Establishing the Phase of the Pliocene Astronomical Time Scale Relative to Orbital Forcing

建立上新世天文时间尺度相对于轨道强迫的相位

• 批准号: 9711412
• 负责人: Steven Clemens
• 金额: $ 5.83万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711412&HistoricalAwards=false
• 关键词: Establishing; Phase; Pliocene; Astronomical; Time

This project will establish the timing (phase) of global climate change relative to changes in the Earth's orbit about the Sun for the period between 1 and 5 million years ago. Emphasis will be upon using an assumption of constant phase relative to tilt of the Earth's axis, rather than the more-common approach of constant phase relative to orbital precession. Iterative experiments will be done using different age models and filters on four independent data sets. In addition to producing a master age model which can be used by others for detailed comparisons of globally distributed climate records, the project will assess the sensitivity of these techniques to various assumptions, and provide insight into mechanisms of past climate change.

该项目将确定100万至500万年前全球气候变化相对于地球绕太阳轨道变化的时间（阶段）。 重点是使用相对于地球轴倾斜的恒定相位假设，而不是更常见的相对于轨道岁差的恒定相位方法。 将使用不同的年龄模型和过滤器对四个独立的数据集进行迭代实验。 除了制作一个可供其他人用于详细比较全球分布的气候记录的主年龄模型外，该项目还将评估这些技术对各种假设的敏感性，并深入了解过去气候变化的机制。