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.

总结项目将检验以下假设：在加利福尼亚海岸的更新世晚期，千禧年尺度增加了碳酸盐酸盐积累，这是由于地表水生产的变化而不是由于保存差异而导致的。 反过来，产量推测是由于沿海上升流变化而产生的，风和上升的趋势与较干燥的持续气候相对应。 在过去的500，000年中，将以500年的间隔采样一套ODP核心，以确定方解石，蛋白石和有机碳的积累速率。 对于板岩有孔虫的分类学和同位素组成，将对150,000个持续时间的两次切片持续，以确定上升流的程度，并使花粉评估Cor-Cor-Cercurring cor-cocurring大陆气候。