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Journal of Geographical Sciences  2013, Vol. 23 Issue (1): 3-16    DOI: 10.1007/s11442-013-0989-7
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Extreme drought changes in Southwest China from 1960 to 2009
ZHANG Mingjun, HE Jinyun, WANG Baolong, WANG Shengjie, LI Shanshan, LIU Wenli, MA Xuening
College of Geography and Environment Sciences, Northwest Normal University, Lanzhou 730070, China
Extreme drought changes in Southwest China from 1960 to 2009
ZHANG Mingjun, HE Jinyun, WANG Baolong, WANG Shengjie, LI Shanshan, LIU Wenli, MA Xuening
College of Geography and Environment Sciences, Northwest Normal University, Lanzhou 730070, China
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摘要 

Based on the daily data of temperature and precipitation of 108 meteorological stations in Southwest China from 1960 to 2009, we calculate the monthly and yearly surface humid indexes, as well as the extreme drought frequency. According to the data, the temporal and spatial characteristics of the extreme drought frequency in inter-annual, inter-decadal, summer monsoon period and winter monsoon period are analyzed. The results are indicated as follows. (1) In general, the southwestern Sichuan Basin, southern Hengduan Mountains, southern coast of Guangxi and northern Guizhou are the areas where the extreme drought frequency has significantly increased in the past 50 years. As for the decadal change, from the 1960s to the 1980s the extreme drought frequency has presented a decreasing trend, while the 1990s is the wettest decade and the whole area is turning wet. In the 2000s, the extreme drought frequency rises quickly, but the regional differences reduce. (2) During summer monsoon period, the extreme drought frequency is growing, which generally occurs in the high mountains around the Sichuan Basin, most parts of Guangxi and “the broom-shaped mountains” in Yunnan. It is distinct that the altitude has impacts on the extreme drought frequency; during winter monsoon period, the area is relatively wet and the extreme drought frequency is decreasing. (3) During summer monsoon period, the abrupt change is observed in 2003, whereas the abrupt change during winter monsoon period is in 1989. The annual extreme drought frequency variation is a superposition of abrupt changes during summer monsoon and winter monsoon periods. The departure sequence vibration of annual extreme drought frequency is quasi-5 years and quasi-12 years.

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关键词 Southwest Chinaextreme droughtsummer monsoonwinter monsoon    
Abstract

Based on the daily data of temperature and precipitation of 108 meteorological stations in Southwest China from 1960 to 2009, we calculate the monthly and yearly surface humid indexes, as well as the extreme drought frequency. According to the data, the temporal and spatial characteristics of the extreme drought frequency in inter-annual, inter-decadal, summer monsoon period and winter monsoon period are analyzed. The results are indicated as follows. (1) In general, the southwestern Sichuan Basin, southern Hengduan Mountains, southern coast of Guangxi and northern Guizhou are the areas where the extreme drought frequency has significantly increased in the past 50 years. As for the decadal change, from the 1960s to the 1980s the extreme drought frequency has presented a decreasing trend, while the 1990s is the wettest decade and the whole area is turning wet. In the 2000s, the extreme drought frequency rises quickly, but the regional differences reduce. (2) During summer monsoon period, the extreme drought frequency is growing, which generally occurs in the high mountains around the Sichuan Basin, most parts of Guangxi and “the broom-shaped mountains” in Yunnan. It is distinct that the altitude has impacts on the extreme drought frequency; during winter monsoon period, the area is relatively wet and the extreme drought frequency is decreasing. (3) During summer monsoon period, the abrupt change is observed in 2003, whereas the abrupt change during winter monsoon period is in 1989. The annual extreme drought frequency variation is a superposition of abrupt changes during summer monsoon and winter monsoon periods. The departure sequence vibration of annual extreme drought frequency is quasi-5 years and quasi-12 years.

Key wordsSouthwest China    extreme drought    summer monsoon    winter monsoon
收稿日期: 2012-06-19     
基金资助:

National Natural Science Foundation of China, No.41161012; Program for New Century Excellent Talents in University from the Ministry of Education of China, No.NCET-10-0019; Basic Scientific Research Foundation in University of Gansu Province

作者简介: Zhang Mingjun (1975-), Professor, specialized in global climate change and glaciology. E-mail: mjzhang2004@163.com
引用本文:   
ZHANG Mingjun, HE Jinyun, WANG Baolong, WANG Shengjie, LI Shanshan, LIU Wenli, MA Xuening. Extreme drought changes in Southwest China from 1960 to 2009[J]. Journal of Geographical Sciences, 2013, 23(1): 3-16.
ZHANG Mingjun, HE Jinyun, WANG Baolong, WANG Shengjie, LI Shanshan, LIU Wenli, MA Xuening. Extreme drought changes in Southwest China from 1960 to 2009. Journal of Geographical Sciences, 2013, 23(1): 3-16.
链接本文:  
http://www.geogsci.com/CN/10.1007/s11442-013-0989-7      或      http://www.geogsci.com/CN/Y2013/V23/I1/3

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