Recent advances in modeling precession-nutation

Details Recent advances in modeling precession-nutation Recent advances in modeling precession-nutation

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jsrs.meet...82d&link_type=abstract

"Proceedings of the "Journées Systèmes de Référence Spatio-temporels 2007". Observatoire de Paris, 17-19 September 2007. Editor:

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Nutations are computed from modeling the gravitational forcing acting on the Earth from the Moon, the Sun and, to a minor extend, the other planets of the Solar system, and from modeling the interior of the Earth. One computes the Earth response to the gravitational forcing and then adds the geophysical effects from the surface liquid layers (atmosphere and ocean). The models for the interior of the Earth generally consider the existence of a liquid core, of a solid deformable inner core, and of a solid deformable inelastic mantle; the boundaries between the core and the inner core (ICB for Inner Core Boundary) and the core and the mantle (CMB for Core-Mantle Boundary) are flattened and can deform; the coupling mechanisms between the inner core, the outer core, and the mantle involve inertial coupling, gravitational coupling, pressure coupling, electromagnetic coupling, and viscous coupling. The last adopted model by the IAU and the IUGG, the so-called MHB2000 model from Mathews et al. (2002), considers all these coupling mechanisms except the viscous coupling, which is further considered in Guo et al. (2004). The rigid Earth nutations that are considered for this adopted model are those of Souchay et al. (1999). In the present paper we concentrate on the steps performed within the group related to the Royal Observatory of Belgium, toward the next decimal of nutation theory and observation. In particular, we examine the improvements on observations, on atmospheric and oceanic contributions to nutation (for the free and forced nutations), and on the computation of dissipative and excitation mechanisms for nutation.

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