A study on the problem of 100ka cycles of astroclimatology
天文气候学10万年问题的研究

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.