J4 ›› 2011, Vol. 29 ›› Issue (3): 283-288.

• 论文 • 上一篇    下一篇

中国南方地区近50 a 夏季干旱时空分布特征

茅海祥王文   

  1.  南京信息工程大学,气象灾害省部共建教育部重点实验室,江苏南京210044
  • 收稿日期:2011-02-23 修回日期:2011-05-05 出版日期:2011-11-30 发布日期:2011-09-30
  • 作者简介:茅海祥( 1980 - ) ,男,江苏盐城人,硕士研究生,主要从事气候变化研究. E - mail: hxmaohb@126. com
  • 基金资助:

    行业专项“多时间尺度干旱监测与预警、评估技术研究”( GYHY201006023) 资助

Temporal and Spatial Distribution Characteristic of Summer Drought in South China over Recent 50 Years

MAO Haixiang,WANG Wen   

  1.  Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science & Technology,Nanjing 210044,China
  • Received:2011-02-23 Revised:2011-05-05 Online:2011-11-30 Published:2011-09-30

摘要:

基于1960 ~ 2009 年50 a 的降水资料,进行了Z 指数变换,再利用降水距平场作REOF 分区,并分别对各区域代表站点Z 指数序列作线性趋势分析、MK 分析和Morlet 小波分析。结果表明: 我国南方5 个分区的年际及年代际波动幅度都比较明显,但都呈由干变湿的趋势。且5 个典型代表站点分别在1973 年, 1993 年, 1992 年, 2002 年和1979 年发生突变,突变后UF 一直呈上升趋势,总体都由干变湿,5个分区旱涝异常具有相对一致的性质。中国南方地区夏季降水具有多时间尺度振荡的特点,存在2 ~ 3 a,5 ~ 6 a 的期。

关键词: 中国南方, 夏季降水, Z 指数, REOF

Abstract:

 Based on summer rainfall data over 213 stations in South China from 1960 to 2009,Z index,REOF,LR,M - K and Morlet wavelet analysis methods are used to investigate variations of summer rainfall in South China. Results show that the precipitation area in summer is mainly divided into five regions by using REOF analysis and the representative stations are Yueyang,Guangzhou,Lishui,Xinyang and Chaohu,respectively. The interannual and decadal fluctuating of precipitation in five typical stations was obvious,and annual mean precipitation increased,especially in Chaohu and Xinyang station. M - K test shows that the precipitation mutation in five regions was found in 1973,1994,1992,2002,1979,respectively. After the precipitation mutation,the Z - index was increasing and presented the tendency from dry to wet in these five regions. The summer precipitation in South China had period of 2 - 3 years and 5- 6 years.

Key words:  South China, summer precipitation, Z - index, REOF

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