华北平原南部城市疫情管控期间细颗粒物组分特征及有机气溶胶来源解析

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摘要为探究漯河市在新冠疫情期间不同管控阶段细颗粒物组分和有机气溶胶的变化,收集了2022年3月1日~5月31日该市颗粒物化学组分在线监测数据,并且运用正定矩阵因子分解模型(PMF)对有机气溶胶进行来源解析.研究结果表明:观测期间PM_2.5和PM₁₀平均质量浓度分别为45和95 μg/m³.管控中期因管制措施的实施颗粒物浓度有所下降,降幅分别为29%、28%;PM_2.5中各组分质量浓度在管控前、中、后3个时段均呈现先下降再上升的趋势,且在3个时段里有机物贡献均为最高,其次为硝酸盐.利用PMF对漯河观测期间的有机气溶胶质谱数据进行解析,共识别出4类有机气溶胶,分别为:氧化程度较高的有机气溶胶(MO-OOA)、氧化程度较低的有机气溶胶(LO-OOA)、类烃类有机气溶胶(HOA)、烹饪类有机气溶胶(COA),管控期间各有机气溶胶占比均有变化,且在整个观测时段和管控期间二次有机气溶胶贡献均高于一次有机气溶胶.污染物传输方面,3个阶段的传输中主要集中在西部扇区,由于管控措施的实施管控中期传输影响降低.

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	赵荣华
	牛大伟
	张楠
	王辉
	杨文
	吴丽萍
	韩斌

关键词 ：有机气溶胶, PM_2.5, 新冠疫情, 漯河, ACSM

Abstract：To investigate the changes in particulate matter (PM) and organic aerosols at different control stages during the COVID-19 epidemic lockdown in Luohe City, we collected online monitoring data of PM chemical compositions in the study city from 1March to 31 May 2022, and used the positive matrix factorization (PMF) model to analyze the sources of organic aerosols. The results showed that the average mass concentrations of PM_2.5 and PM₁₀ during the observation period were 45 and 95μg/m³, respectively. The mass concentrations of PM_2.5 compositions showed a decreasing and then an increasing trend in the three time periods before, during, and after the lockdown. In all three periods, the contribution of organic matter was the highest, followed by nitrate. The organic aerosol mass spectrometry data during the observation period were analyzed by PMF, and four types of organic aerosols were identified: more oxidized organic aerosol (MO-OOA), less oxidized organic aerosol (LO-OOA), hydrocarbon-like organic aerosol (HOA) and cooking organic aerosol (COA). The contribution of secondary organic aerosols was higher than that of primary organic aerosols throughout the observation and lockdown periods. In terms of pollutant transport, the three phases of transport were mainly concentrated in the western sector, and the impact of transport was reduced during the lockdown due to the implementation of control measures.

Key words： organic aerosol PM_2.5 COVID-19 Luohe ACSM

收稿日期: 2024-01-13

PACS:

X513

基金资助:国家大气污染防治攻关项目(DQGG202137)

作者简介: 赵荣华(2000-),女,山东泰安人,硕士研究生,主要从事大气科学研究.zrhhhh1213@163.com.

引用本文:

赵荣华, 牛大伟, 张楠, 王辉, 杨文, 吴丽萍, 韩斌. 华北平原南部城市疫情管控期间细颗粒物组分特征及有机气溶胶来源解析[J]. 中国环境科学, 2024, 44(8): 4230-4239. ZHAO Rong-hua, NIU DA-wei, ZHANG Nan, WANG Hui, YANG Wen, WU Li-ping, HAN Bin. Characterizations of fine particle compositions and organic aerosol source analysis during the 2022 epidemic lockdown in a city on the southern edge of the North China Plain. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4230-4239.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I8/4230

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