• 关键词：臭氧  臭氧生成潜势  后向轨迹分析  潜在源贡献  权重轨迹分析法

• 基金项目：国家重点研发计划（No.2018YFE0106900）；广东省重点研发计划（No.2020B1111360003）；广东省科技计划项目（科技创新平台类）（No.2019B121201002）

• 周炎
• 广东省生态环境监测中心，国家环境保护区域空气质量监测重点实验室，广州 510308

• 陈多宏
• 广东省生态环境监测中心，国家环境保护区域空气质量监测重点实验室，广州 510308

• 林玉君
• 广东省生态环境监测中心，国家环境保护区域空气质量监测重点实验室，广州 510308

• 张涛
• 广东省生态环境监测中心，国家环境保护区域空气质量监测重点实验室，广州 510308

• 翟宇虹
• 广东省生态环境监测中心，国家环境保护区域空气质量监测重点实验室，广州 510308

• 蔡日东
• 广东省生态环境监测中心，国家环境保护区域空气质量监测重点实验室，广州 510308

• 摘要：为探究广东省春季环境空气臭氧（O₃）污染成因，选取2022年4月6—10日的一次典型污染过程，结合后向气流轨迹、潜在源贡献因子 算法和权重轨迹分析法，较为全面地分析了本次污染过程的特征及传输对O₃的影响.结果表明：本次污染范围涉及全省10个城市，污染前期江门市和中山市O₃小时峰值浓度分别高达264 μg·m^-3和272 μg·m^-3，后期东莞市每日O₃小时峰值均高于260 μg·m^-3.以清远市为代表性城市的分析表明，污染天日最大8 h平均O₃浓度、氮氧化物（NO_x）和挥发性有机物（VOCs）浓度平均值较非污染天分别升高10.8%、44.0%和168.0%. O₃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.基于MIR值计算的O₃生成潜势结果表明，与非污染天相比，污染天间、对-二甲苯、乙苯、邻二甲苯和甲苯对O₃生成潜势的贡献分别增加了820%、1670%、614%和174%.气流聚类结果表明，污染前期以东北方向气团为主，污染后期以东南方向气团为主.

• Abstract：In order to investigate the causes of a typical regional ozone （O₃） pollution episode from April 6 to 10，2022 in Guangdong province，the Hybrid Single-Particle Lagrangian Integrated Trajectory model （HYSPLIT），Potential Source Contribution Function （PSCF） and Concentration-weighted Trajectory （CWT） were employed to evaluate the pollution characteristics and the influence of transport.The results showed that the daily maximum 8-hour average concentrations of O₃ in 10 cities of Guangdong exceeded the national standard during this process with high hourly-averaged O₃ peak concentrations at early stage in Jiangmen and Zhongshan of 264 μg·m^-3 and 272 μg·m^-3，respectively，and that at the latter stage in Dongguan of 260 μg·m^-3 .Take Qingyuan as an example， the daily maximum 8-hour average concentration of O₃，mean concentrations of nitrogen oxide （NO_x），and volatile organic compounds （VOCs） on the polluted days were higher than those on non-polluted days by 10.8%，44.0%，and 168.0%，respectively.The polluted days were characterized with higher temperature，lower relative humidity，and siginificantly better correlation between O₃ concentration and temperature.The calculated O₃ formation potential based on MIR values shows that the contribution of m，p-xylene，ethylbenzene，o-xylene，and toluene were obviously larger on the pulloted days than those on non-polluted days by 820%，1670%，614%，and 174%，respectively.The air mass clusters indicate that the air mass from northeast played a dominant role at the early stage，and that from southeast prevailed at the latter stage.

• Key words：ozone  ozone formation potential  backward trajectory analysis  potential source contribution function  concentration-weighted trajectory method

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