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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (20): 82-90.doi: 10.11924/j.issn.1000-6850.casb2022-0545

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Temporal and Spatial Distribution Characteristics of Total Solar Radiation in the East of Hexi Corridor

LIU Ying1,2(), REN Liwen3, YANG Hua3, LI Xingyu3, LIU Mingchun3()   

  1. 1 Lanzhou Resources and Environment Vocational and Technical University, Lanzhou 730020
    2 Gansu Weather Modification Office, Lanzhou 730020
    3 Wuwei National Climate Observatory of China Meteorological Administration, Wuwei, Gansu 733000
  • Received:2022-06-27 Revised:2022-10-30 Online:2023-07-15 Published:2023-07-10

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Abstract:

Based on historical data of 11 meteorological observation stations in the east of Hexi Corridor and its surrounding areas, the temporal and spatial characteristics of total solar radiation were analyzed by using linear tendency analysis method, Mann-Kendall method, statistical inversion on surface meteorological observation data, and spatial statistical analysis (by using remote sensing image software ENVI 5.2) method. The results showed that the resource of solar energy in eastern Hexi Corridor was rich and stable. The annual total solar radiation ranged from 5414.19 MJ/m2 to 6500.36 MJ/m2 and the average was 5947.5 MJ/m2, and the grade of solar energy resources belonged to relative abundance. The seasonal order of total radiation was summer>spring>autumn>winter. The total radiation generally increased in the east of Hexi Corridor from 1959 to 2020. The total solar radiation decreased from 1959 to 1989 and increased continuously after a mutation in 1989. The change trend of solar radiation in the east of Hexi Corridor coincided with that of the world, which was firstly decreased and then increased. The total solar radiation increased in the upper and lower reaches of the Shiyang River and decreased in the middle reaches; increased in spring and winter and decreased in summer and autumn. There was one peak time in monthly and daily change, and the total solar radiation from April to August accounted for 55% of that in the whole year. The total solar radiation increased from February to May and decreased from August to October. The annual, quarterly and monthly growth rate in the lower reaches of the Shiyang River was the largest compared with that of the middle and upper reaches. The peak of daily radiation appeared in 12:00—13:00. The total solar radiation from 10:00 to 15:00 accounted for 73% of that in the whole day. The space distribution of total solar radiation was related to altitude and latitude, and was higher in the north and lower in the south, higher in flat land and lower in mountain area.

Key words: the east of Hexi Corridor, total solar radiation, climatological calculation, spatial interpolation, temporal and spatial characteristics