| 摘要: |
| 采用两个不同的东亚夏季风指数分析了1951～1999年间东亚夏季风强度的年代际变化特征。结果一致表明,20世纪70年代中期左右,东亚夏季风经历了由强到弱的年代际变化。而且西太平洋副热带高压作为东亚季风系统的重要成员,其强度和位置也在1970年代中期左右发生了明显的年代际变化。这种大气环流背景的年代际变化造成了1970年代中期以后我国的华北地区干旱少雨;长江中下游地区洪涝多雨。 |
| 关键词: 东亚夏季风 年代际变化 中国降水 |
| DOI： |
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| 基金项目:国家重点基础研究发展规划项目“我国重大气候灾害的形成机理和预测理论研究”(G1998040903)资助 |
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| THE INTERDECADAL VARIABILITY OF EAST ASIA MONSOON AND ITS EFFECT ON THE RAINFALL OVER CHINA |
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LU Jun-mei,REN Ju-zhang,JU Jian-hua
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Department of atmospheric science, Yunnan University, Kunming 650091, China
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| Abstract: |
| The interdecadal variability of the East Asia summer monsoon during 1951～1999 is analyzed by using two different East Asia monsoon indices. The results agrees on the point that the East Asia monsoon has undergone an interdecadal variability in the mid-1970s.The intensity of the East Asia monsoon is weaker after this transition. Moreover the intensity and location of subtropical high that is an important component in East Asia monsoon system also shows interdecadal variation obviously. It is the interdecadal variation in atmospheric circulation that causes the drought over North China and flooding along the middle and lower reaches of the Yangtze River after the mid-1970's. |
| Key words: East Asia summer monsoon interdecadal variability rainfall over China |
