Periglacial Landscape Evolution in Antarctic Lava Flows and Glacial Tills

Abstract: This project uses cosmogenic nuclide dating and LIDAR studies of surface roughness to understand weathering and landscape evolution in the Dry Valleys of Antarctica. The work focuses on two processes: cryoturbation of frozen soils and the development of patterned, frozen ground on ancient lava flows. The approach includes innovative uses of He3 profiling. Results will also be applied to understanding the glacial history of the Dry Valleys. There are potential applications to understanding the history of the East Antarctic Ice Sheet and the formation of Martian landscapes. The broader impacts include graduate student education. As well, the work may contribute to our understanding of the history of the Antarctic ice sheets, which is important to modeling their behavior during global climate change.摘要：本项目借助宇宙成因核素测年与地表粗糙度激光雷达（LIDAR）研究方法，解析南极干谷的风化作用与景观演化机制。研究聚焦两大核心过程：冻土的冻融扰动作用，以及古熔岩流上发育的图案化冻土。本研究创新性地应用了He-3剖面分析技术。研究成果可用于解析南极干谷的冰川演化历史，并有潜力助力理解东南极冰盖演化历程与火星地表的形成机制。本项目的拓展影响涵盖研究生人才培养；此外，相关研究可深化对南极冰盖演化的认知，这对模拟全球气候变化背景下冰盖的动态行为具有重要意义。