地球内核的动力学理论及章动效应  

Dynamic theory of the Earth's inner core and nutation efficiency

作　　者：张捍卫[1] 许厚泽[1] 郑勇[2] 张超[2] 

机构地区：[1]中国科学院测量与地球物理研究所,湖北武汉430077 [2]郑州信息工程大学测绘学院大地测量系,河南郑州450052

出　　处：《云南大学学报（自然科学版）》2002年第4期294-298,共5页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目 ( 4 0 1740 0 2 )

摘　　要：地球固体内核与其其余部分之间的引力和压力的耦合作用将引起一内力矩 ,内核通过这一力矩影响岩石圈相对惯性空间的定向 .讨论了一个弹性无海洋、球形分层的内核地球章动理论 ,将内核的作用明确地反映在公式中 .并依据Mathewsetal的内核地球动力学理论 ,讨论了归一化章动振幅的Mathews形式和Wahr形式的应用 ;通过PREM地球模型检测了内核对章动振幅的影响 ,由此发现本文的结果与Mathewsetal的结果存在一定的差异 。There exist relationship between the Earth's inner core and the Earth's rotation.Because of the inner core of the Earth,there will have two new nutation modes related to the Earth's rotation,i.e.a prograde free core nutation (PFCN) mode and a inner core wobble (ICW) mode.Based on the inner core nutation theory of the Earth by Mathew's et al the applications of normaliged nutation amplitude of Mathew's type and Whar's one are discussed,By the PREM Earth's model,the influence of the inner core to the vibration rangeof nutation is checked,the main solution is that the inner core has effects to the main nutation terms in 0.1?mas,which is coincide with recent observation precision.

关 键 词：地球内核 动力学 章动效应 地球自转 自由核章动 内核摆动 

分 类 号：P541[天文地球—构造地质学]