中文关键词臭氧(O₃)污染特征关键前体物相对增量反应活性(RIR)春季成都市 英文关键词ozone(O₃)pollution characteristicskey precursorsrelative incremental reactivity(RIR)springChengdu

作者	单位	E-mail
韩丽	四川省生态环境科学研究院, 成都 610041	20676746@qq.com
陈军辉	四川省生态环境科学研究院, 成都 610041 清华大学环境学院, 北京 100084	9503062@qq.com
姜涛	四川省生态环境科学研究院, 成都 610041
徐晨曦	四川省生态环境科学研究院, 成都 610041
李英杰	四川省生态环境科学研究院, 成都 610041
王成辉	四川省生态环境科学研究院, 成都 610041
王波	四川省生态环境科学研究院, 成都 610041
钱骏	四川省生态环境科学研究院, 成都 610041
刘政	四川省生态环境科学研究院, 成都 610041

中文摘要 2018年4月在成都市区开展了臭氧（O₃）以及挥发性有机物（VOCs）等污染物的在线监测，搜集了成都市国控站点数据，对O₃污染特征进行分析，利用增量反应活性（RIR）的方法识别了O₃生成的关键前体物.结果表明，成都市2016~2018年的4月的O₃污染程度逐年加重，O₃日变化呈现单峰态；当温度大于20℃，风速处于1~1.5 m·s^-1，相对湿度小于65%时，O₃超标率在4月会高于80%；2018年4月，O₃超标天的NO_x日均浓度是非超标天的2.3倍，VOCs日均浓度是非超标天的2倍；人为源VOCs、CO、天然源VOCs和NO_x这4大类前体物在臭氧超标天对O₃的RIR值依次为2.4、0.87、0.06和-2.6，说明O₃处于VOCs控制区；从VOCs物种来看，间/对-二甲苯、乙烯、反-2-丁烯、丙烯、邻-二甲苯、甲苯、丙酮、异戊二烯、异戊烷和正丁烷等为O₃生成的关键活性VOCs物种. 英文摘要 To study the characteristics of O₃ pollution and identify the key precursors for O₃ formation in Chengdu in spring, O₃ concentrations in April between 2016 and 2018 were analyzed, and on-line measurements of O₃ and the precursors(VOCs and NO_x) were also studied at an urban site. The results showed that the O₃ pollution level in April increased year by year, and diurnal variations showed a unimodal distribution. When the ambient temperature was more than 20℃, the wind speed was between 1 and 1.5 m·s^-1, and the relative humidity was less than 65%, the probability of O₃ pollution occurring in April was more than 80%. In April 2018, the average concentrations of NO_x and VOCs during O₃ pollution days were 2.3-times and 2-times higher than non-pollution days. Furthermore, an OBM method was used to calculate the RIR values of different ozone precursors. This showed that the RIR values of anthropogenic VOCs, CO, biogenic VOCs, and NO_x for ozone were 2.4, 0.87, 0.06, and -2.6, respectively, indicating that O₃ formation in Chengdu was generally VOC-limited. The RIR values of the VOC species showed that m/p-xylene, ethylene, trans-2-butane, propylene, o-xylene, toluene, acetone, isoprene, isopentane, and n-butane were the key active VOC species of ozone formation.

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