lio-Pleistocene Aridification of North Africa and ntensification of Equatorial Atlantic Divergence

北非更新世干旱化与赤道大西洋辐散加剧

• 批准号: 8911206
• 负责人: William Ruddiman
• 金额: $ 21.77万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-08-15 至 1992-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911206&HistoricalAwards=false
• 关键词: lio; Pleistocene; Aridification; North; Africa

The objective of the study is to explore the long-term burial fluxes of North African dust and equatorial Atlantic biogenic opal at two Leg 108 ODP sites. Four causal factors will be focused on: insolation forcing, northern Hemisphere ice sheets, tectonic uplift and linkages between equatorial and Antarctic circulation. Stable isotopic stratigraphy will provide time resolution and define the fluxes of opal and dust at orbital band (20 to 100 K.yrs.) and facilitate comparison with other climatic proxies. Clay mineral analysis will provide record of African aridity. Uplift influence will be assessed through modeling using the General Circulation Model. The study is a continuation of the PI's extremely productive line of investigation. It extends his previous work further back in time as well as broadens the scope.

本研究的目的是探讨长期埋葬 北非尘埃和赤道大西洋生物成因的通量 在两个第108航次臭氧消耗潜能值地点发现蛋白石。 四个原因将是 主要集中在：日照强迫，北方冰盖， 构造隆升和赤道与南极之间的联系 流通 稳定同位素地层学将提供时间 分辨率和定义蛋白石和尘埃在轨道带的通量 (20 100 K. yrs）与其他气候条件进行比较， 代理人 粘土矿物分析将提供非洲 干旱 将通过建模来评估Ucampus的影响 使用大气环流模型。 这项研究是一个延续 私家侦探卓有成效的调查路线 它 将他以前的工作延伸到更早的时间， 扩大了范围。