| CEOF ANALYSIS OF ATMOSPHERIC LOW FREQUENCY OSCILLATION IN LOWER LATITUDE REGION AND FREQUENCY MODULATION PHENOMENA OF LOW FREQUENCY SIGNALS |
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| 作者姓名： | Luo Jian Yu Shihua |
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| 作者单位： | The Air Force Meteorology Institute Nanjing 211101，The Air Force Meteorology Institute，Nanjing 211101 |
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| 摘 要： | The low frequency oscillation of the low level atmospheric circulation in lower latitudes region is studied by usingthe CEOF method and other normal spectral analysis methods.It is found that in the atmospheric motion frequencyspectrum,there exist certain frequency bands with relatively-concentrated energy among low frequency bands,andthere is nonlinear interaction of frequency modulation among peak signals.It is this modulating action that leads to thechange of the temporal-spatial features of frequency and phase of these low frequency signals.In the paper,the propa-gation picture of low frequency waves modulated and its influence on midium-range variation of summer monsoon arealso discussed.
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| 收稿时间： | 3/9/1993 12:00:00 AM |
| 修稿时间： | 1994/6/15 0:00:00 |
CEOF ANALYSIS OF ATMOSPHERIC LOW FREQUENCY OSCILLATION IN LOWER LATITUDE REGION AND FREQUENCY MODULATION PHENOMENA OF LOW FREQUENCY SIGNALS |
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| Luo Jian,Yu Shihua.CEOF ANALYSIS OF ATMOSPHERIC LOW FREQUENCY OSCILLATION IN LOWER LATITUDE REGION AND FREQUENCY MODULATION PHENOMENA OF LOW FREQUENCY SIGNALS[J].Acta Meteorologica Sinica,1995,9(2):199-206. |
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| Authors: | Luo Jian and Yu Shihua |
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| Institution: | Luo Jian Yu Shihua The Air Force Meteorology Institute,Nanjing 211101 |
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| Abstract: | The low frequency oscillation of the low level atmospheric circulation in lower latitudes region is studied by using the CEOF method and other normal spectral analysis methods.It is found that in the atmospheric motion frequency spectrum,there exist certain frequency bands with relatively-concentrated energy among low frequency bands,and there is nonlinear interaction of frequency modulation among peak signals.It is this modulating action that leads to the change of the temporal-spatial features of frequency and phase of these low frequency signals.In the paper,the propa- gation picture of low frequency waves modulated and its influence on midium-range variation of summer monsoon are also discussed. |
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| Keywords: | CEOF analysis low frequency oscillation(LFO) frequency modulation |
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