Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..ng41a05c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #NG41A-05
Physics
1214 Geopotential Theory And Determination, 1221 Lunar Geodesy And Gravity (6250), 1239 Rotational Variations, 1249 Tides--Earth, 1255 Tides--Ocean (4560)
Scientific paper
Tidal friction phenomena results in an imperfectly response of the solid Earth and its ocean to tidal forces, and hence yields a non-equilibrium tidal bulge, which lags behind the primarily acting tidal potential. The tidal bulge exerts a secular torque causing the Earth rotation rate to decrease and the lunar orbit to expand as its angular momentum increases. Advances in space geodetic technology with a long term SLR data from multiple geodetic satellites have permitted detection of the effects of the tidal friction phenomena within the Earth-Moon system. Several solutions of ocean tidal coefficients have been determined simultaneously with the Earth's gravity field, such as the EGM96, TEG4 and GRIM-5, from analysis of space geodetic measurements over past several decades. The tidal accelerations of the lunar motion and Earth's rotation rate are estimated to be 25.4+/-0.15 ("/cnetury2) and -5.402+/-0.034 (10-22 rad/sec), respectively, from those solutions. In light of the improved knowledge of ocean tides from the Topex/Poseidon satellite altimeter mission, the ocean and Earth tide signals in space geodetic date become separable for measuring the phase lag of the tidal bulge. Although it is limited to only the principal diurnal and semi-diurnal lunar tides: O1 and M2. This paper will discuss and present an assessment of satellite altimeter derived ocean tide solution and the constraints on the tidal dissipation in the Earth-Moon system implied by the space geodetic satellite observations. Acknowledgments: This research was supported by the National Aeronautics and Space Administration under grants NAG5-9989 and NGA5-5710.
Cheng Mowei
Tapley B. B.
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