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Observed and Calculated M2 Tidal Gravimetric Factors at 15 Stations in the Mainland of China

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Abstract

One important procedure in gravity data processing is making tidal corrections. Sound tidal corrections rely on accurate tidal gravimetric factors. The present study selects data from 12 gPhone gravimeter stations and three superconducting gravimeter stations for the period between 2009 and 2015, distributed across mainland China. Based on these data, the distribution of M2 tidal gravimetric factors over China is obtained. We also estimate the corresponding theoretical values of the M2 wave provided by the DDW99 solid Earth tide model (Dehant et al. in J Geophys Re Solid Earth 104:1035–1058, 1999) and the CSR4.0 ocean tide model (Eanes and Bettadpur in The CSR3. 0 global ocean tide model: diurnal and semi-diurnal ocean tides from TOPEX/POSEIDON altimetry, The University of Texas Center for Space Research, 1996). The results suggest that the measurements and theoretical values of the M2 wave are similar, with an average misfit no greater than 0.6% for most regions of China’s mainland, although the misfit is relatively large, about 1.1%, in northeast China. According to the latest three-dimensional tidal theory and the correction effects on the M2 gravimetric factors at Lhasa, Lijiang, and Wuhan, where the three superconducting gravimeters are located, we select the best-fitting three-dimensional Earth model, GyPSuM (Simmons et al. in J Geophys Res Solid Earth 115:B12, 2010), for mainland China. The theoretical values of the tidal gravimetric factors while considering three-dimensional inhomogeneities are calculated. The results show that the variation in gravimetric factors caused by lateral inhomogeneity across China is from −0.07 to 0.09%.

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Acknowledgements

We thank two anonymous reviewers and the Editor for their helpful comments and suggestions. The ocean tide modes in Table 2 are downloadable from the OSO website via http://holt.oso.chalmers.se/loading/. The Earth models in Table 3 are downloadable from the IRIS website via http://ds.iris.edu/ds/products/emc-Earthmodels/ (Trabant et al. 2012). The atmospheric pressure data are downloadable from the TPDC website via http://www.tpdc.ac.cn/zh-hans/data/8028b944-daaa-4511-8769-965612652c49/. The WPARICET program is downloadable from the ICET website via https://www.astro.oma.be/en/. The SPOTL software is downloadable from the website of https://igppweb.ucsd.edu/~agnew/Spotl/spotlmain.html. This work is supported by the National Natural Foundation of China (Grant no. 41774093, 60164204, 41874003).

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Correspondence to Ziwei Liu.

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Wang, Z., Liu, Z., Fu, G. et al. Observed and Calculated M2 Tidal Gravimetric Factors at 15 Stations in the Mainland of China. Pure Appl. Geophys. 178, 3069–3084 (2021). https://doi.org/10.1007/s00024-021-02777-0

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