| 极移振幅主要周期分量的时变特征 |
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| 引用本文： | 韩永志,马利华,尹志强.极移振幅主要周期分量的时变特征[J].地球物理学进展,2006,21(3):798-801. |
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| 作者姓名： | 韩永志 马利华 尹志强 |
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| 作者单位： | 1. 中国科学院国家天文台，北京 100012；2. 中国科学技术馆，北京 100029 |
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| 基金项目： | 国家自然科学基金(10373017)资助 |
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| 摘 要： | 用JPL近年发布的地极坐标序列求得1893―1998年间极移的振幅序列，用最大熵谱分析方法求得了该资料序列包含的一些周期的参数，并利用小波变换方法分析讨论了其中的主要周期的变化.结果表明，极移振幅变化中存在着约6.5年和约40年的主要周期，且它们均具有一定程度的时变性.因此，在研究讨论极移与一些地球物理现象和自然灾害现象的关系时，应特别注意极移振幅中主要周期的时变特征.
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| 关 键 词： | 地极移动 谱分析 振幅 小波变换 时变 |
| 文章编号： | 1004-2903（2006）03-0798-04 |
| 收稿时间： | 2005-10-12 |
| 修稿时间： | 2005-12-20 |
Time-variation of periodic components of polar motion amplitude |
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| HAN Yong-zhi,MA Li-hua,YIN Zhi-qiang.Time-variation of periodic components of polar motion amplitude[J].Progress in Geophysics,2006,21(3):798-801. |
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| Authors: | HAN Yong-zhi MA Li-hua YIN Zhi-qiang |
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| Institution: | 1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012,China 2. China Science and Technology Museum, Beijing 100029, China |
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| Abstract: | The data series of the polar motion amplitude in 1893.0—1997.95 was obtained from coordinates of the Earth’s pole that are published by JPL in recent years. The parameters of the variational periods of the data series were got by the Maximum Entropy Power Spectrum Analysis. The authors analyzed and discussed the change of the periods using wavelet transform. The result shows that there are main periods in the amplitude variation, such as about 6.5-year and 40-year, and the periods have the character of variation with time. Thus, the time-variation of main periods of the polar motion amplitude should be paid more attention when the relationship between polar motion and some geophysical phenomena and natural disasteris is studied. |
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| Keywords: | polar motion spectrum analysis amplitude wavelet transform time-variation |
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