热带地理2011，Vol.31Issue(1)：21-27,7.
我国西南地区2009年秋季特大旱灾大气环流特特征分析
The Atmospheric Circulation Features of the Heavy Drought in Southwest China in Autumn 2009
摘要
Abstract
Monthly precipitation data of the 129 stations in Southwest China and the NCEP/NCAR data from 1961 to 2009 are used to analyze the rainfall anomaly and the atmospheric circulation features in autumn 2009. The results show that (l)both the warm moisture flux from the Bay of Bengal and the South China Sea and the cold moisture flux from Inner Mongolia decreased in autumn 2009, that made the interaction between cold and warm moisture flux weaken. (2)Moisture convergence reduced in Southwest China in September, and increased in November, when the moisture flux from the Bay of Bengal and the South China Sea decreased, that made rainfall decrease. (3)Zonal westerly circulation enhanced in September and October. In November, meridional westerly circulation became stronger, but the 700-500hpa meridional wind vector over the western Inner Mongolia, Ningxia, Sichuan weakened. (4)The West Pacific Subtropical High became stronger and moved west in September, and Southwest China was under its control, that made water vapor convergence reduced. In October, the West Pacific Subtropical High was over Yunnan, Guizhou and Guangxi. In November, the High stretched toward the Bay of Bengal, southerly wind only existed to the north of 17.5N, that made moisture flux from the Bay of Bengal weaken. Based on the above analysis, the authors think that water vapor flux anomaly, westerly circulation anomaly and the West Pacific Subtropical High being stronger and moving west are important factors affecting the autumn rainfall of 2009 in Southwest China.关键词
西南地区/秋旱/大气环流Key words
Southwest China/ autumn drought/ Atmospheric circulation分类
天文与地球科学引用本文复制引用
张新主,章新平,关华德,谢自楚..我国西南地区2009年秋季特大旱灾大气环流特特征分析[J].热带地理,2011,31(1):21-27,7.基金项目
国家自然科学基金资助项目(40871094 （）
40871043) （）
高等学校博士学科点专项科研基金(20094306110006) （20094306110006）
湖南省重点学科建设项 目(40652001) （40652001）
