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《Chinese Journal of Geophysics》 2017-12
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The latest gravity tide results in Beijing and its application in detecting resonant effect of the fluid outer core

SUN He-Ping;LIU Qing-Chao;WU Shu-Qing;CHEN Xiao-Dong;FENG Jin-Yang;ZHANG Miao-Miao;XU Jian-Qiao;LI Chun-Jian;State Key Laboratory of Geodesy and Earth′s Dynamics,Institute of Geodesy and Geophysics,Chinese Earthquake Administration;University of Chinese Academy of Sciences;National Institute of Metrology;  
Using the latest observations recorded with superconducting gravimeter iGrav-012 at Changping lab of National Institute of Metrology,China,the gravimetric parameters are determined accurately based on harmonic analysis after carefully preprocessing of the raw data.Meanwhile,the loading effects of ocean tides on the gravity are calculated by means of loading theory and integral convolution technology with 14 global ocean tide models,which included HAM11 a,DTU10 and EOT11 a.Then,the intrinsic parameters of the free core nutation(FCN)are retrieved based on the resonance effect of the tidal amplitude factors in the diurnal band.Theresults show that the accuracy of tidal gravity observations is very high,with the standard deviation of 1.184 nm·s-2.Based on the FFT with Hanning window,the Seismic Noise Magnitude(SNM)in seismic band is obtained with the value of 0.206,which indicates that Changping lab is a low ambient noise station.With 14 ocean tide models,the mean loading correction effectiveness of wave O1 and K1 are 83% and 82%,respectively.On the basis of stacking method using 13 high-precision models,the FCN′s eigenperiod is solved as 430.0(427.8,432.3)sidereal days,while the quality is a negative one as of-5137.
【Fund】: 国家重点基础研究(973)计划项目(2014CB845092);; 国家自然科学基金(41621091 41674083 41374084 41574072)联合资助
【CateGory Index】: P312.4
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Chinese Journal Full-text Database 5 Hits
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