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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Constraints on astronomical parameters from the geological record for the last 25 Myr
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Constraints on astronomical parameters from the geological record for the last 25 Myr

机译：最近25 Myr的地质记录对天文参数的约束

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摘要

We develop a new method, based on interference patterns between the precession and obliquity components of geological data from Ocean Drilling Program (ODP) Leg 154 and astronomical solutions, to extract small changes in the precession constant p due to tidal dissipation over the last 25 million years and to put numerical constraints on the parameters for tidal dissipation and the dynamical ellipticity of the Earth. We show that these parameters have remained close to the present day values over the last 25 million years. The best fitting astronomical solution we obtained gives rise to a value of 0.9999 times the current day dynamical ellipticity, and 1.004 times the current day tidal dissipation value as used in the algorithm of Laskar (1993). Our range of uncertainty is 0.9996-1.0001 for the dynamical ellipticity of the Earth and 0.945-1.025 for the tidal dissipation. Our model does not require changes in these parameters over the last 25 Ma and we show that using the solution of Laskar (1993) with present day values for dynamical ellipticity and tidal dissipation as a tuning target does not introduce large errors during astronomical tuning. Our results indicate that the Earth has not crossed into resonance with Saturn and Jupiter during the last few million years. Our conclusions depend on the assumption of a correct initial tuning of the ODP Leg 154 data.
机译：我们基于海洋钻探计划（ODP）腿154地质数据的进动与倾斜分量之间的干扰模式和天文学解决方案，开发了一种新方法，以提取过去2500万潮汐耗散引起的进动常数p的微小变化年，并在潮汐耗散和地球动力学椭圆率的参数上设置了数值约束。我们表明，在过去的2500万年中，这些参数一直保持接近当前值。我们获得的最佳拟合天文解得出的值是当前动态椭圆率的0.9999倍，是Laskar（1993）算法中使用的当前潮汐耗散值的1.004倍。对于地球的动态椭圆率，我们的不确定性范围为0.9996-1.0001，对于潮汐耗散，我们的不确定性范围为0.945-1.025。我们的模型不需要在最近的25 Ma内改变这些参数，并且我们证明了使用Laskar（1993）的解决方案以当前的动态椭圆率和潮汐耗散值作为调整目标不会在天文调整期间引入大的误差。我们的结果表明，在过去的几百万年中，地球并未与土星和木星发生共振。我们的结论取决于对ODP Leg 154数据进行正确初始调整的假设。

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