PAN Weijun,ZHANG Xiaoling,GONG Shanling,et al.Analysis of the Causes and Sources of Typical Ozone Pollution Processes in Chengdu in 2019[J].Journal of Chengdu University of Information Technology,2023,38(01):98-106.[doi:10.16836/j.cnki.jcuit.2023.01.015]
2019年成都市典型臭氧污染过程的成因与来源解析
- Title:
- Analysis of the Causes and Sources of Typical Ozone Pollution Processes in Chengdu in 2019
- 文章编号:
- 2096-1618(2023)01-0098-09
- Keywords:
- ozone; volatile organic compounds; an observation-based model; local generation analysis; source resolution
- 分类号:
- X511
- 文献标志码:
- A
- 摘要:
- 2019年8月22-29日成都市双流区发生了一次典型的臭氧持续污染事件,本文利用在成都市双流西航港开展的臭氧及其前体物的综合观测资料,探讨此次臭氧污染的成因机制。采用基于观测的模型对局地臭氧的敏感性和收支进行解析,利用正矩阵因子分解法(PMF)模型对挥发性有机物(VOCs)组分进行来源解析,并识别重要的VOCs物种。结果表明,此次污染事件主要是由于有利的气象条件下强局地光化学生成的结果。较优良日,在污染期间的气象条件更有利于臭氧的生成:温度更高、太阳辐射更强、相对湿度和风速更低,风向在180°～270°,前体物浓度更较高,VOCs日均浓度总和为227×10-9; 局地臭氧生成能力更强,日间最大生成速率为78.2×10-9/h,且夜间出现静风的频率更大,更容易积累前体物; 局地臭氧的生成主要受VOCs控制,烯烃对臭氧的生成影响显著且最为敏感,其中乙烯的臭氧生成潜势的贡献占比为52.6%; 机动车排放源(+燃烧源)是VOCs的首要来源,在污染发生前的贡献较大。
- Abstract:
- A typical sustained ozone pollution occurred in Shuangliu, Chengdu from August 22-29, 2019. To explore the cause and mechanisms of ozone pollution, comprehensive observations of ozone and its precursors were conducted in Shuangliu Xihangang Port, Chengdu. An observation-based model was used to resolve the sensitivity and formation and transmission of local ozone, and a positive matrix factor decomposition(PMF)model was used to analyze the source of volatile organic compounds(VOCs)components and identify important VOCs species. The results show that the pollution event was mainly the result of strong local photochemical generation under favorable meteorological conditions. Meteorological conditions during the pollution period were more favorable for ozone generation than on excellent days: higher temperature, stronger solar radiation, lower relative humidity and wind speed, wind direction between 180° and 270°, higher precursor concentrations, and total daily average VOCs concentration of 227×10-9; stronger local ozone generation capacity, with a maximum daytime generation rate of 78.2×10-9/h and the frequency of quiet winds is greater at night, making it easier to accumulate precursors; local ozone generation is mainly controlled by VOCs, and olefins have a significant and most sensitive effect on ozone generation, among which the contribution of ethylene to the ozone generation potential is 52.6%; motor vehicle emission sources(add combustion sources)are the primary source of VOCs and have a larger contribution before pollution occurs.
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备注/Memo
收稿日期:2022-02-21
基金项目:国家重点研发计划资助项目(2018YFC0214002); 四川省重大科技专项资助项目(2018SZDZX0023); 中国气象科学研究院科技发展基金资助项目(2021KJ028)