PROGRESS IN GEOGRAPHY ›› 2019, Vol. 38 ›› Issue (11): 1793-1801.doi: 10.18306/dlkxjz.2019.11.014

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Characteristics and influencing factors of surface solar radiation variation in Kunming City

HE Ping1, CUI Meiyan1, LI Jinxiao2, LIU Shuhua3,*()   

  1. 1. The college of Geography and Tourism Management, Chuxiong Normal University, Chuxiong 675000, Yunnan, China
    2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, CAS, Beijing 100029, China
    3. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China;
  • Received:2018-10-29 Revised:2019-02-15 Online:2019-11-28 Published:2019-11-28
  • Contact: LIU Shuhua
  • Supported by:
    National Natural Science Foundation of China, No(41465001)


Based on the 24 years (1993-2016) meteorological data including solar radiation and other related variables, this study analyzed the characteristics of surface solar radiation variation in Kunming City, and examined its influencing factors by using the methods of regression analysis, Mann-Kendall (M-K) abrupt test, wavelet analysis, and grey correlation degree analysis. The results show that surface solar radiation varied between 4620.21 MJ/m 2 and 6221.65 MJ/m 2, the maximum occurred in 2016 and the minimum occurred in 2008, and the annual mean was 5598.06 MJ/m 2. Annual mean solar radiation showed a fluctuating rising trend. The dry and wet seasons are distinct in Kunming City, and the maximum surface solar radiation appeared in dry season (November to April of the following year at 2825.22 MJ/m 2), but the minimum appeared in rainy season (May to October, at 2774.41 MJ/m 2). Maximum monthly variation of surface solar radiation in Kunming City appeared in April (604.75 MJ/m 2), and the minimum appeared in December (361.01 MJ/m 2). The difference of surface solar radiation between April and December was 243.74 MJ/m 2. According to the M-K abrupt test, the point of abrupt change appeared in 2014, but it is statistically insignificant. On the one hand, annual wavelet analysis detected a 15-year primary period of surface solar radiation. On the other hand, using seasonal wavelet analysis of surface solar radiation, the amplitude of surface solar radiation in dry season was stronger than in rainy season, but the primary periods are both 19 days. Finally, through grey relational analysis, the 24-year surface solar radiation was influenced by both human and natural factors. Precipitation is an important natural factor, but gross industrial output value is an important human factor influencing the surface solar radiation variation in Kunming City. Compared to the human factor, natural factor is the main contributor of the surface solar radiation variation in Kunming City.

Key words: solar radiation, variation characteristics, influencing factors, Kunming City