不同海潮模型对GNSS站负荷位移计算的影响

The Load Effect of Ocean Tide Models on Displacement at the GNSS Station

基于古登堡平均地球模型和积分格林函数方法,利用中国近海海潮模型Chinasea 2010、Naoregional1999和全球海潮模型EOT11a,计算中国沿海GNSS连续运行站上的海潮位移负荷影响,并对其均方根RMS及和方根RSS进行综合分析。结果表明,2种近海模型分潮波位移负荷差异水平分量大部分为亚mm级,垂直分量普遍为mm级,最大达5.8mm;Chinasea 2010模型比Naoregional 1999模型在中国海域覆盖面积大,2种模型在黄海和东海海域差异较大,在渤海和南海海域差异较小;模型差异与测站位置及潮波频率均有关系,应比较观测资料的负荷改正效果,择优采用适宜本区域的模型。

In view of the Gutenberg-Bullen average earth model and the integral Green＇s function,load effects of ocean tide models on displacement at the GNSS continuous operation reference station along China＇s coastline are calculated with the two China regional ocean tide models and global ocean tide model EOT11 a.Furthermore,the root mean square（RMS）and root sum square（RSS）are comprehensive analyzed.The results show that most of the differences of horizontal displacement loading for the two models are in sub-millimeter,with millimeter magnitude for almost all the vertical displacement loading with a maximum of 5.8mm.Meanwhile,the coverage area of Chinasea 2010 in the China Sea is larger than Naoregional 1999.There is a great difference between the two models in the Yellow Sea and the East China Sea,but in the Bohai Sea and the South China Sea the difference is small.As the differences among models are relevant to the station location and tidal wave frequency,we should compare the load correction of data and adopt the preferable model suitable for the particular studied areas.