• 关键词：珠三角  挥发性有机物  二次有机气溶胶  化学反应活性  轨迹聚类

• 基金项目：广东省重点领域研发计划项目（No.2020B1111360003）；广东省科技计划项目（科技创新平台类）（No.2019B121201002）

• 廖彤
• 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，广东省环境保护大气二次污染研究重点实验室，广州 510308;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275

• 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，广东省环境保护大气二次污染研究重点实验室，广州 510308;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275

• 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，广东省环境保护大气二次污染研究重点实验室，广州 510308;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275

• 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，广东省环境保护大气二次污染研究重点实验室，广州 510308;广东省环珠江口气候环境与空气质量变化野外科学观测研究站，广州 510275

• 王新明
• 中国科学院广州地球化学研究所，有机地球化学国家重点实验室，广州 510640

• 摘要：于2016年在广东大气超级监测站，开展4个季节的VOCs、O₃和PM_2.5长时间、高分辨率的连续观测，共获得2142组有效数据，并利用OH消耗速率（L_OH）、臭氧生成潜势（OFP）和二次有机气溶胶生成潜势（SOAFP）3种评价方法以及HYSPLIT模型，分析珠三角典型地区大气污染时段VOCs特征及化学反应活性.结果表明，PM_2.5高值时段，除异戊二烯外，其余各种VOCs的平均浓度水平高于O₃高值时段.3种情境中，VOCs化学反应活性由强到弱依次为PM_2.5高值时段、观测期间、O₃高值时段.在O₃高值时段，来自珠三角东部地区气团中VOCs的浓度水平最高，而来自珠江西岸气团中VOCs的L_OH和OFP最高，其次为来自珠三角东部的气团，这说明在珠江西岸和珠三角东部地区有大量的强化学反应活性污染物排放.来自北方内陆地区气团中苯系物占比较高，其SOAFP最高.在PM_2.5高值时段，来自南部海洋气团中VOCs的混合比、L_OH、OFP和SOAFP均最高，其次为来自东北内陆地区气团中VOCs的OFP和SOAFP.来自粤西南地区的气团，由于苯系物和低碳烯烃占比达到50%，其L_OH仅次于来自于南部海洋的气团.

• Abstract：A long-term and high-resolution observation of VOCs， O₃ and PM_2.5 at Guangdong Atmospheric Supersite （GAS） was conducted in four seasons in 2016， and a total of 2142 sets of valid data were obtained； by employing three evaluation methods of OH loss rate （L_OH）， Ozone Formation Potential （OFP） and Secondary Organic Aerosol Formation Potential （SOAFP） and HYSPLIT model， characteristics and chemical reactivity of VOCs during air pollution process in typical areas of the Pearl River Delta were analyzed. The results showed that the average concentrations of VOCs except isoprene were higher during the period of high PM_2.5 than during the time of high O₃.The chemical reactivities of VOCs in the order of strong to weak were the period of high PM_2.5， the observation periods and the time of high O₃. During the high concentration periods of O₃， the highest concentration of VOCs were in the air masses from the eastern Pearl River Delta （PRD） region， while the highest L_OH and OFP of VOCs were found in the air masses from the west coast of the PRD region， followed by the air masses from the eastern PRD region， indicating that a large amount of pollutants with strong chemical reactivity were emitted in the western and the eastern PRD regions. The highest SOAFP was found in the air masses from the northern inland region with a high benzene series. During the period of high PM_2.5， the mixing ratio of VOCs， L_OH， OFP and SOAFP were highest in the air masses from the southern ocean， followed by OFP and SOAFP of VOCs in the air masses from the northeast inland areas. The air masses from the southwest of Guangdong Province are second only to those from the southern ocean in terms of L_OH due to the 50% share of benzene series and low carbon olefins.

• Key words：Pearl River Delta  volatile organic compounds  secondary organic aerosol  chemical reactivity  trajectory clustering

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