Rutford Ice Stream Cooperative Research Program with British Antarctic Survey

拉特福德冰流与英国南极调查局的合作研究项目

• 批准号: 1643961
• 负责人: Sridhar Anandakrishnan
• 金额: $ 14.25万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-07-01 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1643961&HistoricalAwards=false
• 关键词: Rutford; Ice; Stream; Cooperative; Research

Anandakrishnan/1643961This award supports a project to study conditions under the Rutford Ice Stream, a large glacier that flows from the interior of the West Antarctic Ice Sheet to the Filchner Ronne Ice Shelf and then on to the ocean. The speed and volume of ice delivered to the ocean by this and similar glaciers is central to the question of sea-level change in the coming decades: if the volume of ice carried by Rutford to the ocean increases, then it will contribute to a rise in sea level. Numerical models of glacier flow that are used to forecast future conditions must include a component that accounts for the sliding of the ice over its bed. The sliding process is poorly modeled because of lack of detailed information about the bottom of glaciers, leading to increased uncertainty in the ice-flow models. Data from this project will provide such information. During this project, in collaboration with researchers at the British Antarctic Survey, a detailed survey of the properties of the bed of Rutford Ice Stream will be carried out. These surveys include using seismic instruments (which are sensitive to naturally occurring earthquakes within glaciers--called icequakes) to monitor the distribution of those icequakes at the bed. The locations, size, and timing of icequakes are controlled by the properties of the bed such as porosity, water pressure, and stress. As part of this project, a hole will be drilled to the bed of the glacier to monitor water pressures and to extract a sample of the basal material. By comparing the pressure variations with icequake production, the properties of the basal material over a large area can be better determined. Those results will aid in the application of numerical models by informing their description of the sliding process. This award requires field work in Antarctica.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

Anandakrishnan/1643961这项奖项支持一个项目，以研究Rutford Ice流下的条件，Rutford Ice流是一个大型冰川，该冰川从南极冰盖的内部流到了Filchner Ronne Ice架，然后转到海洋。 通过这种和类似的冰川传递到海洋的冰的速度和数量对于未来几十年的海平面变化问题至关重要：如果鲁特福德（Rutford）向海洋携带的冰量增加，那么它将导致海平面上升。用于预测未来条件的冰川流量的数值模型必须包括一个组件，该组件可以说明冰在其床上的滑动。 由于缺乏有关冰川底部的详细信息，因此滑动过程的建模很差，导致冰流模型的不确定性增加。该项目的数据将提供此类信息。在该项目中，将与英国南极调查的研究人员合作，将对鲁特福德冰流的床的特性进行详细的调查。 这些调查包括使用地震仪器（对冰川冰川中发生的自然发生地震敏感）来监测床上这些冰原的分布。 冰川的位置，大小和时机受床的特性（例如孔隙率，水压和压力）控制。 作为该项目的一部分，将在冰川的床上钻一个孔，以监测水压并提取基础材料的样品。 通过将压力变化与冰原的产生进行比较，可以更好地确定基底材料在大面积上的特性。 这些结果将通过告知其对滑动过程的描述来帮助应用数值模型。该奖项要求在南极洲进行现场工作。该奖项反映了NSF的法定任务，并被认为是使用基金会的知识分子优点和更广泛影响评论标准的评估值得支持的。

项目成果

Not all Icequakes are Created Equal: Basal Icequakes Suggest Diverse Bed Deformation Mechanisms at Rutford Ice Stream, West Antarctica

并非所有冰震都是一样的：基底冰震表明南极洲西部拉特福德冰流的床变形机制多种多样

• DOI: 10.1029/2020jf006001
• 发表时间: 2021
• 期刊: Journal of Geophysical Research: Earth Surface
• 作者: Kufner, Sofia‐Katerina;Brisbourne, Alex M.;Smith, Andrew M.;Hudson, Thomas S.;Murray, Tavi;Schlegel, Rebecca;Kendall, John M.;Anandakrishnan, Sridhar;Lee, Ian
• 通讯作者: Lee, Ian