| 武汉城市快速路区域空气PM2.5中碳质组分的季节变化 |
| Seasonal Variation Characteristics of Carbonaceous Fraction in PM2.5 of Urban Expressways Area in Wuhan City |
| 投稿时间：2023-07-21 修订日期：2024-08-13 |
| DOI：10.19316/j.issn.1002-6002.2025.01.11 |
| 中文关键词: 城市快速路 机动车 有机碳(OC) 元素碳(EC) 二次有机碳(SOC) |
| 英文关键词:urban expressway motor vehicle organic carbon (OC) elemental carbon (EC) secondary organic carbon (SOC) |
| 基金项目:武汉市细颗粒物和臭氧污染协同防控“一市一策”驻点跟踪研究项目(HBT-16222022-222668) |
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| 通讯作者:陈楠* 湖北省生态环境监测中心站, 湖北 武汉 430072 |
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| 中文摘要: |
| 当前,机动车排放已成为影响城市环境空气质量的重要因素,机动车排放控制受到广泛关注。依据武汉市三环线城市快速路细颗粒物(PM2.5)、臭氧(O3)、有机碳(Organic Carbon,OC)、元素碳(Elemental Carbon,EC)浓度和交通流量等数据,借助EC示踪法和反向传播(BP)神经网络,开展了三环线空气PM2.5中碳质组分的四季变化特征研究。研究发现,季节性气象因素和机动车排放使OC和EC浓度具有明显的时间变化特征。春、秋、冬季PM2.5中,OC和EC之间呈现出极强的正相关性;一次有机碳(Primary Organic Carbon,POC)浓度明显大于夏季,且其主要来源于机动车尾气排放。夏季PM2.5中,二次有机碳(Secondary Organic Carbon,SOC)浓度大于POC浓度,二次生成为OC的主要来源。POC与SOC浓度随机动车总流量的变化而变化。SOC浓度峰值的季节变化特征明显,在夏季出现于昼间,在冬季则出现于夜间,并且夏季的SOC与OC浓度比值(SOC/OC=0.46)大于其他季节(0.29~0.41)。同时,SOC/OC值与机动车流量之间呈现非线性关系。除冬季外,其他季节的SOC/OC值随机动车流量的增加呈现出先增大后下降的变化趋势。 |
| 英文摘要: |
| Currently,vehicle emissions have emerged as a crucial factor influencing urban ambient air quality,and the control of vehicle emissions has received extensive attention. Based on the data on PM2.5, O3, Organic Carbon (OC), Elemental Carbon (EC),and traffic flow from Wuhan's Third Ring Road urban expressway,this study employed the EC tracer method and Back Propagation (BP) neural network to investigate the seasonal variations in carbonaceous components within the PM2.5 of the Third Ring Road. The research revealed that both seasonal meteorological conditions and motor vehicle emissions induce pronounced temporal fluctuations in OC and EC concentrations. In spring, autumn, and winter, a strong positive correlation was observed between OC and EC in PM2.5, with primary organic carbon (POC) concentrations significantly higher during these seasons compared to summer. The POC is predominantly derived from motor vehicle exhaust emissions. Conversely,during the summer,the concentration of secondary organic carbon (SOC) exceeded that of POC, with secondary formation becoming the predominant source of OC. The concentrations of POC and SOC fluctuated in tandem with the total volume of motor vehicle traffic,with SOC concentrations exhibiting particularly marked variations. SOC concentrations were observed during daytime in summer and nighttime in winter,resulting in a SOC/OC concentration ratio of 0. 46 during summer,which was notably higher than in other seasons (ranging from 0. 29 to 0. 41). Additionally,a non-linear relationship was discerned between SOC/OC values and motor vehicle traffic,with the exception of winter,where SOC/OC values generally increased with the rise in motor vehicle flow,except for a trend of initially increasing and then decreasing in other seasons. |
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