La2010: a new orbital solution for the long-term motion of the Earth
La2010: a new orbital solution for the long-term motion of the Earth
复制标题
DOI：
10.1051/0004-6361/201117504
复制
发表时间：
2011-08-01
影响因子：
6.5
通讯作者：
Manche, H.
中科院分区：
文献类型：
--
作者：
Laskar, J.;Fienga, A.;Manche, H.
本文提出了一种新的解决方案，用于从0到-2.5亿年的地球轨道运动的天文计算。相对于我们以前的数值解La 2004的主要改进是通过拟合超过1百万年的高度精确的数值星历INPOP 08（Integration Numerique Planetaire de l 'Observatoire de巴黎）的特殊版本来改进参数和初始条件的调整。岁差方程也被完全修改，不再对地球和月球的轨道运动进行平均。这个新的轨道解在过去或未来的5000万年以上都是有效的，偏心率变化的相位也是正确的。由于混沌的行为，解决方案的精度迅速下降超过这个时间跨度，我们讨论的各种解决方案超过50万年的行为。对于古气候校准，我们提供了几种不同的解决方案，都与最精确的行星星历兼容。因此，我们已经到了需要地质数据来区分5000万年以上行星轨道解的时候。
We present here a new solution for the astronomical computation of the orbital motion of the Earth spanning from 0 to -250 Myr. The main improvement with respect to our previous numerical solution La2004 is an improved adjustment of the parameters and initial conditions through a fit over 1 Myr to a special version of the highly accurate numerical ephemeris INPOP08 (Integration Numerique Planetaire de l'Observatoire de Paris). The precession equations have also been entirely revised and are no longer averaged over the orbital motion of the Earth and Moon. This new orbital solution is now valid over more than 50 Myr in the past or into the future with proper phases of the eccentricity variations. Owing to the chaotic behavior, the precision of the solution decreases rapidly beyond this time span, and we discuss the behavior of various solutions beyond 50 Myr. For paleoclimate calibrations, we provide several different solutions that are all compatible with the most precise planetary ephemeris. We have thus reached the time where geological data are now required to discriminate between planetary orbital solutions beyond 50 Myr.