Adaptability of the ocean and earth tidal models based on global observations of the superconducting gravimeters  

作　　者：Ducarme Bernard Vandercoilden Leslie 

机构地区：[1]Royal Observatory of Belgium, 3av. Circulaire, B-1180, Brussels, Belgium

出　　处：《Science China Earth Sciences》2005年第11期1859-1869,共11页中国科学（地球科学英文版）

基　　金：supported jointly by the Knowledge Innovation Project(Grant No.KZCX3-SW-131);the Hundred Talents Program,the Chinese Academy of Sciences,the National Natural Science Foundation of China(Grant No.40374029);the Key International Scientific Cooperation Project via the Ministry of Sciences and Technology of China(Grant No.2002CB713904).

摘　　要：The adaptability of recent ocean tidal models and Earth tidal models is investigated comprehensively by means of 22 high precision tidal gravity observation series at 20 stations of the Global Geodynamics Project. Careful preprocessing of the original observations was carried out using international standard algorithms and the tidal gravity parameters were computed. The gravity load vectors of 8 main constituents are obtained based on loading computation theory and various global ocean models. The loading corrections of 14 secondary constituents are obtained based on a two-dimensional interpolation technique. Considering different characteristics of the wave amplitude, a method of “non-identical weighted mean” is developed for computing the av-eraged observed residual and remaining residual vectors at each station. The efficiency of the loading correction and the discrepancy between corrected amplitude factors and theoretical ones are analyzed. Meanwhile the calibration problem of the instruments is also discussed. After loading correction, the averaged tidal gravity parameters for all stations are obtained. The results show that the discrepancies between the global mean amplitude factors and theoretical values are less than 0.3%, the largest calibration error of the instruments is less than 0.5%. On the other hand, there are indications that the slight phase advance of K1 with respect to O1 in Mathews’ theory could be verified by ground based tidal gravity observations.The adaptability of recent ocean tidal models and Earth tidal models is investigated comprehensively by means of 22 high precision tidal gravity observation series at 20 stations of the Global Geodynamics Project. Careful preprocessing of the original observations was carried out using international standard algorithms and the tidal gravity parameters were computed. The gravity load vectors of 8 main constituents are obtained based on loading computation theory and various global ocean models. The loading corrections of 14 secondary constituents are obtained based on a two-dimensional interpolation technique. Considering different characteristics of the wave amplitude, a method of “non-identical weighted mean” is developed for computing the av-eraged observed residual and remaining residual vectors at each station. The efficiency of the loading correction and the discrepancy between corrected amplitude factors and theoretical ones are analyzed. Meanwhile the calibration problem of the instruments is also discussed. After loading correction, the averaged tidal gravity parameters for all stations are obtained. The results show that the discrepancies between the global mean amplitude factors and theoretical values are less than 0.3%, the largest calibration error of the instruments is less than 0.5%. On the other hand, there are indications that the slight phase advance of K1 with respect to O1 in Mathews’ theory could be verified by ground based tidal gravity observations.

关 键 词：superconducting gravimeters  GLOBAL GEODYNAMICS Project  determination of the TIDAL gravity parameters verification of the GLOBAL OCEAN and EARTH TIDAL models 

分 类 号：P731.23[天文地球—海洋科学]