Collaborative Research: Evolution of the deep South Atlantic since the last interglacial period inferred from a depth transect of Cape Basin sediment cores

合作研究：从开普盆地沉积物岩心的深度横断面推断出末次间冰期以来南大西洋深处的演化

• 批准号: 1131778
• 负责人: Christopher Charles
• 金额: $ 19.58万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131778&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolution; deep; South

There is considerable evidence that the deep ocean plays some role in governing the evolution of Pleistocene ice ages and interglacial periods. Yet after several decades of research, there is still debate over the degree to which sedimentary tracers can distinguish differences in deep ocean circulation between ice age oceans and the modern ocean. This collaborative project will investigate past ocean circulation changes by generating multi-proxy records for several common paleoceanographic tracers (including benthic d18O and d13C, radiocarbon, Cd/Ca, Zn/Ca and B/Ca) for eight time slices over the last glacial-interglacial cycle using cores along a depth transect from the Namibian margin and Cape Basin. These time slices would represent the step in evolution from interglacial state through a full glacial cycle. The research will focus around a series of questions concerning water mass evolution in the Atlantic Ocean, the connection between circulation and carbon cycling, differences between conservative and non-conservative proxies, and the possibility for major boundary condition changes distinct from ocean mixing effects. Broader impacts:This project will provide a detailed picture of the mixing between the two principal deep water masses of the world's ocean across a full ice cycle, which will be of widespread use to oceanographers and climate scientists. Funding will support two Ph.D. students and provide significant experience in proxy data collection and interpretation. The project will also serve as a platform for a summer REU fellow and provide support for several undergraduate students to learn research and laboratory techniques. Additionally, funding will help develop a lesson on deep earth circulation through the Deep Earth Academy at Texas A&M University.

有大量证据表明，深海在管理更新世冰河时代和冰川间时期的演变中起着一定作用。 然而，经过几十年的研究，关于沉积示踪剂可以区分冰河时代海洋与现代海洋之间深海循环的差异的程度仍然存在争议。 该协作项目将通过为几个常见的古环幻灯片（包括底栖D18O和D13C，放射性碳，CD/CA，ZN/CA和B/CA）生成多种古代摄影示踪剂的多种记录来调查过去的海洋循环变化，以在最后一个冰川相互连接的循环中使用Depth Fromn namibian cape和cape cape cape和Cape cape cape，以在最后的冰川相互关系中进行八个时间片。 这些时间切片将代表从冰间状态到完整冰川周期进化的步骤。 这项研究将集中在有关大西洋水量进化的一系列问题上，循环和碳循环之间的联系，保守和非保守代理之间的差异以及与海洋混合效应不同的主要边界条件变化的可能性。更广泛的影响：该项目将在整个冰期循环中详细介绍世界海洋的两个主要深水块之间的混合，这将广泛用于海洋学家和气候科学家。 资金将支持两位博士学位。学生并在代理数据收集和解释方面提供丰富的经验。 该项目还将作为夏季REU研究员的平台，并为几位本科生学习研究和实验室技术提供支持。 此外，资金将有助于通过德克萨斯A＆M大学的深层地球学院开发有关深层循环的课程。