HR: 09:15h
AN: G21A-06    [PDF]
TI: Geophysical Use Of The New Parametrization Of The Earth Orientation
AU: * Lambert, S
EM: Sebastien.Lambert@obspm.fr
AF: SYRTE UMR8630/CNRS, Observatoire de Paris, 61 avenue de l'Observatoire, Paris, 75 75014 France
AU: Capitaine, N
EM: Nicole.Capitaine@obspm.fr
AF: SYRTE UMR8630/CNRS, Observatoire de Paris, 61 avenue de l'Observatoire, Paris, 75 75014 France
AB: The increase of the accuracy of the space and geodetic techniques giving access to the Earth orientation, as well as the improvement of the terrestrial and celestial reference systems, require, for the best scientific benefit, a more accurate modelisation of the Earth rotation. In the framework of the IAU 2000 Resolutions (especially Resolution B1.8 recommending the use of the Celestial Ephemeris Origin), analysis centers are asked to produce X, Y coordinates of the CIP in the ICRS instead of the classical parameters dpsi, depsilon. The aim of this paper is to provide the transformation formulae in order to extract geophysical parameters from the observed EOP. In particular, we provide expressions to transform the CIP coordinates X, Y into prograde and retrograde nutation amplitudes. We also provide realistic evaluation of coupling effects between precession-nutation and variations in the Earth's angular velocity.
DE: 1229 Reference systems
DE: 1249 Tides--Earth
SC: Geodesy [G]
MN: 2003 Fall Meeting