基于无人机的深圳近地层大气VOCs垂直分布监测  

Vertical distribution monitoring of near-surface atmospheric VOCs in Shenzhen based on UAV-borne

作　　者：王碧璇 程勇 于广河 李歆 王海潮 郑泽龙 曾立武 黄晓锋 WANG Bi-xuan;CHENG Yong;YU Guang-he;LI Xin;WANG Hai-chao;ZHENG Ze-long;ZENG Li-wu;HUANG Xiao-feng(Laboratory of Atmospheric Observation Supersite,School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China;PKU~HKUST Shenzhen-Hong Kong Institution,Shenzhen 518057,China;Guangdong Laboratory of Southern Marine Science and Engineering,School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai 519082,China)

机构地区：[1]北京大学深圳研究生院环境与能源学院,大气观测超级站实验室,广东深圳518055 [2]深港产学研基地(北京大学香港科技大学深圳研修院),广东深圳518057 [3]中山大学大气科学学院,南方海洋科学与工程广东省实验室(珠海),广东珠海519082

出　　处：《中国环境科学》2024年第6期3021-3029,共9页China Environmental Science

基　　金：深圳市科技计划项目(KCXFZ202002011006340)。

摘　　要：2023年9月21~23日,基于无人机多通道全空气采样系统及搭载的NO_(2)和O_(3)集成监测装置在深圳进行了7个梯度的早间和午间两个时段监测,以探究0~480m高度的VOCs垂直分布特征、组成演变规律及其对O3形成影响.结果表明,VOCs浓度在早间时段随高度升高波动下降,体现出地面排放的显著影响;而在午间时段随高度升高而波动上升,此时受到区域传输的显著影响.VOCs中主要物种为OVOCs和烷烃,两者浓度在垂直梯度上均受排放源影响显著,在160~240m以及400m处呈现峰值,而其他物种浓度在垂直梯度上仅略有波动.总O3生成潜势(OFP)垂直分布特征与总VOCs浓度一致,OFP中贡献占比较大的为OVOCs(36.9%)、烯烃(25.2%)和芳香烃(22.4%).典型物种和特征物种比值分析表明,二次生成､工业过程和溶剂使用源以及机动车排放对VOCs垂直分布特征有显著影响.此外,观测期间NO_(2)浓度于两个时段都在240m以上随高度升高而升高,O_(3)浓度于早间时段在160m处出现峰值,午间时段在240m以上呈现与NO2相反的变化趋势,受到了VOCs和NO_(2)的协同作用影响.From September 21 to 23,2023,a study was conducted in Shenzhen using a multi-channel airborne sampling system on unmanned aerial vehicle(UAV)equipped with in-house NO_(2) and O_(3) integrated monitoring devices in seven gradient levels during morning and afternoon periods.This study aimed to investigate the vertical distribution characteristics,composition evolution,and their impact on ozone formation of volatile organic compounds(VOCs)from the surface to 480 meters.The results indicated that the concentrations of VOCs in the morning decreased with height,reflecting a significant influence of ground emissions,while it increased with height in the afternoon,influencing by regional transport.The main VOC species were OVOCs and alkanes,with their concentrations peaking at 160~240meters and 400meters due to emission sources,while other species exhibited minor fluctuations.The vertical distribution characteristics of the total ozone formation potential(OFP)were consistent with the total VOCs concentration.The major contributors to OFP were OVOCs(36.9%),olefins(25.2%),and aromatics(22.4%).Ratio analysis of typical and characteristic species suggested that secondary production,industrial processes,solvent usage sources,and vehicular emissions have a significant impact on the vertical distribution of VOCs.Furthermore,during the observation period,the NO_(2) concentration increased with altitude above 240 meters in morning and noon.The O_(3) concentration peaked at 160 meters during the morning,and showed an opposite trend to NO_(2) above 240 meters during the afternoon,influenced by the synergistic effects of VOCs and NO_(2).

关 键 词：挥发性有机物 O3 垂直分布 无人机监测 

分 类 号：X511[环境科学与工程—环境工程]