On Studying The Load Effects In The Geophysical Fields With The Latest Ocean Tidal Models

The effects of ocean tide loading on the observations of the quantities (including gravity, displacement, tilt, strain, astronomical latitude and longitude and geoid) in the geophysical fields are studied in this paper by the method of integral Green's function. In the calculations, the latest global ocean tidal models such as Fes952, Csr3.0. Tpxo2, Csr4.0. and the former Schw80. which was the standard model before, are adopted. Meanwhile the data of china scas also contributes to the results.According to the quantities required to the computations, the ocean tidal model and its primary constructional methods are introduced in brief first, and the comparison of the recent ocean tidal models is made; secondly, the derivations and computations of the Green's functions are explained in details; thirdly, the way to computation of the integral Green's function is described, and the three points those must be considered in the process are also discussed and the improvement is given; at last, the calculations are made to obtain the influences of ocean tide loading on the quantities given above. After that, the characters of the temporal variations of the loading are constructed, and the strain loadings' changing with the Azimuth angle (so called strain flower) at some stations in china continent are mapped before and after correcting with the offing data. the global distribution of the loadings are also given in this paper. And then. some analyses and discussion are made detailedly on the results. The results show that the effect of ocean tide loading on the observations in geophysical field can not be ignored; it is of great importance to combine the global tidal data with local ones for loading research; the model of Csr4.0 is best fit for correcting the gravity observations at Wuhan station.The point of this article:On the basis of the gains obtained by the former researches, the oceanic tides loading effects are obtained with the latest precise ocean tidal models and the data of china seas. Nowadays, with the improvement of accuracy of the observations, the oceanic loading effect is more and more important for those observations, especially for that got from the stations located in seacoast. The results in this paper are useful to the correlative observations. The directed one is to serve the Crust movement observation network in China.