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- W2014092509 abstract "Abstract The gravimetric parameters of the gravity pole tide are the amplitude factor δ , which is the ratio of gravity variations induced by polar motion for a real Earth to variations computed for a rigid one, and the phase difference κ between the observed and the rigid gravity pole tide. They can be estimated from the records of superconducting gravimeters (SGs). However, they are affected by the loading effect of the ocean pole tide. Recent results from TOPEX/Poseidon (TP) altimeter confirm that the ocean pole tide has a self-consistent equilibrium response. Accordingly, we calculate the gravity loading effects as well as their influence on the gravimetric parameters of gravity pole tide at all the 26 SG stations in the world on the assumption of a self-consistent equilibrium ocean pole tide model. The gravity loading effect is evaluated between 1 January 1997 and 31 December 2006. Numerical results show that the amplitude of the gravity loading effect reaches 10 −9 m s −2 , which is larger than the accuracy (10 −10 m s −2 ) of a SG. The gravimetric factor δ is 1% larger at all SG stations. Then, the contribution of a self-consistent ocean pole tide to the pole tide gravimetric parameters cannot be ignored as it exceeds the current accuracy of the estimation of the pole tide gravity factors. For the nine stations studied in Ducarme et al. [Ducarme, B., Venedikov, A.P., Arnoso, J., et al., 2006. Global analysis of the GGP superconducting gravimeters network for the estimation of the pole tide gravimetric amplitude factor. J. Geodyn. 41, 334–344.], the mean of the modeled tidal factors δ m = 1.1813 agrees very well with the result of a global analysis δ CH = 1.1816 ± 0.0047 in that paper. On the other hand, the modeled phase difference κ m varies from −0.273° to 0.351°. Comparing to the two main periods of the gravity pole tide, annual period and Chandler period, κ m is too small to be considered. Therefore, The computed time difference κ L induced by a self-consistent ocean pole tide produces a negligible effect on κ m . It confirms the results of Ducarme et al., 2006, where no convincing time difference was found in the SG records." @default.
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- W2014092509 date "2008-05-01" @default.
- W2014092509 modified "2023-09-22" @default.
- W2014092509 title "Loading effect of a self-consistent equilibrium ocean pole tide on the gravimetric parameters of the gravity pole tides at superconducting gravimeter stations" @default.
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- W2014092509 doi "https://doi.org/10.1016/j.jog.2007.11.003" @default.
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