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

该奖项为“利用钻孔地震学研究惠兰斯冰流（非）稳定滑动和冰下水动力学：惠兰斯冰流冰下通道和研究钻探的提议组成部分”提供支持，该项目来自美国国家科学基金会极地项目办公室的南极综合系统科学（AISS）项目。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惠兰斯冰流的冰川动力学。知识价值：该项目的革命性组成部分是，除了被动式地面地震仪外，该团队还将部署一系列井眼地震仪。在英格兰地区放置地震仪以前从未做过，但预计将提供更好的冰川下动力学分辨率（探测较小规模的事件以及探测更广泛的频率范围）。与同时进行的WISSARD（惠兰斯冰流冰下通道和研究钻探）项目相结合，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冰流经历了巨大的冰速变化，以响应潮汐触发的粘滑循环以及冰下湖Whillans的周期性填充和排水。总体科学目标包括：提高对基础滑动过程和粘点作用的理解，冰下湖泊水文，小地震动力学和冰和雪的地震特性。更广泛的影响：综合起来，这里提出的研究将提供关于快速冰运动的基本控制的信息，这已被IPCC认为是对未来全球海平面上升作出可靠预测所必需的。因此，所收集的信息将对全球社会产生更广泛的影响。收集到的信息也将有助于更好地了解地震。在外联方面，该项目将与WISSARD外联协调员合作，向三种受众提供信息：普通公众、中学教师和中学生。该项目还为研究生培训提供资金，并包括一名女首席研究员。

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.