武汉超导重力仪观测最新结果和海潮模型研究  

Latest observation results from superconducting gravimeter at station Wuhan and investigation of the ocean tide models

作　　者：孙和平 许厚泽[1] 周江存[1] 陈晓东[1] 徐建桥[1] 周百力[1] 郝兴华[1] 刘明[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室,武汉430077

出　　处：《地球物理学报》2005年第2期299-307,共9页Chinese Journal of Geophysics

基　　金：中国科学院知识创新工程重点项目 (KZCX3_CW_13 1) ;百人计划和国家自然科学基金项目 (4 0 3 740 2 9)联合资助

摘　　要：利用武汉台站GWR_C0 32超导重力仪观测资料,在对原始数据进行有效预处理的基础上作调和分析,获得反映地球内部介质特征的重力潮汐参数.基于卫星测高技术和有限元方法同时考虑验潮站数据作约束条件获得的多个全球海潮模型,利用负荷理论和数值褶积积分技术计算了重力负荷,对周日和半日频段内的重力潮汐参数实施负荷改正,提出了“负荷改正有效性”概念,研究了全球海潮模型适应性.数值结果说明,海潮改正的有效性高达91% (O1 ,NAO99)和92 % (M2 ,ORI96 ) .基于11个海潮模型对主波(O1 ,K1 ,M2 和S2 )的负荷改正说明平均有效性为(86 % ,70 % ,73%和84 % ) ,振幅因子与理论模型间的差异分别从(2 12 % ,1 5 5 % ,1 16 %和0 80 % )降到(0 31% ,0 39% ,0 34%和0 0 8% ) ,同时还说明利用NAO99和ORI96全球海潮模型能获得比其他模型更佳的负荷改正效果.文章还利用国际地球动力学计划网络其他7个台站的超导重力仪观测研究了全球海潮模型的适定性问题,结果说明不同模型中不同潮波具有明显的区域特点,早期构制的SCW80全球海潮模型仍可作为大地测量研究中的重要参考模型.Using observations registered with superconducting gravimeter GWR-C032 at station Wuhan, the tidal gravity parameters reflecting the characteristics of the Earth's interior medium are obtained based on the harmonic analysis after preprocessing of the raw data. Meanwhile the gravity loading is calculated using loading theory and a numerical integral convolution technique based on various global ocean tide models developed by methods of the altimetry technology and finite element method with consideration of tidal gauge data as constraints. The loading corrections are carried out to tidal gravity parameters in diurnal and semidiurnal wave bands respectively and the new ideal of the “loading correction effectiveness' is developed in order to investigate the adaptability of global ocean tide models. The numerical results show that the efficiencies of loading correction reach to 91%(O 1, NAO99) and 92%(M 2, ORI96) for instance. The average efficiencies of the loading corrections obtained with 11 oceanic models for four main constituents (O 1, K 1, M 2 and S 2) are given as 86%, 70%, 73% and 84% respectively. And the discrepancies between the amplitude factors and the theoretical values decrease from(2.12%, 1.55%, 1.16% and 0.80%) to (0.31%, 0.39%, 0.34% and 0.08%) respectively. The comparison among various ocean models shows also that the efficiency of the loading correction when using NAO99 and ORI96 models is higher than that when using other models. Additionally, other observations obtained with superconducting gravimeters at seven stations in a network of the Global Geodynamic Project are also adopted to investigate the adaptability of the global ocean models. The results show that there exist obvious local tidal characteristics for different constituents in different ocean models and the earlier constructed SCW80 ocean model can still be used as an important reference in geodesy research domain.

关 键 词：超导重力仪 最新潮汐重力结果 海潮负荷改正 海潮模型适定性 

分 类 号：P312[天文地球—固体地球物理学]