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Determination of the long period tidal waves in the GGP superconducting gravity data

机译：GGP超导重力数据中长期潮汐波的确定

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Several results about the long period (LP) tidal waves are obtained by the analysis of series of superconducting gravity data, provided by the Global Geodynamics Project (GGP). The most important result is the determination of a single group called LPMF, composed by all LP tides but representing accurately the parameters of the M_f wave. As the LP tidal generating potential is vanishing at latitudes +-35° 15′52″ we cannot determine accurate tidal amplitude factors for the stations located between +-40° and +-30°. However, it is still possible to obtain tidal residual vectors and compare them with oceanic tidal loading computations. For 15 stations the NAO99 oceanic model is giving a coherent picture. For nine stations with M_f amplitude larger than 3 μgal (1 μgal= 10 nm s~(-2)) a global analysis is obtained by introducing the loading effect of the ocean directly in the observation equations. The mean amplitude factor obtained for LPMF is larger than expected from the models and there is a significant phase lag, showing the imperfection of the tidal oceanic models for M_f. Other new result is the first separate estimation of the parameters of the LP tides, generated by the tidal potential of third degree, dominated by a Lunar declinational monthly wave, called here 3M_(md). Due to their small amplitudes (under 1 μgal) these waves are practically hidden by the noise. Nevertheless, the quality of the data and the flexibility of the VAV analysis method [Venediktov, A.P., Arnoso, J., Vieira, R., 2001. Program VAV/2000 for tidal analysis of unequally spaced data with irregular drift and colored noise. J. Geodetic Soc. Jpn. 47 (1), 281-286; Venedikov, A.P., Arnoso, J., Vieira, R., 2003. VAV: a program for tidal data processing. Comput. Geosci. 29, 487-502.] allow getting significant results, in agreement with the theory of the Earth deformation by the tidal potential of third degree.
机译：通过对由全球地球动力学项目（GGP）提供的一系列超导重力数据的分析，获得了有关长周期（LP）潮汐的一些结果。最重要的结果是确定一个由所有LP潮汐组成但准确代表M_f波参数的称为LPMF的单一群。由于LP潮汐产生势在+ -35°15′52″处消失，因此我们无法确定位于+ -40°和+ -30°之间的测站的准确潮汐振幅因子。但是，仍然有可能获得潮汐残差矢量，并将其与海洋潮汐载荷计算进行比较。对于15个站，NAO99海洋模型给出了连贯的画面。对于M_f振幅大于3μgal（1μgal= 10 nm s〜（-2））的9个站，通过将海洋的载荷效应直接引入观测方程中来进行全局分析。 LPMF的平均振幅因子比模型预期的要大，并且存在明显的相位滞后，表明M_f的潮汐海洋模型不完善。其他新的结果是对LP潮汐参数的第一次单独估计，这是由三度潮汐势所产生的，主要由月球斜度月波（这里称为3M_（md））主导。由于它们的振幅小（小于1微加仑），这些波实际上被噪声隐藏了。然而，数据的质量和VAV分析方法的灵活性[Venediktov，A.P.，Arnoso，J.，Vieira，R.，2001。程序VAV / 2000，用于潮汐分析不均匀漂移的数据和有色噪声。 J.大地测量学。日本。 47（1），281-286； Venedikov，A.P.，Arnoso，J.，Vieira，R.，2003年。VAV：用于潮汐数据处理的程序。计算Geosci。 29，487-502。]允许取得重大成果，与三度潮汐势能引起的地球变形理论一致。

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