Analysis of the characteristics of the harmonics coefficient J_2 of the Earth's gravity field in different periods

作     者：QU WeiJing WU Bin 

作者机构：Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Graduate University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2012年第57卷第14期

页      面：1626-1630页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the National Natural Science Foundation of China (11003036,11173049) the Mapping Foundation Study of State Bureau of Surveying and Mapping (10-01-13) Science & Technology Commission of Shanghai Municipality(06DZ22101) 

主　　题：地球重力场 谐波系数 特征 卫星激光测距 长期变化 季节变化 年际变化 形状约束 

摘      要：The characteristics of the geopotential coefficient J2 in different periods are analyzed using satellite laser ranging data spanning the last 27 *** satellites used in the analysis are Lageos1 and *** variations in J2 are obtained by determining the dynamic *** results show that there are strong seasonal and long-term *** different data spans,the seasonal variations agree well in terms of both amplitude and *** all the data,the amplitude and phase of the annual term are 2.5 10-10 and 127°,respectively,while the amplitude and phase of the semiannual term are 0.94 10-10 and 213°,*** the case of long-term variation,the secular variation in J2(J2) is-2.2 10-11 a-1 from 1984 to 2010.J2 differs for the different periods because of interannual variations,such as the 1998 anomaly.Another anomaly may have taken place during *** the cause of the anomaly is unknown,it is an important observational constraint on the shape of the Earth.