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Xinjiang Normal University (2010)

The Study on Solar Ultraviolet Radiation Characteristics in Tazhong Area of Taklimakan Desert

金莉莉; Jin Li Li

Titre : The Study on Solar Ultraviolet Radiation Characteristics in Tazhong Area of Taklimakan Desert

Auteur : 金莉莉; Jin Li Li

Grade : Master’s Theses 2010

Université : Xinjiang Normal University

Résumé
In this paper, the characteristics and influencing factors of solar ultraviolet radiation ,the relationship between ultraviolet radiation and global radiation, variation ultraviolet radiation and properties of ratio of ultraviolet radiation to global radiation on different sky conditions,the estimation equation developed in this study,ultraviolet radiation data for calculating the total ozone amount and checkout in Taizhong station are analyed on the basis of the solar ultraviolet radiation ,global data observed from Jan.to Dec.2007,the reflect radiation and scatter radiation from Apr. to May 2007,ground weather data over the Taklimakan desert hinterland.The results are as fllows :(1)The monthly total UV-radiation and UV-B radiation are 305.64 MJ·m-2·a-1 and 8.59 MJ·m-2·a-1.The monthly total maximum(minimum) of UV-radiation appears in Jul.(Dec).The UV-radiation(UV-B radiation) in winter is 2/5(1/4) in summer. The peak value of UV radiation (UV-B radiation) instantaneous radiant intensity is 66.9 W·m-2 (2.51W·m-2 )appears in June.(2)The annual mean value is 4.99%.The average change range is 4.16 percent to 5.9 percent of the ratio of the UV to global radiation.The maximum(minimum) ratio of the UV-radiation to global radiation appears in summer(winter).The mediacy ratio of the UV radiation to global radiation appears in spring and autumn.The ratio gradually increase (decreases) along with the total cloud cover(sand) increasing.The relationship between their ratio and global radiation has obvious season variation. The maximum(minimum) ratio appears in summer is 5.5%(spring is 4.5%),also is 4.5% in winter,is 4.7% in autumn.(3)The affect of cloud cover and sand dust is great.The UV-radiation gradually decreases along with the total cloud cover increasing.Compared with clear sky,the UV-radiation and UV-B radiation reduced respectively by 31.68% and 33.69% when total cloud≥8,they reduced respectively by 15.74% and 16.89% when total cloud between 6 to 8,they reduced respectively by 11.64% and 13.15% when total cloud between 3 to 5 Compared with clear sky,the mean UV-radiation reduced respectively by 23.63% and 12.53% under Sc and Ci cloud,the mean UV-B radiation reduced respectively by 17.47% and 14.31% under Sc and Ci cloud.The UV-radiation and UV-B radiation reduced remarkably in sand blown weather,and it is smallest in sand storm.The UV-radiation and UV-B radiation reduced respectively by 11.91% and 14.68% under sand blown weather.they reduced respectively by 41.91% and 44.32% under sand stom weather.The UV-B radiation reduced remarkably than UV-radiation under cloudy day and sand blown day.(4)There are the remarkable plus correlations between ultraviolet radiation and global radiation.The relationship of ground temperature and ultraviolet radiation is remarkable.The estimate equations are steady and credible,they can predict Ultravio- let radiation each season.Using the data of scatter radiation,reflect radiation, ultravio-let radiation,ground weather data from April,9th to May 20th in 2007,their phase linearity regression show that the mostly influencing factor is scatter,the second is actinochemistry,the last is UV-radiation in Taizhong

Mots clés : Taklimakan Desert; UV-radiation; Ratio;

Présentation (CNKI)

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