Upward trend and formation of surface ozone in the Guanzhong Basin, Northwest China
Upward trend and formation of surface ozone in the Guanzhong Basin, Northwest China
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关中盆地地表臭氧上升趋势及形成
DOI：
10.1016/j.jhazmat.2021.128175
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发表时间：
2022
影响因子：
13.6
通讯作者：
Junji Cao
中科院分区：
文献类型：
--
作者：
Yonggang Xue;Liqin Wang;Suixin Liu;Yu Huang;Long Chen;Long Cui;Junji Cao
2014 ~ 2020年，关中盆地表层臭氧（O3）呈增加趋势，最大日平均8 h (MDA8) O3浓度的增长率为3.9 ~ 6.4 μ m−3yr−1。为了进一步了解O3的形成，2018年夏季开展了挥发性有机化合物（VOCs）调查。在居民区和工业化城市均观察到高水平的挥发性有机化合物。高峰时段非甲烷烃（NMHCs）浓度升高，表明交通活动对环境VOCs的负荷起主导作用。夜间NMHCs和OVOCs均升高，且VOCs峰值与O3的积累同步。风场分析表明，横越横越东部偏远林区和工业区的北上西进气团是造成横越东部环境VOCs升高的主要原因。交通排放、燃料蒸发和溶剂使用是环境NMHCs的主要来源，而溶剂使用和二次形成是OVOCs的主要负荷。研究结果表明，广东地区对典型污染源VOCs的就地治理和区域协同治理迫在眉睫。
Increase trend of surface ozone (O3) was observed in the Guanzhong Basin (GZB) from 2014 to 2020 with growth rates of 3.9–6.4 μg m−3yr−1for the maximum daily average 8 h (MDA8) O3concentrations. To further understand the formation of O3, investigation of volatile organic compounds (VOCs) was carried out in the summer of 2018. High levels of VOCs were observed in both residential area and industrialized cities. Elevated concentrations of none-methane Hydrocarbon (NMHCs) were observed in rush hours, which indicated dominated roles of traffic activities on the loading of ambient VOCs. In the nighttime, both of NMHCs and oxygenated VOCs (OVOCs) were raised, and the peaks of VOCs kept pace with accumulation of O3. Wind field indicated that northward and westward air mass, which passed through the remote forest and industrial area in east of the GZB, was responsible to elevated ambient VOCs in the GZB. Traffic emission, fuel evaporation, and solvent using were key contributors to ambient NMHCs, while solvent using and secondary formation dominated the loading of OVOCs. The present study indicated that both local management and regional collaborative control on active VOCs species from typical sources is urgently needed in GZB.