• 关键词：成都平原  臭氧持续污染  世警会  气象因子  环流形势

• 基金项目：四川省科技计划项目（No.2018SZDZX0023，2018JY0011）；国家重点研发计划项目（No.2018YFC0214002）；成都市科技局技术创新研发项目（No.2018-YF05-00219-SN）

• 雷雨
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 欧奕含
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 张小玲
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 祁宏
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 康平
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 华明
• 成都市气象局, 成都 610072

• 施娟
• 成都市气象局, 成都 610072

• 卢宁生
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 党莹
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 陈欢欢
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 摘要：利用2015-2019年夏季成都平原的空气质量监测数据、气象数据及再分析资料，研究了2019年8月世警会（第十八届世界警察和消防员运动会）期间成都平原持续性高浓度臭氧（O₃）污染特征及其气象成因.结果表明：①2015-2019年夏季成都平原地表O₃-8h （O₃日最大8小时平均浓度）的90百分位呈上升趋势，7月臭氧超标减少，6月上旬和8月中下旬臭氧超标增多；②世警会期间成都平原O₃-8 h平均浓度为（156.26±41.35）μg·m^-3，是近几年8月臭氧污染最严重的一次，具有浓度高、影响范围大的特点；③世警会期间成都平原高浓度臭氧污染的形成主要受槽后西北气流控制，地面为均压场或弱高压，且存在逆温层，大气层结稳定，臭氧污染的空间移动特征与高空槽脊移动特征一致；4气温和相对湿度是影响O₃浓度的主导气象因子，当温度为33~37℃、相对湿度为30%~50%和偏北风或西北风风速为1~2.5 m·s^-1时，容易导致O₃积累，造成区域性污染.

• Abstract：In order to study the persistent high-concentration ozone (O₃) pollution characteristics and meteorological causes of the Chengdu Plain during the World Police Conference (The 18th World Police and Fireman Games) in August 2019, the air quality inspection data, meteorological data, and reanalysis data in the summer of 2015 to 2019 were analyzed. The results showed that:① From 2015 to 2019, the 90th percentile of O₃-8h (the maximum daily average O₃ concentration of 8 hours) over Chengdu Plain presented an increased trend. The ozone exceeding standard in July decreased, while increased in early June and mid-late August; ② The average concentration of O₃-8 h over Chengdu Plain during the World Police Conference was (156.26±41.35) μg·m^-3, which was higher than that in August 2016, with a larger range; ③ The formation of high-concentration ozone pollution during the World Police Conference was mainly controlled by the northwest airflow after the trough. The ground was a pressure field or weak high pressure, and there was an inversion layer or secondary circulation, and the atmosphere is stable. The spatial movement characteristics of ozone pollution were consistent with the high-altitude ridge movement characteristics; 4 Air temperature and relative humidity were the main meteorological factors affected O₃ concentration during the World Police Conference. When temperature ranged 33~37℃, relative humidity ranged 30%~50%, the northerly or northwesterly wind speed ranged 1~2.5 m·s^-1, it was easy to cause O₃ accumulation and to cause regional pollution.

• Key words：Chengdu Plain  persistent ozone pollution  the World Police Conference  meteorological factors  circulation situation

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