| 黄河三角洲典型城市夏季臭氧污染特征与敏感性分析 |
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| 引用本文： | 赵敏,申恒青,陈天舒,李吉东,孙忠泉,纪元元,薛丽坤,李红,王文兴,尚凡一.黄河三角洲典型城市夏季臭氧污染特征与敏感性分析[J].环境科学研究,2022,35(6):1351-1361. |
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| 作者姓名： | 赵敏 申恒青 陈天舒 李吉东 孙忠泉 纪元元 薛丽坤 李红 王文兴 尚凡一 |
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| 作者单位： | 1.山东大学环境研究院，山东 青岛 266237 |
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| 基金项目： | 东营市细颗粒物和臭氧协同防控示范研究(No.DQGG202121)；山东省自然科学基金(No.ZR2019JQ09)；中国博士后科学基金(No.2021M691921) |
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| 摘 要： | 为探究黄河三角洲代表性城市东营市夏季环境空气臭氧(O3)污染成因，利用2021年6月东营市大气超级站监测数据与基于观测的化学盒子模型(OBM)，较为全面地分析了O3污染特征与O3生成敏感性机制，并开展了前体物减排效果评估. 结果表明:①2021年6月东营市O3污染较严重，O3污染天〔日最大8 h平均O3浓度值(MDA8-O3)≥160 μg/m3〕占比达50.0%，MDA8-O3、挥发性有机物(VOCs)和氮氧化物(NOx)浓度平均值较非污染天分别升高70.0%、10.4%和7.6%. ②O3污染天呈高温、低湿的特点，O3浓度与温度的相关性在污染天显著增强. ③基于本地化的O3生成潜势计算表明，与非污染天相比，污染天异戊二烯、乙烯和甲苯对O3生成潜势的贡献分别增加了114.3%、68.6%和38.2%. ④污染天O3本地净生成速率明显升高. O3生成处于VOCs-NOx协同控制区，减少VOCs和NOx排放均可有效降低O3生成. 研究显示，现阶段东营市应实施VOCs/NOx协同减排比例大于或等于1∶1的减排策略，污染天(尤其是夜间)应加大NOx及VOCs减排力度，减轻污染天温度升高及植物源排放增加等不可控因素对O3污染的影响.
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| 关 键 词： | 环境空气臭氧 臭氧生成潜势 敏感性分析 基于观测的化学盒子模型(OBM) 黄河三角洲 |
| 收稿时间： | 2021-11-12 |
Characteristics and Sensitivity Analysis of Ozone in the Representative City of the Yellow River Delta in Summer |
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| Affiliation: | 1.Environment Research Institute, Shandong University, Qingdao 266237, China2.Dongying Ecological and Environmental Monitoring Center, Dongying 257000, China3.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China4.Dongying Ecological and Environmental Bureau, Dongying 257091, China |
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| Abstract: | In order to understand the formation of ambient ozone (O3) pollution in the representative city of Dongying in the Yellow River Delta in summer, a comprehensive analysis of O3 pollution characteristics, O3 formation mechanisms and the emission reduction effects of O3 precursors was conducted based on measurements made at the Dongying station and an Observation Box Model (OBM) in June, 2021. The results showed that: (1) The O3 polluted days (defined as the daily maximum 8-h average concentration of O3 (MDA8-O3) ≥ 160 μg/m3) were up to 50.0% in June, 2021. During O3 polluted days, the average concentrations of MDA8-O3, volatile organic compounds (VOCs), and nitrogen oxides (NOx) were 70.0%, 10.4% and 7.6% higher than during the clean days, respectively. (2) O3 polluted days are characterized by high temperature, low relative humidity, and strong correlation of O3 with temperature. (3) Based on the local maximum incremental reactivity values, the contributions of isoprene, ethene, and toluene to O3 formation increased by 114.3%, 68.6% and 38.2%, respectively, during the polluted days. (4) During the O3 polluted days, net O3 production rates increased significantly, and O3 formation was sensitive to both VOCs and NOx. This study reveals the severe O3 pollution in Dongying in June, 2021 and demonstrates that the synergistic emission reduction ratio of VOCs and NOx should be greater or equal to 1:1. During the O3 polluted days (especially at night), emission reduction of NOx and VOCs should be strengthened to reduce the deterioration of O3 caused by uncontrollable factors such as temperature and biological sources. |
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