地球自转的天文地球动力学效应研究(I)——引力位和重力的变化  

Research for Astrogeodynamical Effects of the Earth's Rotation Variation of Gravitational Potential and Gravity

作　　者：张捍卫[1] 许厚泽[1] 郑勇[2] 刘长建[2] 

机构地区：[1]中国科学院测量与地球物理研究所,武汉430077 [2]解放军信息工程大学测绘学院一系,郑州450052

出　　处：《地球物理学进展》2002年第3期424-429,共6页Progress in Geophysics

基　　金：国家自然科学基金项目 (4 0 1740 0 2 )资助

摘　　要：详细讨论了地球自转的天文地球动力学效应 .地极移动和日长变化导致地球引力位系数产生时变特性并引起重力的摄动 .根据理论力学的基本概念 ,导出了由于地球自转变化引起的地球引力位系数变化、重力摄动、垂线偏差和地球形变的表达式 ,并定量地研究了极移和日长变化对测站重力观测值和地球形变的影响 .建议在高精度的空间大地测量中要顾及到地球自转变化引起的一系列效应 .The astrogeodynamical effects of the earth's rotation are discussed in detail. The time-varying feature and the perturbation of gravity are mainly caused by polar motion and change in the length of the day. Based on theoretical mechanics, the expressions of geopotential coefficient variation, gravity's perturbation, vertical deriation and earth's deformation are drived out, and station gravity observations with earth's deformation fluenced by polar motion and change in the length of the day are studied at the same time. A series of effects caused by earth rotation are recommended to be taken into account in the high precision space geodesy.

关 键 词：天文地球动力学效应 地球自转 地球引力位系数 重力变化 地球形变 

分 类 号：P312[天文地球—固体地球物理学]