重力场长周期变化的观测与理论结果比较  

Comparison of Observed and Predicted Long-period Changes in the Earth's Gravity Field

作　　者：朱耀仲[1] 

机构地区：[1]中国科学院测量与地球物理研究所,武汉市徐东路54号430077

出　　处：《武汉大学学报（信息科学版）》2001年第6期539-543,共5页Geomatics and Information Science of Wuhan University

基　　金：中科院知识创新工程资助项目 (KZCX2_10 6 ) ;国家攀登计划资助项目 ( 970 2 310 0 3)

摘　　要：利用Chandler摆动周期作为约束 ,估计了地幔滞弹性对地球二阶带谐响应系数κ、带谐位系数J2 和卫星轨道升交点Ω的影响 ,理论预测的长周期潮汐参数被用来与人卫激光测距 (SLR)观测结果进行比较。结果表明 ,SLR确定的长周期潮汐解已能检测到地幔滞弹性的影响。考虑地幔滞弹性和非平衡海洋潮汐效应后 ,理论预测的 1 8.6a潮汐参数与SLR潮汐解基本相符。The effects of mantle anelasticity on the Earth's second_degree zonal response coefficient,the zonal geopotential coefficient and the orbital node of geodetic satellites are assessed by using the period of the Chandler wobble as a constraint.The theoretically_predicted parameters for the long_period tides are used to compare the results obtained by satellite laser ranging (SLR) measurements to near_Earth geodetic satellites.The results show that the long_period tide solutions determined by SLR can detect the effect of mantle anelasticity.After taking into account the effects of mantle anelasticity and non_equilibrium ocean tide,the theoretical predicted parameters for the 18.6 a tide are in general agreement with the SLR tide solution.

关 键 词：重力场 潮汐 地幔滞弹性 人卫激光测距 大地测量学 长周期变化 

分 类 号：P223[天文地球—大地测量学与测量工程] P312[天文地球—测绘科学与技术]