On the comparison of tidal gravity parameters with tidal models in central Europe |
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| Institution: | 1. Catholic University of Louvain, Georges Lemaître Centre for Earth and Climate Research, Belgium;2. Research Institute of Geodesy, Topography and Cartography, Geodetic Observatory Pecný, Czech Republic;3. Department of Meteorology and Geophysics, University of Vienna, Austria;4. State Key Laboratory of Geodesy and Earth''s Dynamics, Institute of Geodesy and Geophysics, CAS, Wuhan, China;1. Instituto de Física de Rosario (IFIR-CONICET), Rosario, Argentina;2. Instituto de Física de Rosario (IFIR-CONICET) and Instituto de Astronomía y Física del Espacio, Casilla de Correos 67, Sucursal 28, 1428 Buenos Aires, Argentina;1. State Key Laboratory of Geodesy and Earth''s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;2. Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;2. INRS Énergie Matériaux Télécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2;1. Institute of Applied Problems of Physics, NAS of Armenia, 25 Nersessyan Str., 0014 Yerevan, Armenia;2. Institute of Mineralogy and Crystallography, University of Vienna, Althanstr. 14, A-1090 Vienna, Austria |
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| Abstract: | Two accurately calibrated superconducting gravimeters (SGs) provide high quality tidal gravity records in three central European stations: C025 in Vienna and at Conrad observatory (A) and OSG050 in Pecný (CZ). To correct the tidal gravity factors from ocean loading effects we compared the load vectors from different ocean tides models (OTMs) computed with different software: OLFG/OLMP by the Free Ocean Tides Loading Provider (FLP), ICET and NLOADF. Even with the recent OTMs the mass conservation is critical but the methods used to correct the mass imbalance agree within 0.1 nm/s2. Although the different software agrees, FLP probably provides more accurate computations as this software has been optimised. For our final computation we used the mean load vector computed by FLP for 8 OTMs (CSR4, NAO99, GOT00, TPX07, FES04, DTU10, EOT11a and HAMTIDE). The corrected tidal factors of the 3 stations agree better than 0.04% in amplitude and 0.02° in phase. Considering the weighted mean of the three stations we get for O1 δc = 1.1535 ± 0.0001, for K1 δc = 1.1352 ± 0.0003 and for M2 δc = 1.1621 ± 0.0003. These values confirm previous ones obtained with 16 European stations. The theoretical body tides model DDW99/NH provides the best agreement for M2 (1.1620) and MATH01/NH for O1 (1.1540) and K1 (1.1350). The largest discrepancy is for O1 (0.05%). The corrected phase αc does not differ significantly from zero except for K1 and S2. The calibrations of the two SG's are consistent within 0.025% and agree with Strasbourg results within 0.05%. |
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| Keywords: | Superconducting Gravimeter (SG) Ocean Tides Loading Computations Body Tides Models |
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