东疆黑戈壁太阳紫外辐射变化特征

Evolution of Solar Ultraviolet Radiation on Dark Gobi,Eastern Xinjiang

利用东疆红柳河黑戈壁下垫面陆气相互作用观测站2017年太阳紫外辐射、总辐射和气象站天气现象观测数据,对东疆黑戈壁不同时间尺度和不同天气背景下的太阳A波段紫外辐射(UVA)和B波段(UVB)的变化特征进行了分析。结果表明:紫外辐射UVA和UVB日变化呈正态分布,UVA、UVB最大瞬时辐照度为67.97、2.15 W·m-2,最大曝辐量为2.09、0.05 MJ·m-2,年曝辐量为400.31、8.63 MJ·m-2;季节变化呈现夏季高、冬季低、春季高于秋季的特点;年变化呈现倒"U"型,年变化幅度呈夏季大、冬季小的趋势。紫外辐射占总辐射的比例呈夏高冬低的特点。不同天气下,其比例变化幅度也不相同,晴天大于雨天。太阳紫外辐射的月和年平均量以及紫外辐射年均值占总辐射年均值的比例,东疆黑戈壁地区都明显高于其他地区。

The characteristics of solar ultraviolet radiation A-band(UVA)and ultraviolet radiation Bband(UVB)in different time scales and different weather backgrounds for Hongliu River Dark Gobi area of the eastern Xinjiang was analyzed by used the solar ultraviolet radiation,total radiation and meteorological station data of the Land-Air interaction observatory in 2017.The results showed that:The daily changes of UVAand UVBare normally distributed.The maximum instantaneous irradiance of UVAand UVBis 67.97 W·m-2,2.15 W·m-2,the daily maximum exposure is 2.09 MJ·m-2 and 0.05 MJ·m-2,the annual exposure is 400.31 MJ·m-2 and 8.63 MJ·m-2.Seasonal changes are characterized by high in summer,low in winter,and higher in spring than autumn.The annual changes show an inverted U pattern,and annual variation range is large in summer and small in winter.The proportion of ultraviolet radiation in the total radiation is high in summer and low in winter.The ranges of proportions are different under different weather conditions with higher range in sunny days than in rainy days.The monthly and annual average amount of solar ultraviolet radiation,and the ratio of the annual average value of ultraviolet radiation to the total annual average value of radiation in Dark Gobi desert are significantly higher than those in other regions.