HR: 16:45h
AN: G34A-04 INVITED     [Abstracts]
TI: Contributions of the fluid layers to the motion of the geocenter
AU: * RAMILLIEN, G
EM: ramillie@notos.cst.cnes.fr
AF: LEGOS UMR5566, Observatoire Midi-Pyr‚n‚es 18, Avenue Edouard Belin, Toulouse, 31400 France
AU: FEISSEL-VERNIER, M
EM: feissel@ensg.ign.fr
AF: SYRTE UMR8630, Observatoire de Paris 61, Avenue de l'Observatoire, Paris, 75014 France
AU: FEISSEL-VERNIER, M
EM: feissel@ensg.ign.fr
AF: IGN/LAREG, 6-8, Avenue Blaise Pascal Cit‚ Descartes Champs-sur-Marne, Marne-la-Vall‚e, 77455 France
AU: LE BAIL, K
EM: lebail@ensg.ign.fr
AF: IGN/LAREG, 6-8, Avenue Blaise Pascal Cit‚ Descartes Champs-sur-Marne, Marne-la-Vall‚e, 77455 France
AU: VALETTE, J
EM: valette@cls.fr
AF: CLS, 8-10, rue HermŠs Parc Technologique du Canal, Ramonville St-Agne, 31526 France
AB: Time-variations of the location of the geocenter relative to the Earth's crust are measured since the early 1990's by precise satellite positioning techniques (SLR, DORIS, GPS). On the other hand, redistributions of mass inside the Earth's system are expected to give rise to such motions. We computed time-series of hydrological contributions to the motion of the Earth's center of mass using global model outputs: for the atmosphere (IB) (ECMWF, NCEP), the oceans (ECCO assimilation) and the continental waters (LaD model). We study their respective contributions at the seasonal, inter-annual and longer time-scales and we compare with geodetic results.
DE: 1223 Ocean/Earth/atmosphere interactions (3339)
DE: 1229 Reference systems
DE: 1234 Regional and global gravity anomalies and Earth structure
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting