IERS Analysis Campaign to Investigate Motions of the Geocenter. With a special session at the Fall 1997 AGU Meeting, San Francisco, CA (USA).

Details IERS Analysis Campaign to Investigate Motions of the Geocenter. With a special session at the Fall 1997 AGU Meeting, San Francisco, CA (USA). IERS Analysis Campaign to Investigate Motions of the Geocenter. With a special session at the Fall 1997 AGU Meeting, San Francisco, CA (USA).

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999itn....25.....r&link_type=abstract

IERS Tech. Note, No. 25, IV + 121 p.

Statistics

Computation

14

Satellite Laser Ranging: Earth Core, Reference Systems: Earth

Scientific paper

Analyses of satellite laser ranging (SLR) data have strongly indicated that the coordinate frame of tracking stations attached to the Earth's crust moves detectably relative to the Earth's center of mass. This translational motion, when viewed from a rigid crust-fixed frame, is known as "geocenter motion" and is caused by the mass movement of planetary fluids, primarily the atmosphere and oceans. The motions likely involve tidal, non-tidal, and secular components. The Campaign to Investigate Motions of the Geocenter has been started. At least 42 individual researchers from more than 25 groups responded with proposals to analyze satellite tracking data for both tidal and non-tidal signals, to analyze data from geophysical excitations (including oceanic, atmospheric, and other fluid motions), and to compare and synthesize the analysis results. The Campaign culminated in a special session at the Fall 1997 AGU Meeting in San Francisco. The overall impression of the work presented there was that the next motion of the terrestrial reference frame relative to the Earth's center of mass is detectable but small, probably no more than ≡1 cm in any component. The diurnal and semi-diurnal tidal variations appear to be well determined and in good agreement with modern ocean tidal models. There seems to be some general agreement of the techniques in detecting seasonal variations. Geophysical computations of the expected motions based on global fluid motions are only roughly consistent with the observations.

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