Towards Establishing Density Structure of the Antarctic Circumpolar Current during the Last Glacial Maximum

建立末次盛冰期南极绕极流的密度结构

• 批准号: 1345378
• 负责人: Jean Lynch-Stieglitz
• 金额: $ 9.21万
• 依托单位: Georgia Tech Research Corporation
• 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: 2013-08-15 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1345378&HistoricalAwards=false
• 关键词: Towards; Establishing; Density; Structure; Antarctic

Intellectual Merit: The PIs propose a pilot study to investigate the feasibility of establishing the structure of the Antarctic Circumpolar Current (ACC) during the Last Glacial Maximum (LGM) using oxygen isotopes in benthic foraminifera. While such measurements are plentiful north of the ACC, there is only one published LGM benthic oxygen isotope measurement south of the ACC. The PIs will analyze a series of sediment cores south of the ACC to determine if they can identify cores with the appropriate stratigraphy and sufficient benthic foraminifera to establish a profile of LGM benthic oxygen isotopes. They will also investigate the possibility of reconstructing the LGM density contrast across the ACC based on existing data and dynamical constraints. The outcomes of this work could provide strong constraints on both the dynamical and biogeochemical behavior of the ACC, an important component of the ocean-atmosphere system.Broader impacts: This work could help fill a gap in current dynamical understanding of the interactions between atmospheric winds, ocean eddies and the density structure, which is an area of active research in the climate dynamics community. The PIs will provide research experience for an undergraduate student from an under-represented group.

智力优点：PIS提出了一项试点研究，以研究在最后一次冰川最大值（LGM）使用底栖有孔虫中的氧同位素在最后一次冰川最大值（LGM）期间建立南极圆极电流（ACC）的可行性。尽管此类测量位于ACC以北，但ACC以南的LGM底栖氧同位素测量值只有一个发表的LGM底栖同位素测量。 PI将分析ACC以南的一系列沉积物核心，以确定它们是否可以鉴定具有适当地层和足够的底栖有孔虫的核心，以建立LGM底栖氧同位素的特征。他们还将根据现有数据和动态约束来研究在ACC上重建LGM密度对比的可能性。这项工作的结果可能会对ACC的动态和生物地球化学行为（海洋 - 大气系统的重要组成部分）提供强烈的限制。Broader的影响：这项工作可以帮助填补当前对大气风，海洋涡流，海洋涡流和密度结构之间的相互作用的差距，这是在气候动力学群落中积极研究的领域，这是气候动力学的一个领域。 PI将为来自代表性不足的小组的本科生提供研究经验。