Abstract:

There are several earth gravitational models (EGM). Gravity anomalies, vertical deflections, and gravity potential can be computed from these models. The question arises which model is the most accurate model in East sea. To answer this question, the paper presents four earth gravitational models: EGM96; EGM2008; GO_CONS_EGM_DIR_2I; GOCE-DIR4. The computational method of the gravity anomalies is achieved from the gravitational coefficients of the spherical harmonic function. These computed results of the gravity anomalies from the earth gravitational models are compared with the marine gravity observations. The results of comparison show that the Earth Gravitational Model 2008 (EGM2008) is the most accurate model in the East Sea. The computed gravity anomalies from this model have standard deviation of 4.9mgal. However, the gravity deviations contain the system errors.