| Experimental earth tidal models in considering nearly diurnal free wobble of the Earth's liquid core |
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| 作者姓名： | SUN Heping XU Jianqiao & B. Ducarme
Key Laboratory of Dynamic Geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Observatoire Royal de Belgique Av. Circulaire B- Brussels Belgium
Correspondence should be addressed to Sun Heping |
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| 作者单位： | Sun Heping,XU Jianqiao(Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China);B.Ducarme(Observatoire Royal de Belgique, Av. Circulaire 3, B-1180, Brussels, Belgium) |
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| 基金项目： | 国家杰出青年科学基金，中国科学院知识创新工程项目，国家自然科学基金 |
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| 摘 要： | Based on the 28 series of the high precision and high minute sampling tidal gravity observations at 20 stations in Global Geodynamics Project (GGP) network, the resonant parameters of the Earth's nearly diurnal free wobble (including the eigenperiods, resonant strengths and quality factots) are precisely determined. The discrepancy of the eigenperiod between observed and theoretical values is studied, the important conclusion that the real dynamic ellipticity of the liquid core is about 5% larger than the one under the static equilibrium assumption is approved by using our gravity technique. The experimental Earth's tidal gravity models with considering the nearly diurnal free wobble of the Earth's liquid core are constructed in this study. The numerical results show that the difference among three experimental models is less than 0.1%, and the largest discrepancy compared to those widely used nowdays given by Dehant (1999) and Mathews (2001) is only about 0.4%. It can provide with the most recent real
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Experimental earth tidal models in considering nearly diurnal free wobble of the Earth's liquid core |
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| SUN Heping,XU Jianqiao & B. Ducarme
Key Laboratory of Dynamic Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan ,China,
Observatoire Royal de Belgique,Av. Circulaire ,B-,Brussels,Belgium
Correspondence should be addressed to Sun Heping.Experimental earth tidal models in considering nearly diurnal free wobble of the Earth''''s liquid core[J].Chinese Science Bulletin,2003,48(9). |
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| Authors: | Sun Heping XU Jianqiao BDucarme |
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| Institution: | e-mail: heping@ asch.whigg.ac.cn |
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| Abstract: | Based on the 28 series of the high precision and high minute sampling tidal gravity observations at 20 stations in Global Geodynamics Project (GGP) network, the resonant parameters of the Earth's nearly diurnal free wobble (including the eigenperiods, resonant strengths and quality factots) are precisely determined. The discrepancy of the eigenperiod between observed and theoretical values is studied, the important conclusion that the real dynamic ellipticity of the liquid core is about 5% larger than the one under the static equilibrium assumption is approved by using our gravity technique. The experimental Earth's tidal gravity models with considering the nearly diurnal free wobble of the Earth's liquid core are constructed in this study. The numerical results show that the difference among three experimental models is less than 0.1%, and the largest discrepancy compared to those widely used nowdays given by Dehant (1999) and Mathews (2001) is only about 0.4%. It can provide with the most recent real experimental tidal gravity models for the global study of the Earth's tides, geodesy and space techniques and so on. |
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| Keywords: | Earth's nearly diurnal free wobble global observations of superconducting gravimeters dynamic ellipticity of liquid core experimental earth tidal models |
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