热带地理2011，Vol.31Issue(1)：28-33,6.
云南省2009/2010年秋冬季罕见干旱诊断分析
Diagnosis of the Severe Drought in Autumn/Winter 2009-2010 in Yunnan Province
摘要
Abstract
Severe drought disaster occurred in a large area of Yunnan during autumn and winter 2009-2010, that is the heaviest one in the province since meteorological record was established. The formation of the drought is analyzed in this paper. It is found that the drought event was directly related with the abnormal atmospheric circulation systems. The main causes that lead to the event were that the polar vortex at 500hPa slanted towards the west hemisphere and its intensity wass weaker than average. The western Pacific subtropical high at 500hPa located at a more western position and was stronger than normal. The water vapor brought to Yunnan was inhibited as the Bay of Bengal was controlled by northeast flow at 700hPa flow field. The dry flow was dominant over Yunnan and no cold air was brought to the province during autumn and winter 2009-2010. OLR was higher in the Bay of Bengal and Yunnan. Convective activities were inhibited and very few rainfall cloud systems could be formed.关键词
云南/严重干旱/大气环流异常Key words
Yunnan/ drought/ atmospheric circulation anomalies分类
天文与地球科学引用本文复制引用
黄慧君,李庆红,高月忠,钟爱华,陈红玉,李建美..云南省2009/2010年秋冬季罕见干旱诊断分析[J].热带地理,2011,31(1):28-33,6.基金项目
云南省气象局业务能力研究与提升建设专项项目(YM200902) （YM200902）
