Collaborative Research: Millennial-Scale Carbonate Deposition Events Along the California Margin and their links to Paleoceanography and Paleoclimate

摘要：本项目将验证一个假设，即加利福尼亚海岸晚更新世期间生物碳酸盐积累的千年尺度增加是由于地表水产量的变化，而不是由于差异保存。反过来，这种生产被认为是由不同的沿海上升流造成的，强风和上升流与大陆气候干燥的时期相对应。在过去的50万年中，每隔500年对一套ODP岩心进行采样，以确定方解石、蛋白石和有机碳的积累速率。将对两个150000年的时间片进行浮游有孔虫的分类和同位素组成分析，以确定上升流的程度，并对花粉进行评估，以评估共发生的大陆气候。

SUMMARYThis project will test the hypothesis that millenial-scale increases in biogenic carbonate accumulation during the Late Pleistocene off the coast of California resulted from changes in surface water production, rather than from differential preservation. The production in turn is postulated to have resulted from varying coastal upwelling, with stronger winds and upwelling corresponding to times of drier continential climate. A suite of ODP cores will be sampled at 500-year intervals over the last 500,000 years to determine accumulation rates of calcite, opal and organic carbon. Two time slices of 150,000 duration will be anlayzed for taxonomic and isotopic composition of planktic foraminifera to determine degree of upwelling, and for pollen to assess cor-occurring continental climate.