Collaborative Research: POLENET-Antarctica: Investigating Links Between Geodynamics and Ice Sheets - Phase 2

合作研究：POLENET-南极洲：调查地球动力学和冰盖之间的联系 - 第二阶段

• 批准号: 1249513
• 负责人: Ian Dalziel
• 金额: $ 29.12万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1249513&HistoricalAwards=false
• 关键词: Collaborative; Research; POLENET; Antarctica; Investigating

Intellectual Merit: The PIs propose to continue and expand GPS and seismic for ANET-POLENET Phase 2 to advance understanding of geodynamic processes and their influence on the West Antarctic Ice Sheet. ANET-POLENET science themes include: 1) determining ice mass change since the last glacial maximum, including modern ice mass balance; 2) solid earth influence on ice sheet dynamics; and 3) tectonic evolution of West Antarctica and feedbacks with ice sheet evolution. Nine new remote continuous GPS stations, to be deployed in collaboration with U.K. and Italian partners, will augment ANET-POLENET instrumentation deployed during Phase 1. Siting is designed to better constrain uplift centers predicted by GIA models and indicated by Phase 1 results. ANET-POLENET Phase 2 builds on Phase 1 scientific, technological, and logistical achievements including 1) seismic images of crust and mantle structure that resolve the highly heterogeneous thermal and viscosity structure of the Antarctic lithosphere and underlying mantle; 2) newly identified intraplate glacial, volcanic, and tectonic seismogenic processes; 3) improved estimates of intraplate vertical and horizontal crustal motions and refinement of the Antarctic GPS reference frame; and 4) elucidation of controls on glacial isostatic adjustment-induced crustal motions due to laterally varying earth structure. The PIs present a nominal plan to reduce ANET by approximately half to a longer-term community "backbone network" in the final 2 years of this project. Broader impacts: Monitoring and understanding mass change and dynamic behavior of the Antarctic ice sheet using in situ GPS and seismological studies will help improve understanding of how Antarctic ice sheets respond to a warming world and how will this response impacts sea-level and other global changes. Seismic and geodetic data collected by the backbone ANET-POLENET network are openly available to the scientific community. ANET-POLENET is integral in the development and realization of technological and logistical innovations for year-round operation of instrumentation at remote polar sites, helping to advance scientifically and geographically broad studies of the polar regions. The ANET-POLENET team will establish a training initiative to mentor young polar scientists in complex, multidisciplinary and internationally collaborative research. ANET-POLENET will continue the broad public outreach to the public about polar science through the polenet.org website, university lectures, and K-12 school visits. This research involves multiple international partners.

智力优势：私营部门建议继续和扩大ANET-POLENET第二阶段的GPS和地震，以促进对地球动力学过程及其对西南极冰盖的影响的了解。ANET-POLENET的科学主题包括：1)确定自上一次冰盛期以来的冰量变化，包括现代冰块平衡；2)固体地球对冰盖动力学的影响；3)南极洲西部的构造演化和冰盖演化的反馈。九个新的远程连续GPS站将与英国和意大利合作伙伴合作部署，将加强在第一阶段部署的ANET-POLENET仪器。SITING旨在更好地约束GIA模型预测和第一阶段结果表明的隆起中心。ANET-POLENET第二阶段建立在第一阶段科学、技术和后勤成果的基础上，包括1)地壳和地幔结构的地震图像，解决了南极岩石圈和下地幔高度不均匀的热和粘性结构；2)新发现的板内冰川、火山和构造地震孕育过程；3)改进了对板内垂直和水平地壳运动的估计，并改进了南极GPS参考框架；以及4)阐明了由于地球结构的横向变化而对冰川均衡调整引起的地壳运动的控制。PIS提出了一个名义上的计划，在这个项目的最后两年将ANET减少大约一半，以建立一个更长期的社区“骨干网络”。更广泛的影响：利用现场GPS和地震学研究监测和了解南极冰盖的质量变化和动态行为，将有助于增进对南极冰盖如何应对全球变暖以及这种反应将如何影响海平面和其他全球变化的理解。科学界可以公开获得由ANET-POLENET主干网络收集的地震和大地测量数据。ANET-POLENET在开发和实现技术和后勤创新方面是不可或缺的，以便在偏远的极地地点全年运行仪器，帮助从科学和地理角度推进对极地地区的广泛研究。ANET-POLENET团队将建立一个培训计划，在复杂的、多学科的和国际合作的研究中指导年轻的极地科学家。ANET-POLENET将继续通过polenet.org网站、大学讲座和K-12学校访问向公众广泛宣传极地科学。这项研究涉及多个国际合作伙伴。