The Role of Orbital Forcing in Periodic and Non-Periodic Climate Change During the Late Oligocene and Early and Middle Miocene

渐新世晚期和中新世早中期轨道强迫在周期性和非周期性气候变化中的作用

• 批准号: 0117532
• 负责人: James Zachos
• 金额: $ 14.2万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0117532&HistoricalAwards=false
• 关键词: Role; Orbital; Forcing; Periodic; Non

Original Message-----From: Poore, Richard Z Sent: Thursday, July 12, 2001 8:56 AMTo: Weller, MargaretSubject: summary for Zachosl awardScience Summary: This proposal requests support for a study to test a new hypothesis on the origin of intermittent transient glaciations of the early and middle Miocene (the Mi-events) and possibly the late Oligocene. New findings suggest that the largest of the glaciations (Mi-1) at the Oligocene/Miocene boundary coincided with a rare congruence of an extended low-amplitude orbital obliquity node with a period of low orbital eccentricity. The study focus on developing isotope records that will test the prediction that similar climate anomalies occur at 18.2 and 27 Ma when orbital calculations indicate extended low-amplitude obliquity nodes also correspond with intervals of low eccentricity.

原始信息-----来自：Poore， Richard Z发送：星期四，2001年7月12日8:56 am收件人：Weller， margaret主题：Zachosl奖摘要科学摘要：本提案要求支持一项研究，以验证中新世早期和中期（Mi-events）和可能的晚渐新世间歇性短暂冰期起源的新假设。新的发现表明，渐新世/中新世边界的最大冰期（Mi-1）与一个扩展的低振幅轨道倾角节点与一个低轨道偏心率周期的罕见重合。研究的重点是发展同位素记录，以验证在18.2和27 Ma发生类似气候异常的预测，当轨道计算表明延长的低振幅倾角节点也对应于低偏心间隔。