Rapid Climate Change, Clay and Carbonate Accumulation, and Lower North Atlantic Deepwater Behavior during the Dansgaard-Oeschger Interstadial Events on the Bermuda Rise

百慕大隆起 Dansgaard-Oeschger 间质事件期间的快速气候变化、粘土和碳酸盐积累以及北大西洋下游深水行为

• 批准号: 9709500
• 负责人: Edward Boyle
• 金额: $ 33.26万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9709500&HistoricalAwards=false
• 关键词: Rapid; Climate; Change; Clay; Carbonate

This project will examine changes in North Atlantic Deep Water (NADW) flow at the highest possible age resolution during the most recent interstadials (Oxygen Isotope Stage 3) in a core from the Bermuda Rise. 230Th will be used to determine sedimentation rate and adjust age control, and Cd/Ca in benthic foraminifera will be used as a tracer for NADW. The goal is to determine whether there were millenial- scale variations in NADW and, if so, whether they correlate in timing and magnitude with variations previously identified in ice cores from Greenland. A positive answer would tend to support the hypothesis that changes in thermohaline flow are linked to high-latitude ice growth.

该项目将研究在百慕大隆起的一个岩芯的最近一次站间(氧同位素第三阶段)期间，北大西洋深水以尽可能高的年龄分辨率流动的变化。230Th将用于确定沉积速率和调整年龄控制，底栖有孔虫中的Cd/Ca将作为NADW的示踪剂。目标是确定NADW是否存在千年级的变化，如果是的话，它们在时间和幅度上是否与以前在格陵兰冰芯中发现的变化相关。一个肯定的答案将倾向于支持这样的假设，即温盐流动的变化与高纬度冰的增长有关。