Determination of gravimetric parameters of the gravity pole tide using observations recorded with superconducting gravimeters |
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| Institution: | 1. Key Laboratory of Dynamical Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Xudong Street 340, Wuhan 430077, China;2. Graduate School of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China;3. Department 1 Telegrafenberg A17, GeoForschungsZentrum Potsdam (GFZ), 14473 Potsdam, Germany;4. Bundesamt für Kartographie und Geodäsie (BKG), Richard-Strauss-Allee 11, 60598 Frankfurt Main, Germany;1. Institut Für Erdmessung, Schneiderberg 50, Leibniz University of Hannover, Germany;2. Max-Planck Institute of Gravitational Physics, Leibniz University of Hannover, Germany;3. Institute of Theoretical and Satellite Geodesy, TU Graz, Austria;1. School of Land Science and Technology, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;2. German Research Centre for Geosciences (GFZ), Telegrafenberg, Potsdam 14473, Germany;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Mechanical Engineering, Changzhou University, Changzhou 213016, China;1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, State Key Laboratory of Geodesy and Earth’s Dynamics, Wuhan 430077, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Liverpool Earth Observatory, University of Liverpool, United Kingdom;2. Department of Surveying Engineering, Guangdong University of Technology, Guangzhou, 510006, China;3. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China |
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| Abstract: | In this study, the loading gravity effect of air mass changes calculated with the three-dimension (3D) meteorological data from the European Centre for Medium-range Weather Forecasts (ECMWF) are removed from superconducting gravimeter (SG) observations. The global hydrological gravity effect is computed and removed with hydrological data from the Global Land Data Assimilation System (GLDAS). Otherwise, the gravity influences induced by a theoretical self-consistent ocean pole tide and variations in length of day (LOD) are considered in the calculation. After removing the influences mentioned previously and also considering the long term trend in the data, a very nice linear relationship between the theoretical gravity pole tide and observed gravity residual (containing the observed gravity pole tide) for each of the selected 9 GGP stations we considered can be obtained. Therefore, the gravimetric factor of the gravity pole tide can be estimated with a simple linear regression. The results show that no clear phase lag is found between the theoretical gravity pole tide and observed gravity residuals from the nine SG stations. |
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