Geophysical excitation of the Earth orientation parameters EOP and its contribution to GGOS |
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| Authors: | Vronique Dehant Olivier de Viron Jean-Pierre Barriot |
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| Institution: | aRoyal Observatory of Belgium, 3 Avenue Circulaire, 1180 Brussels, Belgium;bObservatoire Midi-Pyrénées, Toulouse, France |
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| Abstract: | We discuss how the geophysical fluids affect the Earth orientation parameters (EOP) and in particular polar motion and nutation. We show that the Earth orientation modeling is a perfect example of the integrated approach recommended by GGOS. GGOS considers the Earth system as a whole, including the solid Earth as well as the fluid components; geodesy observes and models the dynamics inside this system through the static and time-varying gravity field, the station displacements, and the Earth orientation parameters and the associated length-of-day variation, nutation and polar motion. Global-scale transfer in the Earth system and its geodetic consequences is proposed to be the central theme of GGOS. We show that the Earth orientation parameters perfectly fit this theme. |
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| Keywords: | GGOS Earth rotation Polar motion Nutation Earth– atmosphere– ocean interaction |
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