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武汉市夏季大气挥发性有机物实时组成及来源
摘要点击 662  全文点击 130  投稿时间:2021-09-03  修订日期:2021-11-04
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中文关键词  挥发性有机物(VOCs)  实时源解析  日变化  臭氧生成潜势(OFP)  浓度权重轨迹(CWT)
英文关键词  volatile organic compounds(VOCs)  real-time source apportionment  diurnal variation  ozone formation potential(OFP)  concentration weighted trajectory(CWT)
作者单位E-mail
苏维峰 中国地质大学(武汉)环境学院, 武汉 430078 2682824991@qq.com 
孔少飞 中国地质大学(武汉)环境学院, 武汉 430078
湖北省大气复合污染研究中心, 武汉 430072 
kongshaofei@cug.edu.cn 
郑煌 中国地质大学(武汉)环境学院, 武汉 430078
湖北省大气复合污染研究中心, 武汉 430072 
 
陈楠 湖北省大气复合污染研究中心, 武汉 430072
湖北省生态环境监测中心站, 武汉 430072 
 
祝波 湖北省大气复合污染研究中心, 武汉 430072
湖北省生态环境监测中心站, 武汉 430072 
 
全继宏 湖北省大气复合污染研究中心, 武汉 430072
湖北省生态环境监测中心站, 武汉 430072 
 
祁士华 中国地质大学(武汉)环境学院, 武汉 430078
湖北省大气复合污染研究中心, 武汉 430072 
 
中文摘要
      利用在线监测仪器获取了武汉市2019年6~7月环境大气中102种挥发性有机物(VOCs)小时浓度数据.观测期间ρ(VOCs)范围为24.9~254 μg·m-3,平均值为(67.7±32.2)μg·m-3.依据臭氧浓度标准,将观测期间划分为清洁日和污染日,对比分析清洁日和污染日气象条件、VOCs浓度、组成、臭氧生成潜势和来源差异.污染日NOx、CO和VOCs的平均值分别超出清洁日34.9%、25.0%和27.8%.污染日烷烃、烯烃、芳香烃和含氧VOCs分别比清洁日高40.7%、39.5%、26.9%和21.5%.污染日总臭氧生成潜势为(102±69.6)μg·m-3,超出清洁天33.5%.污染日液化石油气燃烧、工业排放、机动车排放、天然源和溶剂使用的平均贡献率分别比清洁日低3.4%、2.5%、0.2%、1.3%和1.4%,油气挥发源平均贡献率比清洁日高8.8%.机动车排放源和油气挥发源的日变化均呈现早晚高、午后低的特征,与早晚高峰排放有关;LPG燃烧的日变化与餐饮油烟排放变化一致.浓度权重轨迹表明武汉市污染日VOCs来源主要为本地排放和东北方向传输.O3污染日,油气挥发源和LPG燃烧源应作为武汉市夏季O3污染防控的重点.
英文摘要
      The hourly concentrations of 102 volatile organic compounds (VOCs) in Wuhan from June to July in 2019 were obtained using an online monitoring instrument. The ρ(VOCs) varied from 24.9 to 254 μg·m-3, with a mean value of (67.7±32.2) μg·m-3. According to the air quality standard of ozone, the observation period was divided into clean and polluted episodes of O3. The differences in meteorological parameters, VOC concentrations, compositions, sources, and ozone formation potential (OFP) between clean and polluted episodes were analyzed and compared. The average mass concentrations of NOx, CO, and VOCs in polluted periods exceeded those of clean periods by 34.9%, 25.0%, and 27.8%, respectively. The mass concentrations of alkanes, alkenes, aromatic hydrocarbons, and oxygenated volatile organic compounds in polluted periods were higher than those in clean periods by 40.7%, 39.5%, 26.9%, and 21.5%, respectively. The average OFP in polluted periods[(102±69.6) μg·m-3] exceeded that of clean periods by 33.5%. The average contribution rates of LPG combustion, industrial sources, vehicle emissions, natural sources, and solvent usage to VOCs were 3.4%, 2.5%, 0.2%, 1.3%, and 1.4% lower than those of the clean periods, respectively, whereas the gasoline evaporation increased by 8.8% in polluted periods. The contributions of vehicle emissions and gasoline evaporation exhibited higher values in the morning and evening, with lower values in the afternoon, which may have been related to peak vehicles emissions. The contribution of LPG combustion peaked along with the cooking time. The concentration weighted trajectory showed that the main sources of VOCs in polluted periods were from local emissions and surrounding regions in the northeastern direction of Wuhan. In polluted periods, gasoline evaporation and LPG combustion should be emphasized for preventing O3 pollution in the summer in Wuhan.

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