| 利用重力和VLBI技术检测地球液态核的动力学效应 |
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| 引用本文： | 孙和平,刘清超,崔小明,徐建桥.利用重力和VLBI技术检测地球液态核的动力学效应[J].武汉大学学报(信息科学版),2018,43(12):2058-2063. |
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| 作者姓名： | 孙和平 刘清超 崔小明 徐建桥 |
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| 作者单位： | 1.中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 湖北 武汉, 430077 |
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| 基金项目： | 国家自然科学基金41621091国家自然科学基金41674083 |
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| 摘 要： | 利用最新的武汉地区高精度重力和全球高精度甚长基线干涉（very long baseline interferometry，VLBI）测量技术观测确定了地球液态地核的自由核章动本征参数（包括本征周期和品质因子等），同时获得了液核顶部的粘滞系数和液核的真实动力学椭率，使用Monte Carlo方法研究了本征周期的不确定度。结果表明，分别利用重力和VLBI确定的地球自由核章动本征周期值为430 sd（sd指恒星日）左右，两者间的差异为1.47 sd，粘滞系数为1 028 Pa·s。讨论了导致两者差异的主要原因，并将结果与国内外同类研究结果作了对比。
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| 关 键 词： | 重力 VLBI 自由核章动参数 核幔边界物性参数 |
| 收稿时间： | 2018-07-16 |
Detection of the Geodynamics of Earth's Liquid Core by Using Gravity and VLBI Techniques |
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| Affiliation: | 1.State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China2.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Based on the latest high-precision gravity data recorded in Wuhan and global high-accuracy VLBI (very long baseline interferometry) observations, we have determined the intrinsic parameters (including eigen-period and quality factor, et al) of FCN(free core nutation) of Earth's liquid core. Moreover, the viscosity at the top of the liquid core and its real dynamic ellipticity are obtained. By using the Monte Carlo method, we have calculated the uncertainty of the FCN's eigen-period. The results show that the FCN's eigen-periods determined by gravity and VLBI are about 430 sd and the difference between them is 1.47 sd, with the viscosity coefficient of 1 028 Pa·s. This paper discusses the main reasons for the above differences, and finally compares our results with similar research results from China and abroad. |
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