Muller R A, MacDonald G J
Department of Physics and Lawrence Berkeley Laboratory, University of California, Berkeley CA 94720, USA.
Proc Natl Acad Sci U S A. 1997 Aug 5;94(16):8329-34. doi: 10.1073/pnas.94.16.8329.
Spectral analysis of climate data shows a strong narrow peak with period approximately 100 kyr, attributed by the Milankovitch theory to changes in the eccentricity of the earth's orbit. The narrowness of the peak does suggest an astronomical origin; however the shape of the peak is incompatible with both linear and nonlinear models that attribute the cycle to eccentricity or (equivalently) to the envelope of the precession. In contrast, the orbital inclination parameter gives a good match to both the spectrum and bispectrum of the climate data. Extraterrestrial accretion from meteoroids or interplanetary dust is proposed as a mechanism that could link inclination to climate, and experimental tests are described that could prove or disprove this hypothesis.
气候数据的光谱分析显示出一个强烈的窄峰，周期约为10万年，根据米兰科维奇理论，这归因于地球轨道偏心率的变化。该峰的狭窄确实表明其起源于天文因素；然而，该峰的形状与将该周期归因于偏心率或（等效地）进动包络的线性和非线性模型均不相符。相比之下，轨道倾角参数与气候数据的光谱和双谱都有很好的匹配。有人提出，流星体或行星际尘埃的外星吸积是一种可以将倾角与气候联系起来的机制，并描述了可以证明或反驳这一假设的实验测试。
