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

智力优势：PI建议用一个陆地项目来补充ANDRILL海洋记录，该项目将对南极西部冰盖（WAIS）和麦克默多海峡的高山冰川过去的波动进行年代控制。该项目将绘制麦克默多海峡岛屿和半岛上的陆基海冰和高山冰川沉积物的高分辨率地图。此外，PI将获得这些映射的漂流表和高山冰碛物的多碎屑/多核素宇宙成因分析，并使用区域气候建模来阐明在接地冰扩张和衰退期间麦克默多地区可能的环境条件的范围。研究所将利用地质记录，记录保存在发现山、黑岛和布朗半岛两侧的冰盖和高山冰川的波动。从地面沉积的漂移，海洋为基础的冰将产生空间限制以前的进步和撤退的WAIS。来自高山冰川的冰碛，假设是间冰期的起源，可以产生该地区水文变化的一级记录。综合实地数据，该团队建议提高罗斯湾现有区域尺度气候模型的分辨率。总体方法和预期结果将为在南极洲这一关键地区将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计划相结合。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一项目。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.