广西大气中过氧乙酰硝酸酯污染特征研究

Research on characteristics of atmospheric peroxyacetyl nitrate pollution in Guangxi

采用PAN在线监测仪对广西2018年大气中过氧乙酰硝酸酯(PAN)浓度进行监测,并对影响PAN浓度值变化的因素进行了分析。结果显示:(1)广西大气中PAN的日均浓度水平在0.0012.296×10-9之间,其夜间的PAN浓度相对较低,日间PAN浓度相对较高;(2)从PAN的季节性浓度分析结果来看:PAN月均浓度在夏季、秋季较高,在春季、冬季较低;(3)从观测期间PAN浓度与O3、NO的浓度变化趋势来看,PAN与O3的浓度变化趋势基本一致,PAN与O3的两者的峰值均出现在午后阳光最强烈的时候,两者的谷值均出现在凌晨,而NO浓度的日变化趋势与PAN的变化趋势大体上相反。

The concentration of peroxyacetyl nitrate(PAN)in the atmosphere of Guangxi in 2018 was monitored by Pan on-line instrument,and the factors affecting the concentration of PAN were analyzed.The results showed that:(1)The daily average concentration of PAN in the atmosphere of Guangxi is between 0.001 and2.296×10-9,the concentration of PAN is relatively lower at night and relatively higher in the daytime.(2)According to the analysis results of the seasonal concentration of PAN,the monthly average concentration of PAN is higher in Summer and Autumn than Spring and Winter.(3)During the observation period,the concentration change trend of PAN and O3 was basically consistent,and the peak value of both PAN and O3 appeared in the afternoon when the sun was strongest,the wave trough of them appeared in the early morning,and the diurnal variation trend of NO concentration was opposite to that of PAN.