| 甘肃省河东地区伏旱的小波分析 |
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| 引用本文： | 张存杰,董安祥,白虎志,张焕儒.甘肃省河东地区伏旱的小波分析[J].应用气象学报,1998,9(3):291-297. |
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| 作者姓名： | 张存杰 董安祥 白虎志 张焕儒 |
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| 作者单位： | 1.甘肃省气候资料中心 |
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| 基金项目： | 国家科委重中之重96－908－05－03课题 |
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| 摘 要： | 该文阐述了小波变换的基本思路和优点，并对甘肃省河东地区1951～1995年伏期干旱强度指数分别用墨西哥帽型小波和Haar型小波进行了分析。结果表明:甘肃省河东地区的伏旱由不同尺度的振荡构成，中部地区的伏旱准19年的振荡周期较明显，有2个上升和2个下降阶段；陇东和陇南地区准22年和准10年的振荡周期较明显，有1个上升和2个下降阶段。对原时间序列进行了不同尺度的重构，说明小波分析可以用于滤波。
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| 关 键 词： | 伏旱强度指数 小波分析 振荡周期 |
Wavelet Analysis of Summer Drought in East of the Yellow River in Gansu Province |
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| Institution: | (Climate Data Center of Gansu Province, Lanzhou 730020) |
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| Abstract: | The basic idea and the advantage of wavelet analysis are described, and the index of the summer drought intensity in east of the Yellow River in Gansu Province from 1951 to 1995 are calculated using Mexican cap wavelet and Haar wavelet analysis methods, respectively. The results show that the summer drought events in east of the Yellow River in Gansu Province is composed of oscillations on different time scales. In the middle of Guansu Provine, there is an obvious oscillation period of quasi-19 years, with two ascending and two descending episodes. In east and south Guansu, there are obvious oscillation periods of quasi-22 and quas-10 years, respectively, with one ascending and two descending episodes. Reconstruction of original time series of summer drought intensity index in terms of different time scales indicates that the wavelet analysis method could be used in filtering. |
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| Keywords: | Index of summer drought intensity Wavelet analysis Oscillation periods |
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