| 甘肃河东年降水量的周期变化 |
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| 引用本文： | 李栋梁,谢金南,王蕾,白虎志,刘德祥.甘肃河东年降水量的周期变化[J].高原气象,2000,19(3):295-303. |
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| 作者姓名： | 李栋梁 谢金南 王蕾 白虎志 刘德祥 |
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| 作者单位： | 甘肃省气象局,甘肃省兰州市,730020 |
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| 基金项目： | 国家科技攻关项目,96-908-05-03, |
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| 摘 要： | 利用甘肃河东建站最早的９个代表站的年降水量资料,采用谐波分析和小波分析方法,计算了年降水量序列各种时间尺度的周期,以及１０ａ和２０ａ相空间时间序列的２～１０ａ周期试验;陇南无明显周期;陇南无明显周期。相空间序列的周期试验显示,甘肃中部的准３ａ周期主要反映在５０～７０年代,近２０～３０ａ则以８～９ａ周期较为明显;陇东近１０ａ主要表现为准２ａ振荡。进一步的分析表明,甘肃中部年降水量的准３ａ周期振荡目处
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| 关 键 词： | 甘肃河东 年降水量 周期变化 小波分析 相空间 |
| 修稿时间： | 1999-02-03 |
THE PERIODLY VARIATION OF ANNUAL PRECIPITATION IN EAST GANSU |
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| LI Dong-liang,XIE Jin-nan,WANG Lei,BAI Hu-zhi,LIU De-xiang.THE PERIODLY VARIATION OF ANNUAL PRECIPITATION IN EAST GANSU[J].Plateau Meteorology,2000,19(3):295-303. |
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| Authors: | LI Dong-liang XIE Jin-nan WANG Lei BAI Hu-zhi LIU De-xiang |
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| Abstract: | Nine stations annual precipitation data of east Gansu have been used by means of harmonic analysis and wavelet analysis. From 2 to N/2 years period were calculated and from 2 to 10 years period were experimented in phase space of 10 years and 20 years time sequence. It is shown that the significance level of quasi 3 years period of annual precipitation is the best in central Gansu. East Gansu has 9 years period, south Gansu has not signal period. The period experiment of phase space shown, the quasi 3 years period of annual precipitation of central Gansu is mainly in from 1950's to 1970's, the quasi 9 years period is signally in last 20 to 30 years. the quasi 2 years period oscillation of East Gansu is the mainly in last 10 years. Make further analysis for quasi 3 years period of annual precipitation of central Gansu at the lower point now in the past records, but it has 19 years and over 28 years long period. Maybe it can be return to the significance level in 2000's. The 9 years period shows 23 years rhythm clearly now, but maybe it go into a relatively weak in the coming. |
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| Keywords: | The east Gansu Annual precipitation Period change Wavelet analysis Phase space |
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