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.

该项目将在沿着金丝雀电流和西非上升区的岩心南北的岩心骨外部分析浮游有孔虫的稳定同位素和分类学组合。 来自西非附近地点的初步DAA表明在全新世期间存在1500年的热周期，类似于在北大西洋亚极地下的一个周期。 该研究将探讨全新世中亚热带冷却事件的空间范围，并试图确定它们是由东部边界电流的大规模变化还是西非上升流动的局部变化造成的。