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Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (6): 194-199.doi: 10.11924/j.issn.1000-6850.casb14120036

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Sunshine Duration Variation and Its Influencing Factors in Recent 54 Years in Gansu Province

Fan Limei1, Che Kejun1,2   

  1. (1College of Forestry, Gansu Agricultural University, Lanzhou 730070;2Bailongjiang Forestry Administration, Lanzhou 730050)
  • Received:2014-12-04 Revised:2014-12-16 Accepted:2015-01-13 Online:2015-03-20 Published:2015-03-20

Abstract: The variation of annual, seasonal and monthly sunshine duration were analyzed by using climate trends method, based on monthly sunshine duration of 28 meteorological stations in Gansu Province from 1960 to 2013, and the effect of precipitation, wind speed, vapour pressure and relative humidity change on sunshine duration were studied. The results showed that: Gansu annual sunshine duration in recent 54 years had an increasing trend, and the rate was 1.2 h/10 a. The maximum and minimum sunshine duration presented in May and February respectively. In spring and autumn the sunshine duration showed an upward trend, the spring increase was obvious, while there was a decreasing trend in summer and winter. The sunshine duration had a negative correlativity with annual precipitation, vapour pressure and relative humidity, correlation index were -0.34, -0.27 and -0.51, respectively, while it had a positive correlativity with wind speed.