Pliocene Climate: Testing the Possible Link Between Global Warmth and Upwelling Intensity Along the California Margin

小行星9809438 这个项目有两个不同的目标，都使用从加州边缘收集的上新世沉积物。 目的1是确定是否在上新世中期的高方解石积累的间隔是由于高浮游生物生产，而不是溶解的影响。 如果是前者，则意味着上新世暖期的上升流和风应力较强。 目标2是寻找世纪至千年尺度的上升流在同一时间间隔内变化的证据。 方解石和有机碳的积累率以及南极有孔虫的分类组合和稳定同位素组成将用于这两项研究，以评估初级生产和海面温度变化。

9809438 Ravelo This project has two separate goals, both using Pliocene sediments collected from the California margin. Objective 1 is to determine whether an interval of high calcite accumulation in the mid-pliocene was a result of high plankton production, rather than an effect of dissolution. If the former, this would imply stronger upwelling and wind stress during the Plioene warm interval. Objective 2 is to look for evidence of century- to millenial-scale variability in upwelling during the same time interval. Accumulation rates of calcite and organic carbon, and taxonomic assemblage and stable isotope composition of planktic foraminifera will be used in both studies to assess primary production and sea surface temperature variations.