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.

智力价值：PI 提议继续并扩展 ANET-POLENET 第 2 阶段的 GPS 和地震，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 科学主题包括：1）确定自末次盛冰期以来的冰质量变化，包括现代冰质量平衡； 2）固体地球对冰盖动力学的影响； 3）西南极洲的构造演化及其对冰盖演化的反馈。将与英国和意大利合作伙伴合作部署的九个新远程连续 GPS 站将增强第一阶段部署的 ANET-POLENET 仪器。选址旨在更好地限制 GIA 模型预测和第一阶段结果表明的隆起中心。 ANET-POLENET 第 2 阶段建立在第 1 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伏地幔高度不均匀的热和粘度结构； 2）新发现的板内冰川、火山和构造地震过程； 3）改进了对板内垂直和水平地壳运动的估计以及南极GPS参考系的细化； 4）阐明由于地球结构横向变化而对冰川均衡调整引起的地壳运动的控制。 PI 提出了一项名义上的计划，即在该项目的最后 2 年将 ANET 减少大约一半，形成一个长期的社区“骨干网络”。更广泛的影响：利用原位 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，将有助于加深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了解。由骨干 ANET-POLENET 网络收集的地震和大地测量数据向科学界开放。 ANET-POLENET 是开发和实现偏远极地仪器全年运行的技术和后勤创新不可或缺的一部分，有助于推进对极地地区的科学和地理广泛研究。 ANET-POLENET 团队将建立一项培训计划，指导年轻的极地科学家进行复杂、多学科和国际合作的研究。 ANET-POLENET 将通过 pollet.org 网站、大学讲座和 K-12 学校参观，继续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。