Statistical property of the Chandler wobble excitation function  

作　　者：LIAODechun LIAOXinhao ZHOUYonghong 

机构地区：[1]ShanghaiAstronomicalObservatory,ChineseAcadmyofSciences,Shanghai200030,China [2]NationalObservatories,ChineseAcademyofSciences,Beijing100012,China [3]UnitedCenterforAstro-geodynamicsResearch,ChineseAcademyofSciences,Shanghai200030,China

出　　处：《Chinese Science Bulletin》2004年第22期2348-2353,共6页

摘　　要：The Chandler wobble excitation function (hereinafter, geodetic excitation) is obtained by removing the seasonal components and low frequency components with periods from several years to decades from the polar motion excitation function derived from SPACE2002 series. The geophysical excitation functions of the individual AAM, OAM, HAM, and two combined excitations of the AAM + OAM and AAM + OAM + HAM at 1d, 5d, 1m and 3m in- tervals are statistically tested for the hypothesis of the nor- mality, and then tested for the hypotheses of identical distri- bution between the geodetic and the geophysical excitations. The results show that, among the total 16 components of the two combined excitation functions at 1d, 5d, 1m and 3m in- tervals,most follow random normal processes, the hy- potheses of identical distribution between the geodetic exci- tation and the two combined excitation are acceptable, while most of the hypotheses of identical distribution between the geodetic excitation and the individual excitations of the AAM, OAM, and HAM are rejectable. These results elucidate from a new point of view, that the excitations from AAM, OAM, and HAM are the main sources of the Chandler wobble, and the Chandler wobble excitation function is of a random normal property.The Chandler wobble excitation function (hereinafter, geodetic excitation) is obtained by removing the seasonal components and low frequency components with periods from several years to decades from the polar motion excitation function derived from SPACE2002 series. The geophysical excitation functions of the individual AAM, OAM, HAM, and two combined excitations of the AAM + OAM and AAM + OAM + HAM at 1d, 5d, 1m and 3m in- tervals are statistically tested for the hypothesis of the nor- mality, and then tested for the hypotheses of identical distri- bution between the geodetic and the geophysical excitations. The results show that, among the total 16 components of the two combined excitation functions at 1d, 5d, 1m and 3m in- tervals,most follow random normal processes, the hy- potheses of identical distribution between the geodetic exci- tation and the two combined excitation are acceptable, while most of the hypotheses of identical distribution between the geodetic excitation and the individual excitations of the AAM, OAM, and HAM are rejectable. These results elucidate from a new point of view, that the excitations from AAM, OAM, and HAM are the main sources of the Chandler wobble, and the Chandler wobble excitation function is of a random normal property.

关 键 词：钱德勒颤动 大气角动量 海洋角动量 激发函数 统计分布 非参数试验 

分 类 号：P401[天文地球—大气物理学与大气环境] P733[天文地球—大气科学及气象学]