Abstract
The long-term tidal gravity observations of about 27 a obtained with superconducting gravimeters (SG) at stations in Wuhan (China), Brussels (Belgium) and Strasbourg (France) are analyzed comprehensively. The quality factors of these observations at various stations are obtained and the tidal parameters are determined accurately. The efficiency when using various procedures on improving accuracy of the tidal parameters is discussed. The loading corrections on tidal parameters are carried out based on the global ocean tidal models. The correlations between the observed residuals and air pressure change are studied, the atmospheric gravity admittances in both temporal and frequency domains are determined, and the possible reasons of inducing the discrepancy between the observed tidal parameters and those in the standard tidal models are studied.
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