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《Progressus Inquisitiones DE Mutatione Climatis》 2013-03
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Characteristics of Drought Variations in Southwest China in 1961-2012 Based on SPEI

Xiong Guangjie~(1,2,4),Zhang Bokai~1,Li Chongyin~(2,3),Shang Kezheng~1,Wang Shigong~1 1 Key Laboratory of Semi-Arid Climate Change of the Ministry of Education,School of Atmospheric Sciences,Lanzhou University, Lanzhou 730000,China;2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;3 Institute of Meteorology,People's Liberation Army University of Science and Technology,Nanjing 211101,China;4 Unit 95718 of People's Liberation Army,Kunming 650000, China  
The characteristics of different timescale drought variations from 1961 to 2012 in Southwest China were studied,by using a new drought index(standardized precipitation evapotranspiration index,SPEI) as the division standard of droughts.The level was calculated based on the monthly precipitation and average air temperature data from 86 meteorological stations.The results show that the drought frequency at 12-month timescale presents a significant declining trend in the Yunnan-Guizhou border zone,but an inconsistent and unclear trend in other regions. The drought frequency at 6-month timescale shows a significant increasing trend in the dry period(NovemberApril in the following year) in the whole research area,but a slowly decreasing trend in the rainy period(MayOctober) in most regions,particularly in southern Sichuan.The drought frequency at 3-month timescale does not indicate a significant trend in spring,but shows a significant increasing trend in autumn and winter,especially in 2000-2012.
【Fund】: 国家公益性行业(气象)科研专项(GYHY201006023 GYHY201106034);; “中央高校基本科研业务费专项基金”自由探索项目(lzujbky2012-123)
【CateGory Index】: P468.02
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