| 摘要: |
| 首先利用旱涝Z指数对全国9大气候区的旱涝进行了评定,并给出我国9大气候区旱涝Z指数的分布图。分析结果表明,1950年代我国除新疆地区处于偏旱期外,其它几个区都处于多雨量期,1960年代由多雨向少雨转变的时期,1970年代～1980年代中期我国大部分地区处于雨量偏少期;1990年之后我国各个区的雨量都有所增加。此外,还应用Morlet小波变化对我国9大气候区降水的旱涝周期变化、旱涝分型及变化趋势进行了分析。研究结果表明:在16年、32年层次变化上,各气候区在不同时间段上,8年层次上降水的变化出现了一定的规律:东北、华北在1980年之后存在1年位相差;而长江中下游、江南及华南三者之间在1951~1970年时段上依次有着2年的位相差;长江中下游、内蒙及新疆之间依次存在着3年位相差。 |
| 关键词: Z指数 气候区 旱涝 小波 多尺度 分析 |
| DOI： |
| 分类号: |
| 基金项目:国家"十·五" "211"重点学科"不同时空尺度的环境演变和生态建设"项目资助 |
|
| STUDY ON THE CHARACTERISTICS OF THE PRECIPITATION OF NINE REGIONS IN CHINA AND THEIR PHYSICAL CAUSES —— The Analysis of Basic Character |
|
MIAO Juan1, LIN Zhen-shan2
|
|
1.The Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, China;2.The Department of Geography, Nanjing Normal University, Nanjing 210097, China
|
| Abstract: |
| First,the Z-index is selected to indicate the degree of drought or floods in this paper. By Z-index a summary of drought or floods of nine regions in China is given. Then,Morlet wavelet is selected to analyze the periods and trend of drought or floods,and on the base of Morlet wavelet. The result shows that during different periods,the variation of precipitation at the 8-year level shows some rules: there is one year phase difference in Northeast China and North China after 1980;and in the region of Changjiang middle and lower reaches,South of Changjiang River and Southern China,there is 2-year phase difference from 1951 to 1970;and in Changjiang middle and lower reaches,Inner Mongolia Region and Xinjiang,there is 3-year phase difference. |
| Key words: Z-index climatic regions drought or floods wavelets transformation multi-scale analysis |
