不同海潮模型对中国沿海区域海潮负荷位移改正影响分析

选取FES2004、EOT11a、TPXO7.2和Chinasea2010等4个海潮模型，首先通过矢量差评价不同海潮模型的潮波参数差异，然后利用中国大陆构造环境监测网络23个沿海测站的GNSS连续观测数据，通过计算不同海潮模型改正前后GNSS时间序列的wRMS，评价基于不同海潮模型的海潮负荷位移改正的有效性。结果表明，不同海潮模型的潮波参数存在mm级差异，且沿海区域差异远比内陆区域显著。此外，海潮负荷改正对中国沿海区域测站坐标时间序列wRMS影响较大，大部分测站坐标时间序列进行海潮负荷改正后，wRMS减小10%~70%；改正后wRMS改善幅度与测站所属区域有关，东海沿岸测站wRMS的改善较渤海、黄海和东海沿岸测站更显著，可减小50%以上；wRMS改善程度的模型间差异为1%~2%，其中基于FES2004模型的改正对序列wRMS的影响最大，可达67.5%。

Effects of Different Ocean Tide Models on OTL Correction in China’s Coastal Areas

This paper investigates effects of different tide models on ocean tide loading displacements in coastal areas of China. We use GNSS continuous observation data from 23 coastal CMONOC stations and four ocean tide models--FES2004, EOT11a, TPXO7.2 and Chinasea2010. Firstly, tide wave parameters of the four ocean tide models are calculated, showing that discrepancies of tide wave parameters among different tide models can reach the centimeter-level in the up direction. Then we apply ocean tide loading corrections to the coordinate time series of 23 stations using tide wave parameters of these ocean tide models respectively. Results indicate that ocean tide loading correction has a great impact on wRMS of the coordinate time series. For most stations, wRMS is reduced by 10%~70% after correction. Compared with stations in other investigated coastal areas, the reduction of wRMS in the east China sea coastal area, which can be more than 50%, is most significant. Among four ocean tide models, the correction based on FES2004 is more remarkable, with wRMS reduction reaching 67.5%.