液核地球CIP轴的极移和岁差章动  

The wobble and precession-nutation concerning CIP of fluid core Earth

作　　者：张捍卫[1] 许厚泽[2] 王爱生[1] 

机构地区：[1]徐州师范大学国土信息与测绘工程系,江苏徐州221116 [2]中国科学院测量与地球物理研究所,湖北武汉430077

出　　处：《山东理工大学学报（自然科学版）》2005年第1期1-6,共6页Journal of Shandong University of Technology:Natural Science Edition

基　　金：1国家自然科学基金(40374030)(40234039);地球空间环境与大地测量教育部重点实验室资助项目(020915);中国科学院知识创新工程重要方向项目(KZCX3-SW-132)资助.

摘　　要：基于经典的液核地球自转动力学理论,通过引入章动参考系相对惯性空间的运动,建立了液核地球极移和章动的联合动力学方程.由此对CIP轴进行了理论定义,并给出了其极移、岁差和章动的动力学方程.在顾及到5阶岁差章动力矩的情况下,给出了岁差章动的解析表达式.通过推导发现,即使没有核幔边界的耗散耦合,奇数阶岁差章动力矩也使得黄经章动和交角章动出现了异向项,即黄经章动出现了cos项,交角章动出现了sin项.同时还证明了岁差表达式与地球模型无关.本文的理论可为动力大地测量学和天文地球动力学的研究提供理论参考和依据.Based on classical dynamical equation on fluid core Earth rotation, an associated dynamical equation containing both nutation and wooble of Earth rotation has been deduced through introducing motion of nutation frame system with respect to inertial spatial frame. Therefore, the theoretical definition of CIP and its dynamical equation on polar motion and precession-nutation have been given. Considering precession-nutation moment until 5 orders, the expression of precession-nutation of CIP is presented. Theoretical deductions make us know that, even if without dissipative coupling of core and mantle boundary, odd order's precession-nutation moment also caused out-of-phase of longitude and obliquity nutation (namely, there were cosine term in longitude nutation and sine term in obliquity nutation). This characteristic did not involve in previous theory of Earth rotation. At one time, it is proved that the expression of precession is independent of Earth model. Theoretical formulae deduced can be a reference and basis of dynamical geodesy and astrogeodynamics's research.

关 键 词：岁差 黄经 地球模型 核幔边界 大地测量学 天文地球动力学 地球自转 CIP 交角 方程 

分 类 号：P732.6[天文地球—海洋科学] G633[文化科学—教育学]