CALCULATION AND ANALYSIS OF THE HEIGHT ANOMALY AND THE DEFLECTION OF VERTICAL IN AN OCEAN AREA

By the analysis of a practical calculation, this paper describes, for the first time in China, the gravimetric method on the calculation of the height anomaly and the deflection of vertical in the ocean by Stokes' and Vening Meinesz's formula.There are 84 calculation points distributed uniformlic in a calculated area of 2°×2° in the Mid-Pacific.In the course of the calculation, the gravimetric data measured by us, the 1°×1° mean gravity data published in other countries and the 25-ordeic gravitational coefficients of GEM8 were used.The results (Fig.2b) show that the calculated area is an uplift of the geoid, with a mean height anomaly of 42 m, the maximum being 45 m and the minimum 39 m.In the whole calculated area, the variation of the deflection of vertical is rather small, with the maximum 7"·1 and the minimum -0"·2.The major causes of the calculation errors are pointed out and the calculation results are compaired with the data from the satellite altimeter.