Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e...8l&link_type=abstract
Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200
Astronomy and Astrophysics
Astronomy
Scientific paper
A precise solution for the motion of the Earth axis (precession and nutation) is required for the reduction of astronomical observations over a few centuries. On the other hand, over long time scales, the short term variations of the Earth axis can be neglected and only the long term variations of the obliquity and precession angle become dominant. These solution are used for the analysis of the paleoclimate signal present in the sedimentary records over several millions of years, according to Milankovitch theory of paleoclimates. The agreement between the computed insolation signal (that depends on the secular evolution of the Earth's orbit and spin axis) and the sedimentary records is now so well established that in the recently published geological timescale GTS2004 (Gradstein et al, 2004), the whole Neogen period (0-23 Ma) has been calibrated using the astronomical solution of Laskar et al (2004). In the continuation of this work, there is now an international effort for the astronomical calibration of the full Paleogene period (65 Ma). This goal is a difficult challenge for the computation of the Earth parameter evolution. Indeed, due to the chaotic evolution of its orbit (Laskar, 1989), the uncertainty on the solution diverges exponentially by a factor of 10 every 10 Myr. The present orbital solution of (Laskar, 2004) is estimated to be valid over about 40 Myr. To extend this solution over 65 Myr will require to improv the accuracy of the model by more than 2 order of magnitude. The situation of the solution for the evolution of the Earth's axis is even worse, due to the uncertainty of the past evolution of the tidal dissipation in the Earth-Moon system.
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