乌鲁木齐市冬季空气质量变化对太阳辐射的影响

The Influence of Air Quality Change on Solar Radiation in Winter of Urumqi

对乌鲁木齐市2016~2020年近5年冬季逐日的太阳辐射资料和同期PM_(10)、PM_(2.5)、O_(3)、NO_(2)污染物浓度及环境空气质量指数AQI进行统计分析。结果表明:1)2016~2020年近5年冬季PM_(2.5)年浓度和超标天数变化均呈现波动下降,对应同期太阳直接辐射呈下降趋势,散射辐射基本呈上升趋势。2)PM_(2.5)与太阳直接辐射在11月、12月、2月成反相关关系,O_(3)小时质量浓度与直接辐射成正相关关系;散射辐射与PM_(2.5)、PM_(10)在11月、12月、1月均为正相关关系,散射辐射与O_(3)、NO_(2)在大部分时间也表现为正相关关系。3)2月水汽压和散射辐射均呈现逐渐上升趋势,两者线性正相关系数为0.4006,水汽含量与散射辐射有一定的相关性,表明随着水汽压增大,散射辐射增强。4)2019~2020年较2017~2018年冬季AQI平均下降19.0%,大气混浊因子平均下降61.2%,AQI的小幅下降,可能引起大气混浊因子的大幅下降。

The daily solar radiation data,pollutant concentrations that were PM_(10),PM_(2.5),O_(3),NO_(2),and ambient air quality index(AQI)in winter of Urumqi from 2016 to 2020 were done statistical analysis.The results showed as follow.(1)The annual concentration of PM_(2.5) and the number of days exceeding the standard in winter showed a fluctuating decline,and the solar direct radiation showed a decreasing trend in the corresponding period,while the scattered radiation basically showed an increasing trend from 2016 to 2020.(2)PM_(2.5) was inversely correlated with direct solar radiation in November,December and February,while O_(3) hourly mass concentration was positively correlated with direct radiation.The scattered radiation was positively correlated with PM_(2.5) and PM_(10) in November,December and January,and the scattered radiation was also positively correlated with O_(3) and NO_(2) in most of the time.(3)In February,both water vapor pressure and scattered radiation showed a gradual upward trend,the linear positive correlation coefficient was 0.4006,There was certain correlation between water vapor content and scattered radiation,indicating that the scattered radiation increased with the increase of water vapor pressure.(4)Compared with the winter of 2017~2018,the AQI decreased by 19.0%and the atmospheric turbidity factor decreased by 61.2%on average,in 2019~2020.A small decrease of AQI might cause a significant decrease of atmospheric turbidity factor.