JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (6): 1003-1016.doi: 10.11849/zrzyxb.2014.06.009

• Resources Evaluation • Previous Articles     Next Articles

Temporal and Spatial Distributions of Drought in Southwest China over the Past 53 years Based on Standardized Precipitation Evapotranspiration Index

WANG Dong, ZHANG Bo, AN Mei-ling, ZHANG Tiao-feng, JI Ding-min, REN Pei-gui   

  1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
  • Received:2013-04-06 Revised:2013-10-20 Published:2014-06-24

Abstract:

Based on Standardized Precipitation Evapotranspiration Index (SPEI), this study statistically analyzed the meteorological data of 128 meteorological stations during 1960-2012 in Southwest China. It analyzed temporal variation characteristics of drought in nearly half a century from the following perspectives: annual variation trends of drought, seasonal variation trends of drought, drought intensity, the frequency of drought events, drought frequency as well as the relationship with ENSO events. The results show that: 1) It tends to be dry in the entire region of Southwest China and other sub-regions in the past 53 years, and the drought occurs most frequently at the turn of the century. The drought intensity also tends to increase, so does the frequency of extreme drought and medium drought. 2) Most parts of the region tend to be dry in all seasons, it is especially typical in autumn. 3) In Southwest China, the drought happens most frequently in spring, which mainly distributes in Hengduan Mountains, the east Sichuan Basin and the central Yunnan-Guizhou Plateau. In summer, drought mainly distributes in the north Hengduan Mountains, Zoige Plateau and the northwest Guangxi hilly area. In autumn, the drought often happens in Yunnan-Guizhou Plateau, Guangxi hilly area and some parts of Sichuan Basin. In winter, the drought mainly happens in the Zoige Plateau and southwestern part of Sichuan Basin. 4) There are different relevances between the seasonal drought index and ENSO index in all the sub-regions. In the aspect of annual variation trend, there is a significantly negative correlation between the ENSO strength and SPEI of the Sichuan Basin and Hengduan Mountains, and other areas are the opposite. Meanwhile, the droughts will occur in the El Niño and La Niña year in Southwest China. But the drought frequency is higher in the year when the the El Niño events occur than the La Niña events do. However, there are regional differences, it is in El Niño years that the drought often happens in the Sichuan Basin and Zoige Plateau, while Yunnan-Guizhou Plateau is opposite and Guangxi hilly area and Hengduan Mountains are inconspicuous.

Key words: Southwest China, drought, Standardized Precipitation Evapotranspiration Index, ENSO events

CLC Number: 

  • P467