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南京北郊工业乡村混合区秋季边界层VOCs垂直分布特征
摘要点击 1721  全文点击 1631  投稿时间:2022-02-19  修订日期:2022-04-15
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中文关键词  南京|挥发性有机化合物(VOCs)|垂直分布|光化学反应性|源识别
英文关键词  Nanjing|volatile organic compounds(VOCs)|vertical distribution|photochemical reactivity|source identification
作者单位E-mail
王泰 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
气象灾害教育部重点实验室, 南京 210044
国家综合气象观测专项试验外场, 南京 210044 
448488219@qq.com 
朱彬 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
气象灾害教育部重点实验室, 南京 210044
国家综合气象观测专项试验外场, 南京 210044 
binzhu@nuist.edu.cn 
施双双 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
气象灾害教育部重点实验室, 南京 210044
国家综合气象观测专项试验外场, 南京 210044 
 
安俊琳 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
气象灾害教育部重点实验室, 南京 210044
国家综合气象观测专项试验外场, 南京 210044 
 
唐贵谦 中国科学院大气物理研究所大气边界层物理与大气化学国家重点实验室(LAPC), 北京 100029  
徐家平 江苏省气候中心, 南京 210009  
中文摘要
      利用2020年秋季南京北郊低对流层(0~1000 m) VOCs探空实验数据,分析了该地区VOCs垂直廓线分布及其日变化、光化学反应性等特征.结果表明,φ(VOCs)随高度升高而降低(72.1×10-9±28.1×10-9~56.4×10-9±24.8×10-9).各高度上烷烃占比最大(68%~75%),其次为芳香烃(10%~12%)、卤代烃(10%~11%)、烯烃(3%~7%)和乙炔(2%).边界层日变化对VOCs廓线影响较大,早晚较低的边界层致使VOCs在近地面累积,而在上部体积分数较低;午后VOCs的垂直分布则较均匀.上午光化学反应性强(弱)的烯烃(烷烃)等的体积分数占比随高度升高而减小(增加),说明高层的VOCs光化学老化显著.午后VOCs各组分占比及其OFP在低对流层内垂直分布则较均匀.受周边不同来源气团影响,各高度φ(VOCs)及组分占比差异明显,工业气团在200~400 m;高度间φ(VOCs)随高度升高,芳香烃占比增大;城区气团φ(VOCs)垂直负梯度最大,近地面φ(VOCs)较高,芳香烃较丰富;乡村气团的烷烃垂直分布均匀且占比随高度逐渐升高;公路交通气团的近地面φ(VOCs)较高,烷烃占比最大.
英文摘要
      Based on the sounding data of VOCs in the lower troposphere (0-1000 m) in the northern suburb of Nanjing in the autumn of 2020, the vertical profile distribution, diurnal variation, and photochemical reactivity of VOCs in this area were analyzed. The results showed that the volume fraction of VOCs decreased with the increase in height (72.1×10-9±28.1×10-9-56.4×10-9±24.8×10-9). Alkanes at all heights accounted for the largest proportion (68%-75%), followed by aromatics (10%-12%), halohydrocarbons (10%-11%), alkenes (3%-7%), and acetylene (2%). The diurnal variation of the boundary layer had a great influence on the VOCs profile. The lower boundary layer in the morning and evening caused the volume fraction of VOCs to accumulate near the ground and lower in the upper layer. The vertical distribution of VOCs was more uniform in the afternoon. In the morning, the volume fraction proportion of alkenes (alkanes) with strong (weak) photochemical reactivity decreased (increased) with the increase in height, indicating that the photochemical aging of VOCs in the upper layer was significant. In the afternoon, the vertical distribution of VOCs volume fraction and OFP in the lower troposphere were more uniform. Affected by the surrounding air masses with different sources, the volume fraction and component proportion of VOCs at each height were significantly different. The alkanes in rural air masses were vertically evenly distributed, and the proportion increased gradually with the height. The vertical negative gradient of VOCs volume fraction in the urban air mass was the largest, the volume fraction of VOCs near the ground was high, and it was rich in aromatics. The proportion of aromatics increased with the increase in VOCs volume fraction between 200-400 m height of industrial air mass. The near-surface VOCs volume fraction of the highway traffic air mass was high, and alkanes accounted for the largest proportion.

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