Abstract We investigate a nearly 8-year record (2010–2018) of the superconducting gravimeter OSG-060 located at Djougou (Benin, West Africa). We first perform a tidal analysis with ET34-ANA v7.1 software that leads to the gravimetric amplitude and phase factors for all separable waves according to the available time duration. We test nine different ocean tide models for the main eleven tidal constituents (Ssa, Mm, Mf, Q1, O1, P1, K1, N2, M2, S2, K2). After correction for ocean tidal loading we obtain the real and imaginary parts of the residual vector. We also investigate atmospheric loading which is dominated in this equatorial location by the thermal waves S1 and S2 that are modulated in amplitude by annual and semi-annual components. After correction for ocean loading, we test different air pressure corrections on the tidal gravimetric factors for the waves Sa, Ssa, S1 and S2. We show the rather large discrepancy that exists between the classical single admittance pressure reduction and a hybrid model using global atmospheric models everywhere except in the local zone where the model pressure is replaced by the observed pressure.

中文翻译：

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使用来自 Djougou（贝宁，西非）超导重力仪 OSG-060 的 8 年记录（2010-2018）研究固体地球潮汐、海洋和大气载荷

摘要 我们调查了位于 Djougou（贝宁，西非）的超导重力仪 OSG-060 的近 8 年记录（2010-2018）。我们首先使用 ET34-ANA v7.1 软件进行潮汐分析，根据可用的持续时间得出所有可分离波的重力振幅和相位因子。我们针对 11 种主要潮汐成分（Ssa、Mm、Mf、Q1、O1、P1、K1、N2、M2、S2、K2）测试了九种不同的海洋潮汐模型。在对海洋潮汐载荷进行校正后，我们获得了残差矢量的实部和虚部。我们还研究了在这个赤道位置由热波 S1 和 S2 主导的大气载荷，这些热波在振幅上受到年度和半年度分量的调制。修正海洋载荷后，我们对波浪 Sa、Ssa、S1 和 S2 的潮汐重力系数测试了不同的气压修正。我们展示了经典的单导纳压降与使用全球大气模型的混合模型之间存在相当大的差异，除了模型压力被观测压力取代的局部区域。