Investigating (Un)Stable Sliding of Whillians Ice Stream and Subglacial Water Dynamics Using Borehole Seismology: A Proposed Component of WISSARD

使用钻孔地震学研究 Whillians 冰流的（不稳定）滑动和冰下水动力学： WISSARD 的拟议组成部分

• 批准号: 1043784
• 负责人: Susan Schwartz
• 金额: $ 65.02万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1043784&HistoricalAwards=false
• 关键词: Investigating; Un; Stable; Sliding; Whillians

This award provides support for "Investigating (Un)Stable Sliding of Whillans Ice Stream and Subglacial Water Dynamics Using Borehole Seismology: A proposed Component of the Whillans Ice Stream Subglacial Access and Research Drilling" from the Antarctic Integrated Systems Science (AISS) program in the Office of Polar Programs at NSF. The project will use the sounds naturally produced by the ice and subglacial water to understand the glacial dynamics of the Whillans Ice Stream located adjacent to the Ross Ice Shelf in Antarctica.Intellectual Merit: The transformative component of the project is that in addition to passive surface seismometers, the team will deploy a series of borehole seismometers. Englacial placement of the seismometers has not been done before, but is predicted to provide much better resolution (detection of smaller scale events as well as detection of a much wider range of frequencies) of the subglacial dynamics. In conjunction with the concurrent WISSARD (Whillans Ice Stream Subglacial Access and Research Drilling) project the team will be able to tie subglacial processes to temporal variations in ice stream dynamics and mass balance of the ice stream. The Whillans Ice Stream experiences large changes in ice velocity in response to tidally triggered stick-slip cycles as well as periodic filling and draining of subglacial Lake Whillans. The overall science goals include: improved understanding of basal sliding processes and role of sticky spots, subglacial lake hydrology, and dynamics of small earthquakes and seismic properties of ice and firn.Broader Impact: Taken together, the research proposed here will provide information on basal controls of fast ice motion which has been recognized by the IPCC as necessary to make reliable predictions of future global sea-level rise. The information collected will therefore have broader implications for global society. The collected information will also be relevant to a better understanding of earthquakes. For outreach the project will work with the overall WISSARD outreach coordinator to deliver information to three audiences: the general public, middle school teachers, and middle school students. The project also provides funding for training of graduate students, and includes a female principal investigator.

该奖项为NSF极地项目办公室南极综合系统科学（AISS）项目的“使用钻孔地震学调查Whillans冰流和冰下水动力学的（非）稳定滑动：Whillans冰流冰下访问和研究钻探的拟议组成部分”提供支持。该项目将利用冰和冰下水自然产生的声音来了解位于南极洲罗斯冰架附近的Whillans冰流的冰川动力学。智力优势：该项目的变革性组成部分是，除了被动地表地震仪外，该团队还将部署一系列钻孔地震仪。 以前从未在冰川期放置过地震仪，但据预测，这将为冰下动力学提供更好的分辨率（检测较小规模的事件以及检测更广泛的频率范围）。结合同时进行的WISSARD（Whillans Ice Stream Subglacial Access and Research Drilling）项目，该团队将能够将冰下过程与冰流动力学和冰流质量平衡的时间变化联系起来。Whillans冰流经历了巨大的变化，在响应潮汐触发粘滑周期以及冰下湖Whillans定期填充和排水的冰速度。总体科学目标包括：提高认识的基础滑动过程和作用的粘点，冰下湖泊水文学，和动态的小地震和地震性质的冰和firn.Broader的影响：总的来说，这里提出的研究将提供信息的基础控制快速冰运动已被公认为必要的IPCC作出可靠的预测，未来的全球海平面上升。 因此，所收集的信息将对全球社会产生更广泛的影响。 收集的信息也将有助于更好地了解地震。在推广方面，该项目将与WISSARD的总体推广协调员合作，向三个受众提供信息：公众、中学教师和中学生。该项目还为培训研究生提供资金，并包括一名女性首席调查员。