应用经验正交函数分析方法研究地球重力场时变特征

Analysis on the Earth Gravity Temporal Variation Based on the Empirical Orthogonal Function Method

利用Grace(Gravity Recovery And Climate Experiment)106个月连续重力异常数据,基于经验正交函数分析方法,分析了重力异常时变特征,得出了地球重力场时变信号主要起源于海水质量的移动,位于南纬40°与北纬40°带之间的结论。

Using global gravity anomaly data which were calculated from 106 months of continuous Grace（Gravity Recovery And Climate Experiment） data,based on empirical orthogonal function method,time-varying characteristics of the gravity anomaly is analyzed.The results show that： the temporal variation gravity field signal originates mainly from the sea water movement,and mostly is located at the zonal between south latitude 40 degree and north latitude 40 degree.