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

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
项目状态：
已结题
起止时间：
1997-07-15 至 2000-06-30
来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9709500&HistoricalAwards=false
关键词：
RapidClimateChangeClayCarbonate

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中文摘要
翻译
该项目将在百慕大海隆的一个岩心中，以尽可能高的年龄分辨率，研究最近的海间（氧同位素阶段3）期间北大西洋深水流量的变化。 230 Th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将用作NADW的示踪剂。 目标是确定NADW是否存在千年尺度的变化，如果存在，它们是否在时间和幅度上与先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，即温盐流的变化与高纬度冰的生长有关。
英文摘要
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.
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