沈阳市臭氧与前体物的非线性关系及生成潜势研究

【摘要】 利用2019年沈阳市11个环境空气质量监测点位和3个挥发性有机物监测点位污染物浓度观测数据，研究了O₃与前体物（NO_X和VOCs）的非线性关系，计算了二次有机气溶胶（SOA）和O₃生成潜势。结果表明：与NO_X减排相比，VOCs减排对降低O₃浓度的效应要显著得多，这种趋势在春、夏季占比高达84.5%；而仅减排NO_X或NO_X减排比例大于VOCs，反而会造成O₃浓度升高。对O₃生成潜势贡献由大到小的VOCs依次是芳香烃、烯烃和烷烃，甲苯和异戊二烯是贡献率最大的两个物种。对SOA生成潜势贡献由大到小的VOCs依次是芳香烃、烷烃和烯烃，甲苯和苯的合计贡献高达70%以上。更多还原

【Abstract】 Using the 2019 pollutant concentration observation data from 11 environmental air quality monitoring sites and 3 volatile organic compound monitoring sites in Shenyang,the nonlinear relationship between O₃ and its precursors（NO_Xand VOCs） was studied,and the potential for secondary organic aerosols （SOA） and O₃ generation was calculated.The results show that compared with NO_Xreduction,VOCs reduction has a much more significant effect on reducing O₃ concentration,with this trend accounting for up to 84.5% in spring and summer;However,only reducing NO_X or a higher proportion of NO_X emissions than VOCs can actually cause an increase in O₃ concentration.The VOCs with the highest potential contribution of O₃ generation in descending order are aromatic hydrocarbons,olefins,and alkanes,with toluene and isoprene being the two species with the highest contribution rates.The VOCs that contribute to the potential of SOA generation in descending order are aromatic hydrocarbons,alkanes,and olefins,with toluene and benzene contributing over 70% in total.更多还原