| 日长年际变化,ElNino／南方涛动和大气准两年振荡的小波分析 |
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| 引用本文： | 周永宏,郑大伟.日长年际变化,ElNino／南方涛动和大气准两年振荡的小波分析[J].天文学报,1997,38(2):209-214. |
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| 作者姓名： | 周永宏 郑大伟 |
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| 作者单位： | 中国科学院上海天文台!上海，20003 |
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| 基金项目： | 国家八五重大关键基础研究项目，国家自然科学基金 |
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| 摘 要： | 本文采用1964-1993年期间日长变化序列、海平面气压和纬向风速资料，通过小波变换等技术研究分析日长年际变化与ElNino／南方涛动、大气准两年振荡之间的关系．结果表明，日长年际变化与ElNino／南方涛动存在着相似的谱结构，而且ElNino／南方涛动叠加上大气准两年振荡后，与日长变化序列的小波变换时频谱更趋于一致．本文研究结果证实，ElNino／南方涛动和大气准两年振荡的贡献基本能够解释地球自转的年际变化．
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| 关 键 词： | 日长变化 气象涛动 小波变换 |
WAVELET ANALYSIS OF INTERANNUAL LENGTH-OF-DAY VARIATION, EL NINO-SOUTHERN OSCILLATION AND ATMOSPHERIC QUASI-BIENNIAL OSCILLATION |
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| Zhou Yong-hong, Zheng Da-wei.WAVELET ANALYSIS OF INTERANNUAL LENGTH-OF-DAY VARIATION, EL NINO-SOUTHERN OSCILLATION AND ATMOSPHERIC QUASI-BIENNIAL OSCILLATION[J].Acta Astronomica Sinica,1997,38(2):209-214. |
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| Authors: | Zhou Yong-hong Zheng Da-wei |
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| Abstract: | The length-of-day (LOD) variahon series, an level pressure, and zonal wind sperd data are employed in this paper to make the wavelet analysis of the relationship among interannual LOD variation, El Nino-Southern Oscillation (ENSO) and atmospheric Quasi-Biennial Oscillation(QBO). The results suggest that the inthernnual LOD variation has a spectral stricture similar to that of ENSO. Moreover, the wavelet time-frequency spectrum of ENSO added by atmospheric QBO agrees well with that of interannual LOD variation. The research results of the present paper demonstrate that the contributions of ENSO and atmospheric QBO can generally account for the interannual variation in theEarth' s rotation. |
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| Keywords: | variation in the length-of-day meteorological oscillation wavelet transform |
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