| 基于高分辨率强化观测的亚运会期间杭州市PM2.5和O3污染成因分析 |
| 摘要点击 1078 全文点击 142 投稿时间：2024-02-20 修订日期：2024-05-18 |
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| 中文关键词 细颗粒物（PM2.5） 臭氧（O3） 挥发性有机物（VOCs） 化学组分 有机气溶胶（OA） |
| 英文关键词 fine particulate matter（PM2.5） ozone（O3） volatile organic compounds（VOCs） chemical composition organic aerosol（OA） |
| 作者 | 单位 | E-mail | | 严仁嫦 | 浙江省杭州生态环境监测中心, 杭州 310007 | yrc_zju@163.com | | 来勇 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 张天 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 金嘉佳 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 林旭 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 王蕴赟 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 帅启凡 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 费罗兰 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 沈建东 | 浙江省杭州生态环境监测中心, 杭州 310007 | 7724522@qq.com | | 叶旭红 | 浙江省杭州生态环境监测中心, 杭州 310007 | | | 朱书慧 | 上海市环境科学研究院, 上海 200003 | |
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| 中文摘要 |
| 基于2023年9月1日至10月27日期间的PM2.5有机分子示踪物、醛酮类OVOCs组分、长链烷烃类IVOCs组分以及大气氧化性关键物种等高分辨率强化观测数据,分析亚运会期间杭州市PM2.5和O3污染成因. 以观测期间ρ（PM2.5）日均值超35 μg·m-3或O3日最大8 h浓度超160 μg·m-3为标准筛选污染过程,并根据气流轨迹将这些污染过程分为东北偏北传输型（T1）、东南偏东传输型（T2）、西北传输型（T3）和静稳型（T4）这4类. 结果表明,T2污染呈现较强的PM2.5和O3复合污染特征,长链烷烃、萜类等活性VOCs组分在大气环境中发生光化学氧化反应是该类型PM2.5和O3污染的主因. T1和T3污染,VOCs反应性总体较低,导致O3生成相对较弱；但PM2.5污染成因不同,T1污染受低温高湿气象条件影响,液相氧化过程增强导致其NO3-浓度大幅增长；而T3污染受西北上风向燃煤燃烧和生物质燃烧等排放影响较显著,PM2.5中一次组分占比相对较高. T4污染受局地一次人为源排放影响较显著,应加强对本地餐饮源、移动源排放的治理. |
| 英文摘要 |
| Based on the high-resolution enhanced observation data of PM2.5 organic molecular tracers, aldehydes and ketone OVOC components, long-chain alkane IVOC components, and key species of atmospheric oxidation during September 1 to October 27, 2023, the causes of PM2.5 and O3 pollution in Hangzhou were analyzed. Seven pollution processes were selected with the average daily concentration of PM2.5 exceeding 35 μg·m-3 or the maximum 8-hour concentration of O3 exceeding 160 μg·m-3. Then, these pollution processes were divided into four types： north-northeast transmission type （T1）, east-southeast transmission type （T2）, north-northwest transmission type （T3）, and statically stable type （T4） by airflow trajectory. The research results indicated that the T2 pollution process exhibited strong PM2.5 and O3 composite pollution characteristics and the photochemical oxidation reaction of active VOC components, such as long-chain alkanes and terpenes in the atmospheric environment was the major pollution cause of this type. In the process of T1 and T3 pollution, the overall reactivity of VOCs was low, resulting in relatively weak O3 generation. However, the causes of PM2.5 in these two types of pollution processes were different. T1 pollution was affected by low temperature and high humidity meteorological conditions and the enhanced liquid-phase oxidation process led to a significant increase in nitrate concentration. T3 pollution was significantly affected by emissions from coal combustion, biomass combustion, and other sources, with a relatively high proportion of primary components in PM2.5. The T4 pollution process was significantly affected by local primary anthropogenic emissions, thus the control of local catering source and mobile source emissions must be strengthened. |
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