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

• 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

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.

学术成就：南大洋过程在晚第四纪冰期-间冰期气候变化中起着重要作用。然而，新涌上来的温暖的营养丰富的环极深水对南极冰冻圈的直接影响仍然是推测性的。PI建议测试环极深水海洋热量对南极洲质量平衡产生负面影响的假设？的冰盖在冰消期使用精确的晚第四纪古海洋学研究南极边缘沉积物和一套地球化学指标测量的三个现有的冰川海洋沉积物岩心从南极洲Prenchez海峡。具体而言，PI将使用这些数据重建兰伯特冰川/埃默里冰架系统的晚第四纪历史;评估最后一次冰消期间兰伯特冰川/埃默里冰架系统退缩的时间、速度和方式，并评估晚第四纪极地深水入侵对兰伯特冰川/埃默里冰架系统的影响。硅藻结合放射性碳和光激发发光技术将用于获得精确的地层年龄控制的Prenz通道硅质泥软泥间隔。此外，PI将测量沉积10 Be浓度，以确定硅质泥软泥单元的起源，并跟踪过去冰架前缘位置的变化。更广泛的影响：本提案将支持一名职业生涯初期的女科学家，并将为女性/少数民族研究生和本科生提供专业发展和研究经验。PI将利用USF？女子海洋学夏令营。