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

合作研究：沿着加州边缘的千禧年规模的碳酸盐沉积事件及其与古海洋学和古气候的联系

• 批准号: 9811272
• 负责人: Mitchell Lyle
• 金额: $ 27.26万
• 依托单位: Boise State 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: 1999-01-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9811272&HistoricalAwards=false
• 关键词: Collaborative; Research; Millennial; Scale; Carbonate

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.

摘要该项目将检验以下假设：晚更新世期间加利福尼亚州沿海生物碳酸盐积累的千年规模增加是由于地表水产量的变化，而不是由于差异性保存所致。 据推测，产量是由不同的沿海上升流造成的，风力更强，上升流对应于大陆气候干燥的时期。 在过去 50 万年中，将每隔 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率。 将分析两个持续时间为 150,000 的时间切片，以分析浮游有孔虫的分类和同位素组成，以确定上升流的程度，并分析花粉以评估同时发生的大陆气候。