标題：Long-term variations of ultraviolet radiation in Tibetan Plateau from observation and estimation作者：Simao Peng ; Qingyun Du; Lunche Wang ; Aiwen Lin ; Bo Hu

出版物來源：International Journal of Climatology DOI：10.1002/joc.4051 出版年：8 JUL 2014

摘要：Measurements of ultraviolet radiation (UV) and global solar radiation (G) in Lhasa, Tibetan Plateau, from 2006 to 2012 were used to investigate their seasonal characteristics. The maximum UV irradiation and UV fraction (percentage of UV compared to G, FUV) occurred at noon in summer (July) and the minimum values occurred in winter (December); the annual means of UV and FUV were approximately 0.91 MJ m−2 day−1 and 4.3%, respectively. By analysing the dependence of UV irradiances on clearness index (Kt) and cosine of the solar zenith angle, an efficient all-sky model was developed for estimating UV radiation in Tibetan Plateau. The model was tested at Sanjiang and Donghu stations and produced satisfactory estimates. UV dataset was then reconstructed from G using the newly developed model for the period 1961–2012. It was discovered that annual mean daily UV irradiation was approximately 0.89 MJ m−2 day−1 and there was a significant decreasing trend (at the rate of 0.013 MJ m−2 decade−1) over the last 50 years in the Tibetan Plateau. The largest decrease occurred in autumn (−0.023 MJ m−2decade−1) and a small decrease observed in summer. Meanwhile, results also revealed that UV radiation increased at 0.05 MJ m−2 year−1 from 1989 to 2012, which was inconsistent with the variations of G in the study area. The proposed all-weather UV model is very important for ecological modelling, atmospheric environment, agricultural processes and solar energy applications in the Tibetan Plateau, China.

文獻類型：Article

語種：English

關鍵詞：UV radiation;global solar radiation;sky conditions;clearness index;Tibetan Plateau

通訊作者地址：Qingyun Du; School of Resource and Environmental Science, Wuhan University, Hubei Province, China

電子郵件地址：qydu@whu.edu.cn

地址：

[Simao Peng ;Qingyun Du;Aiwen Lin]School of Resource and Environmental Science, Wuhan University, Hubei Province, China

[Lunche Wang]State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University, Hubei Province, China

[Bo Hu]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

E-ISSN：1097-0088

全文鍊接：http://onlinelibrary.wiley.com/doi/10.1002/joc.4051/full