Vertical distributions of VOCs in the Tibetan Plateau background region  

作　　者：Xuanxuan Xue Fugeng Zha Yinghong Wang Yang Zhang Yu Wang Ying Shen Yanyu Kang Dan Yao Guiqian Tang Jianchun Bian Yuesi Wang 

机构地区：[1]School of Earth and Environment,Anhui University of Science and Technology,Huainan,China [2]Key Laboratory of Atmospheric Environment and Extreme Meteorology,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [3]Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [4]College of Environment,Henan Normal University,Xinxiang,China [5]University of Chinese Academy of Sciences,Beijing,China

出　　处：《Atmospheric and Oceanic Science Letters》2024年第6期33-38,共6页大气和海洋科学快报（英文版）

基　　金：supported by the second Tibetan Plateau Scientific Expedition and Research Program[No.2019QZKK0604];the National Natural Science Foundation of China[Nos.42177081 and 42171450];the Youth Cross Team Scientific Research Project of the Chinese Academy of Sciences[No.JCTD-2021–10]。

摘　　要：Exploring the vertical variation in volatile organic compounds(VOCs)in background regions can provide infor-mation on the spatial distribution of pollutants,providing a scientific basis for atmospheric pollution prevention and control strategies.From 15 August to 5 September 2023,at the Southeast Tibet Mountain Comprehensive Environmental Observation Station(SETS),a tethered balloon was used to sample VOCs every 100 m from the ground to 1000 m.A total of 403 air bag samples were collected,and 39 vertical profiles of VOCs were obtained.Ninety-two VOC species were detected.The VOC concentration at the SETS did not change significantly verti-cally,and the average VOC concentration was 11.1±2.4 ppbv.The main components were alkanes(51.4%),alkenes(18.7%),and halohydrocarbons(18.1%).There was no obvious diurnal change in VOCs and no signif-icant difference between the different layers.When the surface VOC concentration was less than 10 ppbv,the concentrations,components,and sources of VOCs were evenly distributed vertically,and the main sources of VOCs at different heights were vehicle exhaust and background.When the surface VOC concentration exceeded 10 ppbv,the VOC concentration gradually decreased with height.The proportion of alkanes in surface VOCs in-creased,and the source was mainly vehicle exhaust.This study confirmed that VOCs are vertically homogeneous in the background of the Tibetan Plateau,emphasizing the importance of vehicle emissions as a potential source of VOCs.研究背景区域挥发性有机物(VOCs)的垂直变化规律,可以提供污染物的空间分布信息,为制定大气污染防治策略提供科学依据.2023年夏季,利用系留气艇对藏东南背景区域VOCs垂直分布规律进行研究,共获取92种VOC的39条垂直廓线.结果表明,VOC浓度垂直分布均一,平均浓度为11.1±2.4 ppbv;主要成分为烷烃(51.4%),烯烃(18.7%)和卤代烃(18.1%).地表VOC浓度小于10 ppbv时,不同高度VOCs的主要来源为机动车尾气和背景贡献.而地表VOC浓度超过10 ppbv时,烷烃占比增加,来源以机动车尾气为主.该研究证实了青藏高原VOC在垂直方向上分布均一,强调了机动车排放作为VOCs潜在来源的重要性.

关 键 词：VOCS Vertical distributions Boundary layer Source apportionment 

分 类 号：X51[环境科学与工程—环境工程]