| 广西近50年暴雨日数变化的小波分析 |
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| 引用本文： | 廖雪萍,覃卫坚,唐炳莉,丘平珠.广西近50年暴雨日数变化的小波分析[J].气象,2007,33(12):39-45. |
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| 作者姓名： | 廖雪萍 覃卫坚 唐炳莉 丘平珠 |
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| 作者单位： | 1. 广西区气候中心,南宁,530022
2. 广西区气象信息中心 |
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| 摘 要： | 利用1951—2005年广西降水资料,使用Morlet小波分析方法分析了暴雨和大暴雨日数的年际变化,结果表明均具有明显的周期变化规律特征,都存在着2、4、8、14年周期振荡信号,其中2年周期振荡信号最强,其次为4,8,14年,各周期信号分布的时间区域略有差异。广西暴雨日数变化总趋势为逐渐增多,在1990年代进入高峰期。影响广西暴雨发生的主要天气系统为热带气旋、西南低涡、低空急流、高空槽,其中热带气旋、西南低涡是广西特大暴雨发生的主要原因。
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| 关 键 词： | Morlet小波分析 暴雨 影响系统 |
| 收稿时间： | 2007-05-14 |
| 修稿时间： | 2007-09-30 |
Wavelet Analysis of Variation of Rainstorm Days in Guangxi in Recent 50 Years |
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| Liao Xueping,Qin Weijian,Tang Bingli and Qiu Pingzhu.Wavelet Analysis of Variation of Rainstorm Days in Guangxi in Recent 50 Years[J].Meteorological Monthly,2007,33(12):39-45. |
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| Authors: | Liao Xueping Qin Weijian Tang Bingli and Qiu Pingzhu |
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| Institution: | Guangxi Climate Center, Nanning 530022;;Guangxi Climate Center, Nanning 530022;;Guangxi Meterological Informational Center;Guangxi Meterological Informational Center |
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| Abstract: | Based on the analysis of inter-annual variation of rainstorm and heavy rainstorm days in Guangxi from 1951 to 2005 with the Morlet wavelet method,it shows that both exist significant periodic oscillations,with strong 2-,4-,8-,14-year periods and 2-year period as the strongest.Moreover,the distributions of the frequencies and intensities are so different that the short-period oscillations are stronger than the longer ones.The rainstorm days in Guangxi exhibit an increasing tendency on a long-term basis.There are four main synoptic systems that influence the occurrence of Guangxi rainstorm:tropical cyclone,southwest vortex,low-level jet and upper-troposphere trough,and the main influencing system contributing to the excessive rainstorm in Guangxi is tropical cyclone and southwest vortex. |
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| Keywords: | Morlet wavelet method rainstorm influencing system |
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