Subtropical Signatures of Holocene Climate Variability

全新世气候变化的亚热带特征

• 批准号: 9818631
• 负责人: Peter DeMenocal
• 金额: $ 25.25万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9818631&HistoricalAwards=false
• 关键词: Subtropical; Signatures; Holocene; Climate; Variability

This project will analyze stable isotopes and taxonomic assemblages of planktic foraminifera, and mineralogy of colian particles, in a north-south transect of cores along the Canary Current and the West African upwelling zone. Preliminary daa from a site off West Africa indicate the existence of a 1500-year thermal cycle during the Holocene, similar to a cycle identified in the subpolar North Atlantic. The study will explore the spatial extent of subtropical cooling events in the Holocene and attempt to determine whether they result from larger-scale changes in eastern boundary currents or local changes in West African upwelling.

该项目将分析沿加那利海流和西非上升流带沿着南北向剖面岩心中的南极有孔虫的稳定同位素和分类组合以及科莱恩颗粒的矿物学。 来自西非一个地点的初步数据分析表明，全新世期间存在一个1500年的热循环，类似于在北大西洋副极地发现的循环。 这项研究将探讨全新世亚热带冷却事件的空间范围，并试图确定它们是否是东部边界流的大规模变化或西非上升流的局部变化造成的。