用东海和南海潮汐资料修正全球海潮模型对中国及邻区重力场负荷计算的影响  

INFLUENCE OF THE MODIFIED GLOBAL OCEAN TIDE MODEL WITH LOCAL TIDES OF EAST AND SOUTH CHINA SEAS ON LOAD GRAVITY IN CHINA AND ITS NEIGHBOR AREA

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：《地震学报》2005年第3期332-338,355,共7页Acta Seismologica Sinica

基　　金：中国科学院知识创新工程重要方向性项目(KZCX3SW131);百人计划项目;国家自然科学基金项目(40374029)联合资助

摘　　要：利用11个全球海潮模型和中国东海及南海近海潮汐资料,计算了海潮负荷对中国及邻区重力场的影响,进而讨论了用近海潮汐资料修正全球海潮模型对负荷结果的影响.结果表明,用近海潮汐资料修正全球海潮模型对沿海地区的负荷计算影响较大,因此在计算海潮负荷对沿海台站的影响时,必须顾及近海潮汐效应.计算M2波海潮负荷时,选择CSR4.0,FES02,GOT00,NAO99和ORI96海潮模型,则对于内陆大部分台站负荷的近海效应在0.1×10-8m/s2量级;而计算O1波时,如选择AG95或CSR3.0模型,则在0.05×10-8m/s2量级.这说明模型中的各个潮波在我国沿海的准确性并不是一致的,因此模型的选择是比较复杂的.By using 11 global ocean tide models and tidal gauge data obtained in the East China Sea and South China Sea, the influence of the ocean loading on gravity field in China and its neighbor area is calculated in this paper. Further-more, the differences between the results from original global model and modified models with local tides are discussed based on above calculation. The comparison shows that the differences at the position near the sea are so large that the local tides must be taken into account in the calculation. When the global ocean tide models of CSR4.0, FES02, GOT00, NAO99 and ORI96 are chosen, the local effect for M_2 is less than 0.10×10 -8 m/s2 over the area far away from sea. And the local effect for O_1 is less than 0.05×10 -8 m/s2 over that area when choosing AG95 or CSR3.0 models. This numerical result demonstrates that the choice of model is a complex problem because of the inconsistent accuracy of the models over the areas of East and South China Seas.

关 键 词：全球海潮模型 近海海潮资料 修正 海潮负荷 

分 类 号：P731.23[天文地球—海洋科学] P312.1