Collaborative Research: West Antarctic Ice Sheet stability, Alpine Glaciation, and Climate Variability: a Terrestrial Perspective from Cosmogenic-nuclide Dating in McMurdo Sound

知识价值：PIs建议用一个陆地项目来补充ANDRILL的海洋记录，该项目将对南极西部冰盖（WAIS）和麦克默多湾高山冰川过去的波动提供时间上的控制。该项目将为麦克默多湾岛屿和半岛上的陆基海洋冰和高山冰川沉积的漂流物绘制高分辨率地图。此外，pi将获得这些已绘制的漂流板和高山冰碛的多碎屑/多核素宇宙成因分析，并使用区域气候模型来阐明麦克默多地区在地面冰扩张和消退期间可能的环境条件范围。pi将利用保存在发现山、黑岛和布朗半岛两侧的冰原和高山冰川波动的地质记录。陆基海冰沉积的漂流物将对西海冰川以前的前进和后退产生空间限制。来自高山冰川的冰碛，被假设为间冰期起源，可以提供该地区水文变化的一级记录。综合现场数据，该团队建议提高罗斯海湾现有区域尺度气候模型的分辨率。总的办法和预期的结果将为把南极洲这一关键地区的海洋和陆地记录联系起来迈出第一步。更广泛的影响：拟议工作的结果将与波士顿大学、哥伦比亚大学和伍斯特州立大学的外展项目相结合。该团队将积极与美国自然历史博物馆合作，在博物馆外展中突出这个项目。该团队还将包括一名PolarTREC教师作为研究团队的成员。地貌研究结果将在波士顿大学以3D形式展示。南极数字图像分析实验室。这项研究将成为波士顿大学博士论文的基础。

Intellectual Merit: The PIs propose to complement the ANDRILL marine record with a terrestrial project that will provide chronological control for past fluctuations of the West Antarctic Ice Sheet (WAIS) and alpine glaciers in McMurdo Sound. The project will develop high-resolution maps of drifts deposited from grounded marine-based ice and alpine glaciers on islands and peninsulas in McMurdo Sound. In addition, the PIs will acquire multi-clast/multi-nuclide cosmogenic analyses of these mapped drift sheets and alpine moraines and use regional climate modeling to shed light on the range of possible environmental conditions in the McMurdo region during periods of grounded ice expansion and recession. The PIs will make use of geological records for ice sheet and alpine glacier fluctuations preserved on the flanks of Mount Discovery, Black Island, and Brown Peninsula. Drifts deposited from grounded, marine-based ice will yield spatial constraints for former advances and retreats of the WAIS. Moraines from alpine glaciers, hypothesized to be of interglacial origin, could yield a first-order record of hydrologic change in the region. Synthesizing the field data, the team proposes to improve the resolution of existing regional-scale climate models for the Ross Embayment. The overall approach and anticipated results will provide the first steps towards linking the marine and terrestrial records in this critical sector of Antarctica.Broader impacts: Results from the proposed work will be integrated with outreach programs at Boston University, Columbia University, and Worcester State University. The team will actively collaborate with the American Museum of Natural History to feature this project prominently in museum outreach. The team will also include a PolarTREC teacher as a member of the research team. The geomorphological results will be presented in 3D at Boston University?s Antarctic Digital Image Analyses Lab. The research will form the basis of a PhD dissertation at Boston University.