| 成都市春季O3污染特征及关键前体物识别 |
| 摘要点击 2733 全文点击 847 投稿时间：2020-12-31 修订日期：2021-03-17 |
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| 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 characteristics key precursors relative incremental reactivity(RIR) spring Chengdu |
| 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 | |
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| 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NOx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NOx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 NOx) 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 NOx 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 NOx 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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