中文关键词挥发性有机物(VOCs)臭氧生成潜势(OFP)特征物种后向轨迹天津 英文关键词volatile organic compounds (VOCs)ozone formation potential (OFP)typical speciesbackward trajectoryTianjin

作者	单位	E-mail
姚青	天津市环境气象中心, 天津 300074	yao.qing@163.com
韩素芹	天津市气象科学研究所, 天津 300074
张裕芬	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300350
毕晓辉	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300350
王晓佳	天津市环境气象中心, 天津 300074
蔡子颖	天津市环境气象中心, 天津 300074

中文摘要 挥发性有机物是O₃重要的前体物之一，在O₃生成方面起着决定性作用.为研究天津郊区VOCs特征及其对O₃生成的作用，利用SyntechSpectras GC955在线监测系统监测天津市津南区54种VOCs的浓度，并结合最大增量活性因子计算VOCs的臭氧生成潜力.结果表明，2018年7月津南区VOCs总浓度为（32.33±23.77）μg·m^-3，其中烷烃质量浓度最高，芳香烃和烯烃次之，炔烃最低，丙烷、乙烯和甲苯分列VOCs质量浓度的前3位.观测期间TVOC的OFP为107.81 μg·m^-3，烯烃对OFP的贡献最大，为55.80%，乙烯、异戊二烯和甲苯分列OFP贡献率的前3位.后向轨迹分析表明，不同来向和性质的气团下TVOC及其OFP不同.VOCs/NO_x体积分数比值估算表明，观测期间O₃生成对VOCs较为敏感.乙苯/间，对-二甲苯和乙烷/乙炔等特定物种对浓度比值的变化表明，3次O₃污染过程均伴随VOCs的老化过程. 英文摘要 Volatile organic compounds (VOCs) play an important role in the formation of ozone. The concentrations of VOCs in the Jinnan District of Tianjin were monitored by the Syntech Spectras GC955 online monitoring system, and the ozone generation potential of VOCs was calculated by the maximum incremental activity factor. The results showed that the total concentration of VOCs in the Jinnan District was (32.33±23.77) μg·m^-3, in which the mass concentration of alkane was the highest, and propylene, ethylene and toluene had the highest mass concentration. During the observation period, the ozone formation potential (OFP) of TVOC was 107.81 μg·m^-3, and the contribution of alkenes to OFP was the largest, which was 55.80%. Ethylene, isoprene, and toluene accounted for the first three places of OFP contribution rate. The backward trajectory analysis showed that TVOC and its OFPs were different under different trajectories. The estimation of VOCs/NO_x volume fraction ratio showed that O₃ formation was sensitive to VOCs, which showed that atmospheric photochemical pollution has a considerable degree of regional characteristics. The concentration ratio of ethylbenzene/m,p-xylene, and ethane/acetylene can be used to measure the progress of atmospheric chemical reaction and photochemical age in the air mass, which was proved by the aging process of VOC.

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