STABILITY OF THE ASTRONOMICAL FREQUENCIES OVER THE EARTHS HISTORY FOR PALEOCLIMATE STUDIES
STABILITY OF THE ASTRONOMICAL FREQUENCIES OVER THE EARTHS HISTORY FOR PALEOCLIMATE STUDIES
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DOI：
10.1126/science.255.5044.560
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发表时间：
1992-01-31
期刊：
影响因子：
56.9
通讯作者：
LASKAR, J
中科院分区：
文献类型：
--
作者：
BERGER, A;LOUTRE, MF;LASKAR, J
在过去5亿年里，影响地球气候的主要天文频率的预期变化可能足够强烈，足以在地质记录中检测到，而且在几个案例中已经推断出这种影响。计算表明，地月距离的缩短和时间上白天长度的缩短导致了倾角和气候进动的基本周期缩短，在过去的5亿年里，倾角和气候进动的基本周期从54年缩短到35年，41年缩短到29年，23年缩短到19年，19年缩短到16000年。同时，岁差常数从每年50角秒增加到61角秒。行星系统的混沌运动引起的频率变化要小得多，它们对地球绕太阳轨道的气候进动周期、倾角周期和偏心周期的影响可以忽略不计。因此，第四纪气候研究使用的偏心期可被认为在第四纪以前或多或少是恒定的。
The expected changes over the past 500 million years in the principal astronomical frequencies influencing the Earth's climate may be strong enough to be detectable in the geological records, and such effects have been inferred in several cases. Calculations suggest that the shortening of the Earth-moon distance and of the length of the day back in time induced a shortening of the fundamental periods for the obliquity and climatic precession, from 54 to 35, 41 to 29, 23 to 19, and 19 to 16 thousand years over the last half-billion years. At the same time, the precessional constant increased from 50 to 61 arc seconds per year. The changes in the frequencies of the planetary system due to its chaotic motion are much smaller; their influence on the changes of the periods of climatic precession, obliquity, and eccentricity of the Earth's orbit around the sun can be neglected. Eccentricity periods used for Quaternary climate studies may therefore be considered to have been more or less constant for pre-Quaternary times.