Geochemical Record of Thermohaline Flow in the Southwest Atlantic: Watermass Geometry on Orbital and Millennial Time Scales

西南大西洋温盐流的地球化学记录：轨道和千年时间尺度上的水体几何

• 批准号: 9986748
• 负责人: Delia Oppo
• 金额: $ 30万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-01 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9986748&HistoricalAwards=false
• 关键词: Geochemical; Record; Thermohaline; Flow; Southwest

This project will address a hypothesized link between export of North Atlantic Intermediate Water to the South Atlantic and warming of South Atlantic upper waters. Model predictions indicate that during glacial intervals the reduction of NADW export should produce accumulation of upper ocean heat in the South Atlantic. The project will analyze stable isotopes and Cd/Ca in benthic foraminifera from a depth transect of cores on the Brazil margin. Emphasis will be upon the last glacial maximum, but exploratory work will also be done to determine if there is dateable evidence for rapid events during the earlier intervals (Isotope Stages 3-6).

该项目将解决北大西洋中层水出口到南大西洋与南大西洋上层水域变暖之间的假设联系。 模型预测表明，在冰期期间，NADW 输出的减少应该会导致南大西洋上层海洋热量的积累。 该项目将分析巴西边缘岩心深度横断面的底栖有孔虫中的稳定同位素和镉/钙。 重点将放在末次盛冰期，但也将进行探索性工作，以确定是否有早期间隔期间（同位素阶段 3-6）快速事件的可追溯证据。