| 1980~2013年二阶重力场球谐系数变化研究 |
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| 引用本文： | 田代恒,钟敏,沈迎春,杨萌.1980~2013年二阶重力场球谐系数变化研究[J].大地测量与地球动力学,2016,36(4):350-353. |
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| 作者姓名： | 田代恒 钟敏 沈迎春 杨萌 |
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| 作者单位： | 中国科学院测量与地球物理研究所;中国科学院大学;广东省国土资源厅技术中心 |
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| 基金项目： | 国家973计划(2013CB733305)~~ |
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| 摘 要： | 基于重力场系数与极移和日长变化(LOD)之间的相互关系，计算1980~2013年二阶重力场系数变化（ΔC21、ΔS21），并将其与人卫激光测距（SLR）的结果进行比较分析。结果表明，两者的变化趋势一致。SLR解算的ΔC20存在6 a变化的周期信号，但其振幅只是LOD中6 a信号的1/10，表明LOD中的6 a信号不是由大气、海洋、陆地水等地球动力学过程所激发的，现在还无法确定其激发机制。
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| 关 键 词： | 二阶重力场系数 年际项 十年项 小波分析 快速傅里叶变换 |
Second-Degree Spherical Harmonic Gravity Changes from 1980 to 2013 |
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| TIAN Daiheng;ZHONG Min;SHEN Yingchun;YANG Meng.Second-Degree Spherical Harmonic Gravity Changes from 1980 to 2013[J].Journal of Geodesy and Geodynamics,2016,36(4):350-353. |
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| Authors: | TIAN Daiheng;ZHONG Min;SHEN Yingchun;YANG Meng |
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| Institution: | TIAN Daiheng;ZHONG Min;SHEN Yingchun;YANG Meng;Institute of Geodesy and Geophysics,CAS;University of Chinese Academy of Sciences;Land and Resources Technology Center of Guangdong Province; |
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| Abstract: | Based on the function relationship between gravity coefficient and the Earth orientation parameters (EOP), we estimate second-degree spherical harmonic gravity changes ΔC21 and ΔS21 from 1980 to 2013. Comparison of the ΔC21 and ΔS21 provided by SLR, shows that they agree well with each other. Moreover, we find a 6-year periodicity exists in ΔC20 provided by SLR. Otherwise the amplitude is just 1/10, as compared with the 6-year signal of LOD. This indicates that the 6-year periodicity of LOD is not excited by the atmospheric and oceanic hydrologic motion and the Earth’s body, although the exact mechanisms are still not understood. |
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| Keywords: | degree-two spherical harmonics inter-annual variability decadal variability wavelet analysis fast Fourier transform(FFT) |
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