Late Quaternary Evolution of the Lambert Glacier/Amery Ice Shelf System, Prydz Bay, Antarctica

南极洲普里兹湾兰伯特冰川/阿默里冰架系统的晚第四纪演化

基本信息

批准号：
1246378
负责人：
Amelia Shevenell
金额：
$ 26.77万
依托单位：
University of South Florida
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2013
资助国家：
美国
起止时间：
2013-04-01 至 2019-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1246378&HistoricalAwards=false
关键词：
Late Quaternary Evolution Lambert Glacier

项目摘要

Intellectual Merit: Southern Ocean processes play an important role in Late Quaternary glacial-interglacial climate change. However, the direct influence of newly upwelled warm nutrient-rich Circumpolar Deep Water on the Antarctic cryosphere remains speculative. The PI proposes to test the hypothesis that Circumpolar Deep Water-derived ocean heat negatively impacts the mass-balance of Antarctica?s ice sheets during deglaciations using precisely dated late Quaternary paleoceanographic studies of Antarctic margin sediments and a suite of geochemical proxies measured on three existing glacial marine sediment cores from the Prydz Channel, Antarctica. Specifically, the PI will use these data to reconstruct the Late Quaternary history of the Lambert Glacier/Amery Ice Shelf system; evaluate the timing, speed, and style of retreat of the Lambert Glacier/Amery Ice Shelf system during the last deglaciation, and to assess the impact of Circumpolar Deep Water intrusions on the Lambert Glacier/Amery Ice Shelf system in the Late Quaternary. Diatom bound radiocarbon and optically stimulated luminescence techniques will be used to obtain precise stratigraphic age control for the Prydz Channel siliceous muddy ooze intervals. In addition, the PI will measure sedimentary 10Be concentrations to determine the origin of the siliceous muddy ooze units and to track past changes in the position of the ice shelf front.Broader impacts: This proposal will support an early career female scientist and will provide professional development and research experiences for women/minority graduate and undergraduate students. The PI will take advantage of USF?s Oceanography Camp for Girls.

知识分子的优点：南方海洋过程在第四纪晚期冰川冰川气候变化中起着重要作用。然而，新上升的富含营养富含营养的圆极深水对南极冰冻圈的直接影响仍然是投机性的。 PI提议测试以下假设：旋流深水衍生的海洋热对南极冰片的质量平衡产生了对南极冰片的质量平衡，该假设使用精确日期的季季晚期古环摄影研究对南极缘沉积物的晚期古环学研究和在现有的三个地球化学套件上进行了测量来自南极Prydz通道的冰川海洋沉积物核心。具体而言，PI将使用这些数据来重建兰伯特冰川/amery冰架系统的第四纪晚期历史；在最后一次退化期间，评估兰伯特冰川/amery冰架系统的务虚会的时机，速度和风格，并评估在晚期季四级晚期兰伯特冰川/杏仁冰架系统对近极深水侵入的影响。硅藻结合的放射性碳和光刺激的发光技术将用于获得Prydz通道硅质泥浆间隔的精确地层年龄控制。此外，PI还将测量Sedimentary 10BE浓度，以确定硅质泥土泥泥单元的起源，并跟踪冰架前部位置的过去变化。Broader的影响：该建议将支持早期的职业女性科学家，并将提供专业人士。妇女/少数民族毕业生和本科生的发展和研究经验。 PI将利用USF的女孩海洋学营地。