海潮负荷效应对我国及周边IGS站的影响

针对近海区域海潮变化复杂且海潮负荷效应显著,而全球海潮模型在近海区域精度较低的问题,该文提出了将全球海潮模型NAO.99b和区域模型osu.chinasea.2010相结合,分析海潮对中国大陆及周边地区IGS站的影响。使用GAMIT软件解算IGS站实测数据,通过海潮负荷计算软件SPOTL对解算结果进行改正,并对改正效果进行对比和分析。结果表明,海潮负荷对中国及周边区域站点的影响主要体现在垂直方向,对一些站点的影响可以达到厘米级;海潮负荷对站点坐标的改正效果明显,特别是日本的种子岛站改正效果接近30%;站点改正效果从沿海到内陆逐渐减弱。

Effects of ocean tide loading on IGS sites in China and surrounding areas

According to the fact that the changing tides in offshore areas are complex and ocean loading effects are also striking,and the precision of global ocean models in coastal areas is relatively low,this paper presented the combination of global tide model NAO.99b and regional model osu.chinasea.2010 to analyze the effects of ocean tide on IGS sites in the mainland of China and its surrounding areas.The IGS data were calculated by GAMIT software and the corrected results corrected by SPOTL software were compared and analyzed with the IGS data.The results showed that effects of ocean tide loading on China and surrounding areas were mainly reflected in the vertical direction,and several sites could reach centimeter level.The correcting effects of ocean tide on site coordinates were obvious and gradually weaken from the coast to the inland,especially those of Japanese Tanegashima approximated to 30％.