Determination of Ocean Tide Loading Displacements Using Kinematic PPP

doi:10.11947/j.AGCS.2016.20150327

Abstract

Abstract: In this study, 12 GPS stations' continuous observations from 2007 to 2012 were utilized to determine ocean tide loading (OTL) displacements by kinematic PPP. Through comparison of estimates from kinematic PPP and results predicted by 7 global ocean tide models, one regional model and static PPP, TPXO.7.2, EOT11a, HAMTIDE and NAO99Jb were found having smaller RMS misfits than other models. Comparing the RMS misfits of static PPP results with that of models, we found that they have similar patterns except for the east direction of S₂, K₂ and K₁ and north direction of M₂ and N₂, in which the static PPP's RMS misfits are a little bit larger than models'. Furthermore, apart from K₁ and K₂, the RMS misfits between Kinematic PPP and model estimates are less than 1 mm and 2.5 mm in horizontal and vertical directions, which reach the same precision of static PPP. Obvious system bias was found between the results of kinematic PPP and NAO99Jb model. After subtracting the system bias, all constituents' RMS misfits decreased evidently, especially for K₁ constituent's vertical component, reducing from 16.4 mm to 1.3 mm. Moreover, by comparing the harmonic parameters estimated from tide gauge data and ocean tide models, we found results from gauge data also agree best with TPXO.7.2, EOT11a, HAMTIDE and NAO99Jb, which demonstrates that kinematic PPP is capable of determining OTL displacements and also indicates that these models are more applicable for Hong Kong.

Key words: kinematic PPP, ocean tide loading displacement, ocean tide model, tide gauge

CLC Number:

P228

ZHANG Xiaohong, MA Lan, LI Pan. Determination of Ocean Tide Loading Displacements Using Kinematic PPP[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(6): 631-638.

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