武汉台长周期重力固体潮观测的海潮负荷改正  

OCEAN TIDE LOADING CORRECTION ON LONG PERIOD EARTH TIDAL GRAVITY OBSERVATION AT WUHAN STATION

作　　者：周江存[1] 孙和平 

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

出　　处：《大地测量与地球动力学》2007年第6期28-32,共5页Journal of Geodesy and Geodynamics

基　　金：中国科学院知识创新重要方向项目(KXCXZ-YW-133);国家基金委重点项目(40730316);国家自然科学基金(40574034)

摘　　要：利用武汉超导重力观测资料,采用VAV和Eterna潮汐分析软件获得的长周期重力固体潮潮汐参数,以及TPXO5、TPXO6、TPXO7、NAO99和FES04海潮模型进行了重力固体潮观测的海潮负荷改正。结果表明,Mm和M f潮波的观测残差主要是由海潮负荷引起的,改正后的振幅因子更加接近于理论值,与理论值的差异分别从3.4%和2.5%降到了0.16%和0.12%。而振幅相对较小的长周期潮波由于观测信号的信噪比较低,目前还很难准确测定潮汐参数,通过对这些潮波的海潮负荷改正也验证了这一点。Applying the long term tidal parameters gravity observations with superconducting gravimeter at gravity obtained with the VAV and Etema softwares, the Wuhan station and on the ocean tide models：TPXOS, TPXO6, TPXO7, NAO99 and FESO4. We have made the ocean tide loading correction to these observations. The numerical results show that the residuals of constituents of Mm and Mf are mainly caused by ocean tide loading. The corrected amplitude factors are closer to the theoretical ones of which the differences decrease from 3.4% and 2. 5% to 0.16% and 0.12% respectively. Due to the low signal noise ratio of the long-period constituents with relatively small amplitudes, the tidal parameters of these constituents are difficult to be measured accurately at present. This is also proved by the results of ocean tide loading correction.

关 键 词：长周期重力固体潮 潮汐参数 海潮负荷改正 超导重力仪 海潮模型 

分 类 号：P312.4[天文地球—固体地球物理学]