从40万年长偏心率周期看米兰科维奇理论

The 405 ka eccentricity cycle characterizes the variability of monsoon precipitation and marine carbon cycle over a long geological history, which has been revealed by continental and marine sedimentary records from the Precambrian to the Cenozoic. As a fundamental tempo of hydrological and carbon cycle over the Earth’s surface, particularly in low-latitude areas, the 405 ka eccentricity cycle is used as a metronome for astronomically calibrated timescale. This eccentricity cycle, however, could be obscured during some specific periods, caused by massive volcanic-sourced CO₂ emission, the revolution of biosphere, and the expansion of the polar ice sheets. The obscuring of eccentricity cycles, in fact, provides a novel perspective to study significant evolution of the Earth’s surface system, and to unveil mechanisms of climate changes across the greenhouse to the icehouse period. At the end of this paper, we give some suggestions on how to conduct future studies of the astronomical forcing of climate change in China. It is highly prospective that Chinese scientist community can put forward this academic topic to a cutting-edge level.