Investigation of the time variability of diurnal tides and resonant FCN period |
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| Affiliation: | 1. State Key Laboratory of Geodesy and Earth''s Dynamics, Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China;2. Institut de Physique du Globe de Strasbourg (UMR 7516 CNRS, Université de Strasbourg/EOST), 5 rue René Descartes, 67084 Strasbourg Cedex, France;3. Georges Lemaître Centre for Earth and Climate Research, Catholic University of Louvain, 3 Chemin du Cyclotron, 1348 Louvain-la-Neuve, Belgium;1. University of Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d’Azur, C.S. 34229, 06304 Nice Cedex 4, France;2. Section of Astrophysics Astronomy & Mechanics, Department of Physics, Aristotle University of Thessaloniki, GR 541 24 Thessaloniki, Greece;1. Beijing Satellite Navigation Center, Beijing 100094, China;2. Shanghai Key Laboratory for Space Positioning and Navigation, Shanghai 200030, China;3. State Key Laboratory of Geodesy and Earth’s Dynamics, Wuhan 430077, China;4. Shanghai Astronomical Observatory, Shanghai 200030, China;1. University of Tasmania, Private Bag 37, 7001 Hobart, Australia;2. Technische Universität Wien, Gußhausstraße 27-29, 1040 Vienna, Austria;3. Geoscience Australia, GPO Box 378, Canberra ACT2601, Australia;1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. Institute of Information and Navigation, Air Force Engineering University, Xian 710077, China;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 |
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| Abstract: | The time variability of diurnal tides was investigated by analyzing gravity observations from global superconducting gravimeter (SG) stations with running time intervals. Through least-square and Bayesian approaches, FCN resonance parameters were estimated for each data section after obtaining the tidal parameters of mainly diurnal tidal waves. The correlation of the time variation in diurnal tidal waves and FCN period was discussed. For comparison, a similar method was used to analyze VLBI observations to study the time variability of nutation terms and FCN period. The variation trend of the FCN period totally depends on the Ψ1 wave in tidal gravity and on the retrograde annual term in nutation. We observed a similar variation trend in the FCN periods obtained from different SG stations worldwide and VLBI observations. The relation between diurnal tides and LOD variations is discussed and the possible mechanisms of the decadal variation in FCN periods were discussed. |
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| Keywords: | Temporal variation Superconducting gravimeter Diurnal tides VLBI FCN period |
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