Abstract
Abstract. Due to lack of regional data constraints, all global ocean tide models are not accuracy enough in offshore areas around China, also the displacements predicted by different models are not consistency. The ocean tide loading effects have become a major source of error in the high precision GPS positioning. It is important for high precision GPS applications to build an appropriate regional ocean tide model. We first process the four offshore GPS tracking station’s observation data which located in Guangdong province of China by using PPP aproach to get the time series. Then use the spectral inversion method to acquire eigenvalues of the Ocean Tidal Loading. We get the estimated value of not only ~12hour period tide wave (M2, S2, N2, K2) but also ~24hour period tide wave (O1, K1, P1, Q1) which has not been got in presious studies. The contrast test shows that GPS estimation value of M2, K1 is consistent with the result of five famous glocal ocean load tide models, but S2, N2, K2, O1, P1, Q1 is obviously larger.
Highlights
With the improvement of positioning accuracy, GPS has been used in many researches such as current crustal movement monitoring and continental dynamics
Corrections of ocean tide load displacements are usually obtained by discrete convolution integrals of the ocean tide model and the Green's function based on the earth model (Farrell, 1972)
The results show that the differences in ocean load displacement calculated by different models are 1 to 2 mm in the coastal area, for the IGS stations, the different root-meansquare error of the load displacement obtained by the tide model can reach 3 mm in the vertical direction and 8 mm in some coastal areas
Summary
With the improvement of positioning accuracy, GPS has been used in many researches such as current crustal movement monitoring and continental dynamics. Vey et al (Vey et al ., 2002) presented results from a GPS experiment studying crustal displacements caused by ocean loading effects and their impact on zenith tropospheric delay estimates in France. Vergnolle (Vergnolle et al.,2008) carried harmonic analysis by useing 14 GPS stations which located in northwestern france, found that the tide load correction differences between GPS inversion results and FES2004 model are 2~7mm, the amplitude difference of some tidal wave components is only sub-millimeter; Ito et al (Ito et al.,2009) use Japan's dense GPS array and ultra guided gravimeter data extraction M2, found that the initial phase and amplitude given by global tide model and GPS observation are different.Yuan et al ( Yuan et al.,2010) used several years of GPS data in Hong Kong calculating the eight major ocean tide components. Analysis the presion of ‘new’ ocean tide model
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