Collaborative Research: Anisotropy, Abrupt Climate Change, and the Deep Ice in West Antarctica

该奖项支持一个项目，该项目使用垂直速度剖面来限制simple Dome的积累速率、厚度和温度历史，该剖面包括随着时间的推移而变化的织物对变形的影响，通过声波速度测量和在simple Dome薄片中观察到的晶粒尺寸来反演织物的深度剖面，以了解过去表面温度和积累速率的变化。重点分析了22ka和15ka的明显气候突变事件。这项工作的智力价值在于，它将使用耦合结构演化和冰盖流动模型从深冰的许多物理特性中提取过去的气候信息。重点将放在simple Dome的深层冰河时代冰层上，那里的冰芯记录显示了令人困惑的信号，那里的建模结果暗示了有趣的变形模式。该方法还将应用于伯德站和泰勒多姆的记录，最终形成未来对南极西部分界线核心分析的基础。该项目的更广泛影响是，它最终将有助于我们了解各向异性对南极洲西部冰流动力学的影响。这将有助于我们理解冰流与冰芯中古气候记录之间的联系，特别是关于化学记录与冰变形之间的关系。这将有助于建立一个新的冰流模型，该模型考虑了各向异性和结构演化的影响。该项目还将促进一名新的年轻女性研究者的职业发展，并将支持几名研究生。最后，这项工作将通过直接帮助支持“冰上女孩”项目来鼓励物理科学的多样性，该项目鼓励年轻女性探索科学和自然世界。

This award supports a project to constrain the accumulation rate, thickness, and temperature history for Siple Dome using a vertical velocity profile that includes the effects of an evolving fabric on deformation through time, to invert the depth-profile of fabric determined from sonic velocity measurements and grain size observed in thin sections in Siple Dome for the surface temperature and accumulation rate changes in the past, focusing on the apparent abrupt climate change events at 22ka and 15ka. The intellectual merit of the work is that it will extract past climate information from a number of physical properties of the deep ice using a coupled fabric evolution and ice-sheet flow model. The focus will be on the deep ice-age ice at Siple Dome, where the ice-core record shows puzzling signals and where modeling results imply intriguing deformation patterns. The method will also be applied to the records from Byrd Station and Taylor Dome to ultimately form a basis for future analysis of the West Antarctic Divide core. The broader impacts of the project are that it will ultimately contribute to our understanding of the effects of anisotropy on ice flow dynamics in West Antarctica. It will contribute to our understanding of the connection between ice flow and the paleoclimate record in ice cores, particularly with respect to the relationship between the chemical record and ice deformation. And it will contribute a new ice-flow model that includes the effects of anisotropy and fabric evolution. The project will also contribute to advancing the career of a new, young, female investigator and will support a couple of graduate students. Finally, the work will encouraging diversity in the physical sciences by directly helping to support the Girls on Ice a program that encourages young women to explore science and the natural world.