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: 1249602
• 负责人: Richard Aster
• 金额: $ 36.77万
• 依托单位: New Mexico Institute of Mining and Technology
• 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 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1249602&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：研究所建议继续并扩大ANET-POLENET第二阶段的全球定位系统和地震系统，以增进对地球动力学过程及其对南极西部冰盖影响的了解。ANET-POLENET的科学主题包括：1）确定自末次盛冰期以来的冰量变化，包括现代冰量平衡; 2）固体地球对冰盖动力学的影响; 3）西南极洲的构造演化和冰盖演化的反馈。九个新的远程连续GPS站，将与英国合作部署。和意大利合作伙伴，将增加在第一阶段部署的ANET-POLENET仪器。选址的目的是更好地约束隆起中心预测的GIA模型和第一阶段的结果表明。ANET-POLENET第二阶段建立在第一阶段的科学、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的高度不均匀的热和粘性结构; 2）新发现的板内冰川、火山和构造孕震过程; 3）改进了对板内地壳垂直和水平运动的估计，并改进了南极GPS参考框架; 4）阐明了由于横向变化的地球结构对冰川均衡调整引起的地壳运动的控制。PI提出了一个名义上的计划，在该项目的最后2年将ANET减少约一半，成为一个长期的社区“骨干网络”。更广泛的影响：使用现场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，将有助于更好地了解南极冰盖如何应对全球变暖，以及这种反应如何影响海平面和其他全球变化。科学界可公开获取由ANET-POLENET主干网络收集的地震和大地测量数据。ANET-POLENET是开发和实现技术和后勤创新的组成部分，用于在偏远的极地站点全年运行仪器，帮助推进极地地区的科学和地理广泛研究。ANET-POLENET团队将建立一个培训计划，指导年轻的极地科学家进行复杂的、多学科的和国际合作的研究。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。