的群体伸出援手。作为对国际极地年的贡献，该项目建立了极地测量基础设施的遗产。它还涉及24个国家的国际合作。欲了解更多信息，请参阅IPY.org上的IPY项目#185。美国国家科学基金会（NSF）正在支持一个互补的北极POLENET阵列，该阵列正在格陵兰岛建造，根据NSF奖编号0632320。

Abstract 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. 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.