Subtropical Signatures of Holocene Climate Variability

该项目将分析沿加那利洋流和西非上升流的南北岩心样带中浮游有孔虫的稳定同位素和分类组合，以及colian颗粒的矿物学。来自西非海域的初步数据表明，在全新世存在一个1500年的热循环，类似于在北大西洋亚极地发现的一个循环。该研究将探索全新世亚热带变冷事件的空间范围，并试图确定它们是由东部边界流的大规模变化还是西非上升流的局部变化引起的。

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.