Tropical Geography ›› 2020, Vol. 40 ›› Issue (2): 357-366.doi: 10.13284/j.cnki.rddl.003236

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Spatio-Temporal Variation of Drought in Guangdong Province from 1960 to 2014

Wang Shuihan1,2,3, Qiu Jianxiu1,2,3(), Wang Dagang1,2,3   

  1. 1.Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275,China
    2.Key Laboratory of Mineral Resource & Geological Processes of Guangdong Province, Guangzhou 510275, China
    3.Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, China
  • Received:2019-07-05 Revised:2019-10-16 Online:2020-03-10 Published:2020-05-15
  • Contact: Qiu Jianxiu E-mail:qiujianxiu@mail.sysu.edu.cn

Abstract:

Drought has a serious impact on socio-economic development in China and around the world. This study used daily precipitation records from 24 meteorological stations in Guangdong Province, China from 1960 to 2014 to analyze the spatio-temporal characteristics of drought in that region based on the Equivalent Dry Period (EDP) metric converted from the Average Waiting Time for Precipitation index. Particular emphasis was placed on the spatio-temporal evolution of drought in the 21 stcentury. The results showed that the EDP index was suitable for analyzing drought characteristics in Guangdong Province. Overall, drought intensity decreased from east to west and from south to north, with coastal areas experiencing more severe drought than northern and western areas. During the study period, decadal variations and an annual increasing trend in EDP were obvious over the entire province. In addition, seasonal drought was prominent, occurring most frequently in autumn and winter, followed by spring; the drought’s central location varied from season to season. Drought frequency, intensity, and spatial extent were all higher in the early 21 stcentury than those in the late 20 th century. Specifically, since the turn of the century, both Dongyuan Station in the eastern Pearl River Delta and Luoding Station in western Guangdong showed significant increases in EDP and emerged as new drought hotspots. From a seasonal perspective, autumn and winter drought intensified most severely and tended to extend throughout Guangdong Province, with an EDP increase of 23% from the late 20th century to the early 21 st century. Spring drought worsened more gradually and summer drought occurred more frequently (though still rarely) in the early 21 stcentury. These results identified the spatial pattern and temporal evolution of drought in Guangdong Province since the turn of the century and provide scientific references and technical support for drought monitoring and mitigation in southeastern China.

Key words: drought evolution, AWTP index, EDP index, 21 stCentury, Guangdong

CLC Number: 

  • K903