本文利用 2005～2020年北京地区观测得到的辐射资料,揭示近十多年来北京地区紫外辐射的变化规律,同时对影响紫外辐射长期变化的主要因子进行了分析.结果表明,紫外辐射呈现出明显的日、季节变化特征.日变化呈现出单峰的变化规律,在正午时出现一天中的极大值,而早晚则是低值时段,极大值和极小值分别出现在中午 12时(北京时,下同;16.26 W m-2)和上午 08时(5.64 W m-2).紫外辐射从春季开始逐渐增强,到夏季出现一年中的极大值,随后开始下降,直到冬季出现一年中的极小值,月均极大值和极小值分别出现在 6月(12.17 W m-2)和 12月(5.4 W m-2).紫外辐射年均值为 9.74 W m-2.紫外辐射与晴空指数呈现正相关,与气溶胶光学厚度和大气细颗粒物PM2.5 呈现负相关.
Analysis and Study on Long Term Variation Characteristics of Ultraviolet Radiation in Beijing Area
This article uses radiation data observed in the Beijing area from 2005 to 2020 to reveal the changing patterns of ultraviolet radiation(UV)in the past decade.At the same time,the main factors affecting the long-term changes of ultraviolet radiation in the Beijing area are analyzed.The results show that UV radiation shows obvious daily and seasonal variation trends.The daily variation shows a single-peak variation pattern,with the maximum value of the day occurring at noon(16.26 W m-2)and low values occurring in the morning and evening[minimum value(5.64 W m-2)occurring at 0800 BJT].UV radiation gradually increases from spring to the maximum value of the year in summer and then starts to decrease until the minimum value of the year in winter,with the monthly average maximum and minimum values being in June(12.17 W m-2)and December(5.4 W m-2),respectively.The annual average UV radiation is 9.74 W m-2.UV radiation shows a positive correlation with the clearness index and a negative correlation with the aerosol optical depth and atmospheric PM2.5(fine particulate matter).
万方数据
维普
