SPATIO-TEMPORAL CHANGE OF SUNSHINE DURATION AND ITS INFLUENCE FACTORS IN CHANG TANG NATURE RESERVE OF TIBET FROM 1971 TO 2019

Du Jun; Gao Jiajia; Ciwangdunzhu

doi:10.19912/j.0254-0096.tynxb.2020-0306

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (2) : 287-295. DOI: 10.19912/j.0254-0096.tynxb.2020-0306

SPATIO-TEMPORAL CHANGE OF SUNSHINE DURATION AND ITS INFLUENCE FACTORS IN CHANG TANG NATURE RESERVE OF TIBET FROM 1971 TO 2019

Du Jun^1,2, Gao Jiajia^1,2, Ciwangdunzhu³

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Abstract

Using the monthly data of sunshine duration, total cloud cover, relative humidity, vapor pressure and wind speed data collected from 5 meteorological stations in Chang Tang Nature Reserve of Tibet （CTNRT） from 1971 to 2019, spatio-temporal change of annual and seasonal sunshine duration and its influence factors were analyzed using the methods of the linear tendency estimation, M-K test and principal component analysis. The results show that 1） The annual sunshine duration of each station are from 2839. 2 to 3574. 5 hours in CTNRT, which is increasing from east to west. The sunshine duration is less than in Qaidam basin of Qinghai province and most area of Xigaze city in Tibet, but more than in eastern Tibet, the mountains of southern Tibet and the eastern Qinghai-Tibet Plateau; 2） In the recent 49 years, the annual sunshine duration shows significant decrease trend with a rate of 22. 8 h/10a in CTNRT, especially in summer. Since the 1990s, the seasonal sunshine duration shows an obvious decreasing tendency, with the largest reduction in summer, followed by spring, and the annual sunshine duration decreased even more, reaching 54.1 h/10 a; 3） On the inter-decadal scale, the annual sunshine duration shows the change characteristics of less in 1970s, more in 1980s-1990s and significantly less in 2000 s; 4） According to the Mann-Kendall test, the annual sunshine duration has a mutation in 2016 in CTNRT, it is 21 years later than in Qaidam basin. In terms of seasonal sunshine duration, there is no abrupt change in autumn and winter, while it occurrs in spring and summer in 2015 and 2008 respectively; 5） The principal component regression analysis shows that the dominant factor affecting annual sunshine duration in CTNRT is total cloud cover, followed by the mean wind speed, while the dominant factor is the total cloud cover in all season.

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sunshine duration / influencing factor / principal component analysis / spatial and temporal distribution / mutation / Chang Tang nature reserve of Tibet

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Du Jun, Gao Jiajia, Ciwangdunzhu. SPATIO-TEMPORAL CHANGE OF SUNSHINE DURATION AND ITS INFLUENCE FACTORS IN CHANG TANG NATURE RESERVE OF TIBET FROM 1971 TO 2019[J]. Acta Energiae Solaris Sinica. 2022, 43(2): 287-295 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0306

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