苏皖鲁豫典型城市过氧乙酰硝酸酯(PAN)污染特征分析

Analysis of photochemical pollution potential characteristics based on PAN observation in the border area of Jiangsu,Anhui,Shandong and Henan

为探究苏皖鲁豫区域光化学污染特征,于2021年10月和2022年6月在淮北市开展光化学污染产物过氧乙酰硝酸酯(peroxyacetyl nitrate,PAN)的在线监测,分析了PAN浓度特征、空间来源、产生速率和变化趋势.观测结果表明,观测处2021年10月PAN的浓度范围为(0.08—1.44)×10^(−9),2022年6月的浓度范围为(0.61—5.72)×10^(−9);PAN的峰值大部分出现在NO/NO_(2)比值较低的时段.结合气团后向轨迹,2021年10月观测处PAN的潜在源贡献函数(PSCF)高值区范围出现在南部方向,可能是因为西南方向相近城市较高的前体物排放;2022年6月高值区主要出现在北部和东南部,显示山东省西南部是潜在源贡献地区,东南方向的气团在工业化程度较高的城市群之间存在长距离运输.

In order to explore the potential of photochemical pollution in the regions of Jiangsu,Anhui,Shandong and Henan,the online monitoring of peroxyacetyl nitrate(PAN),a product of photochemical pollution,was carried out in Huaibei City in October 2021 and June 2022,and the concentration characteristics,spatial sources,production rate and change trend of PAN were analyzed.The observation results show that the concentration range of PAN at the observation site is(0.08—1.44)×10^(−9)in October 2021 and(0.61—5.72)×10^(−9)in June 2022.Most of the peak of PAN appeared in the period of low NO/NO_(2)ratio.In combination with the backward trajectory of the air mass,the high value range of the potential source contribution function(PSCF)of PAN at the observation site in October 2021 appears in the south,which may be due to the higher precursor emissions in the cities near the southwest.In June 2022,the high value areas mainly appeared in the north and southeast,indicating that the southwest of Shandong Province is a potential source contribution area,and the air mass in the southeast has long distance transportation between the urban agglomerations with a high degree of industrialization.