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| Percentage of Solar Ultraviolet Radiation to Total Radiation in Dunhuang Area |
| Received:June 22, 2018 Revised:August 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.08.019 |
| KeyWord:total irradiance ultraviolet irradiance ultraviolet radiation ratio ANOVA |
| Author | Institution |
| HUANG Xun-yao |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| TANG Qi-huan |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| XU Wen-qing |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| Objective To estimate the solar ultraviolet radiation in Dunhuang area and provide reference for aging test and evaluation of polymer materials and products in this area. Methods Based on the measured data of ultraviolet radiation and total radiation at Dunhuang Experimental Station, the calculation method of the ultraviolet-total percentage at the beginning of sunrise and sunset were discussed. The variance analysis was used to study the ultraviolet-total percentage in Dunhuang with seasons and Beijing time. The average and standard deviation of the ultraviolet-total percentage in the four seasons and the whole year of Dunhuang were given. Results At the beginning of sunrise and sunset, the ultraviolet-total percentage was very large. The calculation method, the judgment and processing of abnormal data would cause great error to the calculation result of the ultraviolet-total percentage. The small solar height angle was the main reason for the obvious difference of the ultraviolet-total percentage in Dunhuang in different Beijing time; and the main reason for the obvious difference in the Ultraviolet-total percentage in different seasons of Dunhuang was much rainfall in summer. Conclusion The ultraviolet-total percentage should be excluded as abnormal data at the beginning of sunrise and sunset. The ratio in winter is the highest. The lowest in summer, and similar in spring and autumn, which lies between winter and summer, and the ratio in mid-afternoon period is higher than that in the morning and the evening. The annual average and the standard deviation of the ratio in Dunhuang area is 5.5% and 1.3% respectively. |
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