[1] China Meteorological Administration. Specifications for Ground Meteorological Observation[M]. Beijing: Meteorological Press, 2003.
[2] Liang G H, Zhang X P, Xu W L, et al. Variation of sunshine hours and its influencing factors in recent 50 years in Shuozhou of Shanxi[J]. Journal of Arid Meteorology, 2010, 28(4): 418-421.
[3] Yu H Y, Liu S H, Zhao N, et al. Variation characteristics of the sunshine duration and its relationships with temperature, wind speed, and precipitation over recent 59 years in China[J]. Climatic and Environmental Research, 2011, 16(3): 389-398.
[4] Wu P F. Temporal and spatial variation of sunshine duration and related driving forces in Tianshan mountain during 1961-2015[J]. Meteorological Science and Technology, 2019, 47(3): 450-459.
[5] He L W, Xia Q. Spatial and temporal variation characteristics of sunshine hours and influence of meteorological factors in Xianning[J]. Hubei Agricultural Sciences, 2018, 57(8): 31-34.
[6] Zhang J X, Yang H N. Analysis of the characteristics of sunshine hours in Baicheng City from 1987 to 2017[J]. Modern Agricultural Science and Technology, 2019, (2): 154,156.
[7] An B, Xiao W W. The spatial and temporal variation of sunshine duration from 1961 to 2010 in Shanxi Province[J]. Henan Science, 2018, 36(11): 1775-1780.
[8] Li Y Y, Kang G H, Zhang P Y, et al. Spatial-temporal variation characteristics and mutation analysis of sunshine duration in Henan Province during 1951-2014[J]. Journal of Henan University (Natural Science), 2018, 48(1): 33-44.
[9] Hua W, Fan G Z, Chen Q L, et al. Study of interdecadal variation of the annual sunshine duration over Tibetan plateau[J]. Resources and Environment in the YANGTZE Basin, 2009, 18(12): 1149-1155.
[10] He J J, Huang F R. Analysis on variation of sunshine hours in Xilinhaote City[J]. Chinese Journal of Agrometeorology, 2012, 33(3): 333-339.
[11] Wu C Y, Liu Y H, Li H J, et al. Precipitation grid calculation in Mentougou District, Beijing[C]. Agricultural Meteorology Branch of Chinese Society of Agriculture, Proceedings of the 2006 Academic Annual Conference, Kunming, 2006: 190-192.
[12] Shi B R, Fang Z L. Research on rainfall characteristics and disaster response in Beijing during the flood season[J]. Beijing Agriculture, 2014, (27): 166-168.
[13] Liu W D, You H L, Ren G Y, et al. AWS precipitation characteristics based on K-means clustering method in Beijing area[J]. Meteorological Monthly, 2014, 40(7): 844-851.
[14] Zhao N, Liu S H, Du H, et al. The effects of urbanization on sunshine duration and the trend of cloud cover amount variation in Beijing area[J]. Climatic and Environmental Research, 2012, 17(2): 233-243.
[15] Zhang D F, Cao J C, Wang F. Analysis of changes in climate characteristics of different topography in Mentougou district, Beijing[J]. Modern Agricultural Science and Technology, 2018, 46(20): 202-204.
[16] Guo J, Ren G Y. Variation characteristics of sunshine duration in Tianjin in recent 40 years and influential factors[J]. Meteorological Science and Technology, 2006, 34(4): 415-420.
[17] Hu D K, Zhang H L, Wang L L. Solar energy resource assessment of Xining City in nearly 50 years[J]. Science and Technology of Qinghai Agriculture and Forestry, 2014, (1): 25-30.
[18] Fu J X, Cao G C, Li L Q, et al. Temporal and spatial variation characteristics of sunlight hours in the Qilian mountain, China from 1960 to 2014[J]. Mountain Research, 2018, 36(5): 709-721.
[19] Zhang C C, Zhou W X. Atmospheric Aerosol Tutorial[M]. Beijing: Meteorological Press, 1995.
[20] Wang S Y, Zhang X L, Xu X F. Analysis of variation features of visibility and its effect factors in Beijing[J]. Meteorological Science and Technology, 2003, 31(2): 109-114.
[21] Yu F L, Liu D X, Hu Y. Research on the influence of aerosol fine particles on urban visibility[J]. Meteorological Science and Technology, 2002, 30(6): 379-383.
