天文气候学10万年问题的研究

A STUDY ON THE PROBLEM OF 100ka CYCLES OF ASTROCLIMATOLOGY

为了研究第四纪晚更新世 (约 10 0万年前到 2万年前 )古气候的周期变化以及在轨道尺度上气候系统对太阳辐射的响应 ,本文发展了适合于非线性非平稳数据的分析方法即经验模态分解 (EMD) ,对太阳辐射古气候记录进行了分析 ,进而重新认识了地球轨道周期变化影响下的太阳辐射的气候意义 .研究结果表明 ,太阳辐射中偏心率的影响是相当大的 ,而不是以前认为的不到 1%的影响 ,至少它是和太阳辐射的黄赤交角 。

We develop an analysis method of empirical mode decomposition (EMD) applicable to nonlinear and unstable data. Our purpose is to study the periodical change and the response of the climate system to solar radiation on a obit scale in Pleistocene time. Our result shows that eccentricity band signal is much larger than previously estimated, i.e. 1% on solar radiations, and comparable with the precession and obliquity band signals. We should reconsider the role of solar radiations in the formation and maintenance of quaternary ice sheet cycles.