Terrestrial Geological Context for Glacier Change in the Northeast Antarctica Peninsula

智力优势：PI建议通过南极半岛东北部的全新世冰川变化来研究末次冰期最大期，该地区以冰架崩塌和上游冰川退缩而闻名。然而，缺乏长期背景来了解最近事件在较长时间尺度上的相对重要性。PI将获得有关詹姆斯罗斯岛群岛和前拉森-A冰架附近地区的前冰缘位置、冰厚度、冰川退缩和变薄速率以及全新世冰川变化的数据。这些数据包括最高和最低限度的14 C和宇宙成因核素暴露日期与地貌和地层相结合。了解冰川事件的范围，性质和历史对于将当前冰川范围的变化置于长期背景下非常重要。这项研究还将有助于了解该地区冰架和冰川对气候变化的敏感性。陆地终止冰川的变化记录也将解决自末次冰期以来和整个全新世与气候变化有关的悬而未决的问题。主要研究员将在与安塔研究所的科学家合作开展实地项目期间收集样本&。rtico Argentino和韩国极地研究所计划作为现有更大研究项目的一部分。更广泛的影响：拟议的工作包括与阿根廷和韩国的合作。方案执行主任目前正在参与或发起将纳入该项目的教育和外联活动。其中包括与美国自然历史博物馆，美国军事学院在西点，并在他们的实验室本科生参与互动。该项目提供了一个重要的机会，使公众参与，因为它侧重于一个领域，环境变化是大众媒体关注的对象。

Intellectual Merit: The PIs propose to investigate last glacial maximum through Holocene glacial change on the northeastern Antarctic Peninsula, an area distinguished by dramatic ice shelf collapses and retreat of upstream glaciers. However, there is a lack of long-term context to know the relative significance of recent events over longer time scales. The PIs will obtain data on former ice margin positions, ice thicknesses, glacier retreat and thinning rates, and Holocene glacier change in the James Ross Island Archipelago and areas near the former Larsen-A ice shelf. These data include maximum- and minimum-limiting 14C and cosmogenic-nuclide exposure dates integrated with geomorphology and stratigraphy. Understanding the extent, nature, and history of glacial events is important for placing current changes in glacial extent into a long-term context. This research will also contribute to understanding the sensitivity of ice shelves and glaciers in this region to climate change. Records of changes in land-terminating glaciers will also address outstanding questions related to climate change since the LGM and through the Holocene. The PIs will collect samples during cooperative field projects with scientists of the Instituto Antártico Argentino and the Korea Polar Research Institute planned as part of existing, larger, research projects.Broader impacts: The proposed work includes collaborations with Argentina and Korea. The PIs are currently involved in or are initiating education and outreach activities that will be incorporated into this project. These include interactions with the American Museum of Natural History, the United States Military Academy at West Point, and undergraduate involvement in their laboratories. This project provides a significant opportunity to engage the public as it focuses on an area where environmental changes are the object of attention in the popular media.