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A global experimental model for gravity tides of the Earth

机译：地球重力潮的全球实验模型

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The long-term, continuous and high-quality tidal gravity data, recorded with the superconducting gravimeters (SGs) at 19 stations in the Global Geodynamics Project (GGP), were simultaneously used to investigate the global pattern of the tidal gravity variations. The atmospheric effects were removed from the gravity observations by using the simultaneous pressure records at the stations. A total of six global co-tidal models were employed to remove the loading effects of oceanic tides. The resonance parameters of the Earth's free core nutation (FCN), as well as the spheroidal constant components in the gravimetric factors of waves O_1 and M_2, were accurately retrieved. As a result, a global experimental model for gravity tides (GEMGT) was developed, considering the nearly diurnal resonance and the latitude-dependence of the gravimetric amplitude factors. The final results indicate that the mean discrepancy of the four main tidal waves (i.e. O_1, K_1, M_2 and S_2) between the GEMGT and SG observations is less than 0.2% on average. The GEMGT is in good agreement with the theoretical models based on the inelastic non-hydrostatic equilibrium Earth models [Dehant, V., Defraigne, P., Wahr, J., 1999. Tides for a convective Earth. J. Geophys. Res. 104, 1035-1058; Mathews, P.M., 2001. Love numbers and gravimetric factor for diurnal tides. J. Geodetic Soc. Jpn. 46 (4), 231-236] with a mean discrepancy less than 0.15%. However, the GEMGT is in closer accordance with the theoretical model given by Mathews [Mathews, P.M., 2001. Love numbers and gravimetric factor for diurnal tides. J. Geodetic Soc. Jpn. 46 (4), 231-236] for the diurnal tides while it is in closer agreement with one obtained by Dehant et al. [Dehant, V., Defraigne, P., Wahr, J., 1999. Tides for a convective Earth. J. Geophys. Res. 104, 1035-1058] for the semi-diurnal tides.
机译：在全球地球动力学项目（GGP）的19个站点上，用超导重力仪（SGs）记录的长期，连续和高质量的潮汐重力数据，也同时用于调查潮汐重力变化的整体模式。通过使用站点的同时压力记录，从重力观测中消除了大气影响。总共使用了六个全球共潮模型来消除海洋潮汐的负荷效应。准确地检索了地球自由核章动（FCN）的共振参数以及波O_1和M_2的重量因子中的球体常数分量。结果，考虑了近日共振和重力振幅因子的纬度依赖性，开发了一个全球重力潮汐实验模型（GEMGT）。最终结果表明，GEMGT和SG观测值之间的四个主要潮汐（即O_1，K_1，M_2和S_2）的平均差异平均小于0.2％。 GEMGT与基于非弹性非静水力平衡地球模型的理论模型[Dehant，V.，Defraigne，P.，Wahr，J.，1999.对流地球的潮汐。 J.地球物理。 Res。 104，1035-1058;马修斯（Mathews），下午，2001年。日潮的爱情数字和重量因子。 J.大地测量学。日本。 46（4），231-236]，平均差异小于0.15％。但是，GEMGT与Mathews [Mathews，P.M.，2001.每日潮汐的爱数和重量因子”所给出的理论模型更为一致。 J.大地测量学。日本。 [46（4），231-236]的昼夜潮汐与Dehant等人获得的日潮更为一致。 [Dehant，V.，Defraigne，P.，Wahr，J.，1999。对流地球的浪潮。 J.地球物理。 Res。 104、1035-1058]。

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