| 金华地区夏秋大气中过氧乙酰硝酸酯的污染特征 |
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| 引用本文： | 孙鑫,唐倩,邹巧莉,金玲玲,宋清川,徐达,田旭东.金华地区夏秋大气中过氧乙酰硝酸酯的污染特征[J].南京气象学院学报,2020,12(6):721-728. |
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| 作者姓名： | 孙鑫 唐倩 邹巧莉 金玲玲 宋清川 徐达 田旭东 |
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| 作者单位： | 浙江省生态环境监测中心, 杭州, 310012,浙江省生态环境监测中心, 杭州, 310012,浙江省生态环境监测中心, 杭州, 310012,浙江省生态环境监测中心, 杭州, 310012,浙江省生态环境监测中心, 杭州, 310012,浙江省生态环境监测中心, 杭州, 310012,浙江省生态环境监测中心, 杭州, 310012 |
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| 基金项目： | 国家重点研发计划（2018YFC0213804） |
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| 摘 要： | 过氧乙酰硝酸酯（PAN）是由VOCs和NOx的光化学反应生成的一种典型二次污染物，比O3更适合作为光化学污染的指示剂.2019年6—10月对浙江中部盆地金华市大气中PAN进行了在线监测，并对影响其体积分数变化的因素进行了分析，同时还分析了一次典型的光化学污染过程.结果表明，观测期间PAN的平均体积分数为0.656×10-9，最高体积分数为4.348×10-9，日均体积分数水平在0.130×10-9~2.203×10-9之间.PAN日变化特征显著，9月为明显的双峰变化，其他月份均为单峰.受气象条件的影响，夏季的污染程度显著低于秋季.9月27—30日典型污染时段内，PAN的小时均值是整个观测期均值的2.8倍，污染以本地积累为主.前体物浓度水平差异与去除机制的不同是影响PAN和O3相关性的重要因素，此外NO/NO2的比值是影响PAN生成速率的重要因素，PAN的峰值基本出现在NO/NO2比值较低的时段.在生成PAN的VOCs物种中，丙烷、乙烷和间/对二甲苯所占比例较大.
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| 关 键 词： | 过氧乙酰硝酸酯 光化学烟雾 大气污染特征 在线监测 |
| 收稿时间： | 2020/7/22 0:00:00 |
Characteristics of atmospheric PAN pollution in Jinhua during summer and autumn |
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| SUN Xin,TANG Qian,ZOU Qiaoli,JIN Lingling,SONG Qingchuan,XU Da and TIAN Xudong.Characteristics of atmospheric PAN pollution in Jinhua during summer and autumn[J].Journal of Nanjing Institute of Meteorology,2020,12(6):721-728. |
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| Authors: | SUN Xin TANG Qian ZOU Qiaoli JIN Lingling SONG Qingchuan XU Da and TIAN Xudong |
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| Institution: | Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012,Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012,Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012,Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012,Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012,Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012 and Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012 |
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| Abstract: | Peroxyacetyl nitrate (PAN) is a typical secondary product of VOCs and NOx photochemical reaction,and a better indicator of photochemical smog than O3.The ambient levels of PAN in Jinhua from June to October,2019 were measured by online instrument,and the PAN variation and correlated influencing factors,as well as one typical photochemical pollution episode were analyzed.The results showed that the average volume fraction of PAN was 0.656×10-9,with maximum value recorded as 4.348×10-9.Daily averaged PAN volume fractions were ranged from 0.130×10-9 to 2.203×10-9.The diurnal variation of PAN was a double-peak pattern in September and a single-peak one in other months.The ambient PAN level in summer was generally lower than that in autumn due to the meteorological influences.During the typical pollution episode from September 27th to September 30th,the hourly mean PAN volume fraction was 2.8 times of that during the whole observation period,and the pollution was dominated by local accumulation.The difference of precursor concentration and removal mechanism were important factors affecting the correlation between PAN and O3,in addition,the ratio of NO/NO2 was an important factor affecting the PAN formation rate,and the peak PAN values appeared during time with low ratio of NO/NO2.Propane,ethane and m,p-xylene were the most important VOCs precursors of PAN. |
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| Keywords: | peroxyacetyl nitrate (PAN) photochemical smog characteristics of atmospheric pollution online monitoring |
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