Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (3): 312-320.doi: 10.11821/xb201203003

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Spatio-temporal Probability Behaviors of the Maximum Consecutive Wet Days in Xinjiang, China

LI Jianfeng1,2,3, ZHANG Qiang1,2,3, BAI Yungang4, ZHANG Jianghui4   

  1. 1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, China;
    2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou 510275, China;
    3. School of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou 510275, China;
    4. Xinjiang Research Institute of Water Resources and Hydropower, Urumqi 830049, China
  • Received:2011-09-08 Revised:2012-11-08 Online:2012-03-20 Published:2012-05-14
  • Supported by:
    Xinjiang Technology Program, No.201001066; 200931105; National Natural Science Foundation of China, No.41071020; No.50839005)

Abstract: Based on the daily precipitation data from 51 rain stations in Xinjiang during 1960-2005, the spatial and temporal possibility variations of maximum consecutive wet days in the whole year, summer and winter seasons are studied. Nine precipitation extreme indices which reflect the attributes of consecutive maximum wet days are defined, modified Mann-Kendall test is applied to detect the tendencies, and changing rates of indices are evaluated through linear regression with F test. Results show that: (1) two days consecutive wet days occurred most frequently during the year and summer, and the precipitation intensities decreased as the number of days of maximum consecutive wet days increased; in winter, one day consecutive wet days had the maximum possibility, and the intensities increased as the number of days of the maximum consecutive wet days increased; (2) the possibilities of consecutive wet days with short durations reduced, while those of the large number of days increased; the precipitation of consecutive wet days had increasing trends; the intensities of all numbers of days increased; (3) a wet tendency was identified in Xinjiang; wet trend in Southern Xinjiang was more significant than in Northern Xinjiang in summer, while in winter the wet tendency in Northern Xinjiang was more remarkable.

Key words: maximum consecutive wet days, precipitation extreme, Mann-Kendall test, climate change, Xinjiang