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Research on Characteristics of Drought and Climatic Trend in Yunnan Province

Peng Guifeng1,Liu Yu2 and Zhang Yiping3(1.Yunnan Meteorological Observatory,Kunming 650034,China;2.Climate Center of Yunnan Province,Kunming 650034,China;3.Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Kunming 650223,China)  
The drought composite index of single-station,which is based mainly on Thornthwaite water balance drought index,complemented by effective precipitation index(self-defined,reflecting the effectiveness of short-term rainfall and characteristics of abnormal precipitation) is established.Drought area index and intensity index for quantitative description of the drought situation in the whole province is defined.Using variability and variation coefficient as quantitative indicators of long-term climatic characteristics,drought characteristics and trends of Yunnan Province in Jan.-Mar.,Apr.-first ten days of Jun.,Jun.-Aug.,Sep.-Oct.and Nov.-Dec.are analyzed quantitatively based on the data of 1959-2005 in Yunnan province.The results indicate that,in Yunnan,the most severe drought period is Jan.-Mar.,about two-thirds of the land affected by drought annually.The second is Nov.-Dec.,annually half of the land affected by drought.The third is Apr.-first ten days of Jun.,annually 22% of the land affected by drought.In Yunnan,drought is light in Sep.-Oct.,only 5% of the land affected.In Jun.-Aug.,Yunnan is hardly affected by drought,less than 1% of the land affected.In Apr.-first ten days of Jun.and Sep.-Oct.,drought in Yunnan is getting heavier,especially in Sep.-Oct.,whereas,drought is decreasing in Jan.-Mar.The changes of drought trend in Jun.-Aug.and Nov.-Dec.are unobvious.
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