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Oxidative Capacity and Radical Chemistry in a Semi-arid and Petrochemical-industrialized City, Northwest China

Category: Aerosol and Atmospheric Chemistry

Accepted Manuscripts
DOI: 10.4209/aaqr.2017.11.0506
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Chenhui Jia1, Yanan Wang2, Yaojie Li1, Tao Huang1, Xiaoxuan Mao1, Jingyue Mo3, Jixiang Li3, Wanyanhan Jiang1, Xiaoxue Liang1, Hong Gao1, Jianmin Ma 1,4

  • 1 Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
  • 2 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
  • 3 College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China
  • 4 Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China


OH initiation was dominated by the photolysis of O3 and HONO in downtown.
Reaction of O3 with VOCs was important to OH in petrochemical industrial suburb.
The predominant oxidant was OH in daytime and NO3 in nighttime.


Located in semi-arid and mountainous northwestern China, heavy ozone (O3) pollution was often observed in chemical industrialized Lanzhou and other capital cities in northwest provinces. There are large knowledge gaps between radical budgets and photochemistry in these cities. To gain insights into the understanding of potential connections between photochemistry and radical budgets, a photochemical box model based on the Master Chemical Mechanism (MCM v3.3) was applied to investigate oxidative capacity and radical chemistry in Lanzhou City. The budgets of ROx (OH + HO2 + RO2) radicals were quantified, and the initiation, propagation, and termination process in the diurnal variation of ozone chemistry were examined.


ROx radical Source Oxidative capacity Lanzhou MCM model

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