典型工业城市长治市夏季大气挥发性有机物来源及对臭氧生成贡献

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摘要以典型工业型城市长治市为研究对象,采用正定矩阵因子分解法(PMF)对挥发性有机物(VOCs)进行来源解析,基于大气盒子模型(AtChem-MCM)对大气光化学反应过程和臭氧(O₃)生成敏感性进行了分析.结果表明,长治市烷烃、烯烃、炔烃和芳香烃分别占总挥发性有机物(TVOC)浓度的57.49%、16.05%、9.17%和17.29%.PMF结果显示,机动车源对VOCs浓度的贡献最高(28.45%),其次为工业源(26.19%)、燃烧源(21.09%)、植物源(12.99%)和溶剂使用源(11.28%).O₃生成模拟结果显示日间O₃平均净生成速率为23.01×10^-9h^-1,11时O₃净生成速率达到峰值(54.32×10^-9h^-1);长治市O₃生成对VOCs和NO_X均敏感,其中烯烃(1.05)和NO_X(0.35)的相对增量反应活性系数(RIR)较高.污染源中工业源(0.072)、溶剂使用源(0.071)和机动车源(0.068)的RIR值相对较高,是对O₃生成贡献较大的污染源.工业型城市应加强控制工业源和机动车源排放以缓解O₃污染.

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关键词 ：挥发性有机物, 源解析, 大气盒子模型, 臭氧, 敏感性分析

Abstract：In this study, taking Changzhi as a typical industrial city, the source apportionment of Volatile Organic Compounds (VOCs) was carried out used positive definite matrix factorization (PMF) model, and the atmospheric photochemical reaction process and O₃ formation sensitivity were analyzed based on an observation-based model (AtChem-MCM). The results showed that the concentrations of alkanes, alkenes, alkynes and aromatics accounted for 57.49%, 16.05%, 9.17% and 17.29% of TVOC in Changzhi, respectively. PMF results showed that vehicle emission was the major source of VOCs (28.45%), followed by industrial process (26.19%), combustion sources (21.09%), biogenic sources (12.99%) and solvent utilization (11.28%). The simulation results of O₃ formation showed that the average net formation rate of O₃ during daytime was 23.01×10^-9h^-1, which reached a peak value (54.32 ×10^-9h^-1) at 11o'clock. The formation of O₃ in Changzhi was sensitive to both VOCs and NO_x, and alkene (1.05) and NO_x (0.35) had the higher relative incremental reaction activity coefficients (RIR). Industrial process (0.072), solvent utilization (0.071) and vehicle emissions (0.068) had the higher RIR value, which were the key sources contributed to O₃ formation. Therefore, industrial process and vehicles emissions should be strengthen for the control of O₃ in industrial cities.

Key words： volatile organic compounds source apportionment atmospheric box model ozone sensitivity analysis

收稿日期: 2024-01-03

PACS:

X511

基金资助:国家自然科学基金项目(42330606,21976053,42103056,42273058);大气重污染成因与治理攻关项目(DQGG202108)

作者简介: 邢怡然(1999-),女,黑龙江哈尔滨人,硕士研究生,主要从事大气挥发性有机物来源及化学反应研究.859674875@qq.com.

引用本文:

邢怡然, 牛月圆, 闫雨龙, 彭林, 董佳奇, 越柯. 典型工业城市长治市夏季大气挥发性有机物来源及对臭氧生成贡献[J]. 中国环境科学, 2024, 44(8): 4202-4210. XING Yi-ran, NIU Yue-yuan, YAN Yu-long, PENG Lin, DONG Jia-qi, YUE Ke. The sources of volatile organic compounds in the summer atmosphere and the contribution to ozone generation in Changzhi, a typical industrial city. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4202-4210.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I8/4202

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