Vertical distribution of volatile organic compounds within the lower troposphere in late spring of Shanghai
Vertical distribution of volatile organic compounds within the lower troposphere in late spring of Shanghai
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DOI：
10.1016/j.atmosenv.2018.03.044
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发表时间：
2018-08
影响因子：
5
通讯作者：
Kun Zhang;G. Xiu;Lei Zhou;Qinggen Bian;Yusen Duan;Dongnian Fei;Dongfang Wang;Q. Fu
中科院分区：
文献类型：
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作者：
Kun Zhang;G. Xiu;Lei Zhou;Qinggen Bian;Yusen Duan;Dongnian Fei;Dongfang Wang;Q. Fu
大气污染已经成为中国最棘手的环境问题之一，传统的环境监测主要关注污染物的水平分布，而了解污染物的垂直分布曲线仍然非常重要。本研究首次在中国特大城市上海郊区，利用系绳气球测量了对流层下层1000 m范围内臭氧及其前体挥发性有机化合物（VOCs）的垂直分布。分析了50-350、350-700和700-1000 m三个高度的臭氧浓度和臭氧形成势（OFP）。根据我们的测量，VOC的总浓度随着海拔的升高而降低。在50 ~ 350、350 ~ 700和700 ~ 1000 m高度，OFP的优势种分别为烯烃、芳烃和烯烃。研究结果表明，早晨的新鲜排放对近地高浓度苯和甲苯有很大贡献。此外，回归分析表明，对流层中甲苯的下降速度快于苯。VOC浓度可作为对流层下层化学反应数值模拟的初始值。
Air pollution has become one of the most stubborn environmental problem in China, the traditional environmental monitoring mainly focus on the horizontal distribution of the pollutants, while it is still of great importance to have the knowledge of the vertical profiles of them. The present study, for the first time, attempted to acquire the vertical distributions of O3and one of its precursors, volatile organic compounds (VOCs) within 1000 m of lower troposphere by using a tethered balloon in the suburban of Shanghai, a Chinese megacity. We analyze the concentration and the ozone formation potential (OFP) at three height level of 50–350, 350–700, and 700–1000 m. According to our measurement, the total concentration of VOC decreased with the altitude increasing. In addition, the dominant species of OFP was alkene, aromatics, and alkene at height level of 50–350, 350–700 and 700–1000 m, respectively. Our results suggest that, in the morning, the fresh emission contributed a lot to the high concentration of benzene and toluene near ground. Furthermore, the regression analyzes showed toluene decreased faster than benzene in the troposphere. The VOC concentration can be used as initial values for numerical simulations of chemical reaction in the lower troposphere.