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Title: Surface O₃ photochemistry over the South China Sea : application of a near-explicit chemical mechanism box model
Authors: Wang, Y 
Guo, H 
Zou, S
Lyu, X 
Ling, Z
Cheng, H
Zeren, Y 
Issue Date: Mar-2018
Source: Environmental pollution, Mar. 2018, v. 234, p. 155-166
Abstract: A systematic field measurement was conducted at an island site (Wanshan Island, WSI) over the South China Sea (SCS) in autumn 2013. It was observed that mixing ratios of O₃ and its precursors (such as volatile organic compounds (VOCs), nitrogen oxides (NOx = NO + NO2) and carbon monoxide (CO)) showed significant differences on non-episode days and episode days. Additional knowledge was gained when a photochemical box model incorporating the Master Chemical Mechanism (PBM-MCM) was applied to further investigate the differences/similarities of O₃ photochemistry between non-episode and episode days, in terms of O₃-precursor relationship, atmospheric photochemical reactivity and O₃ production. The simulation results revealed that, from non-O₃ episode days to episode days, 1) O₃ production changed from both VOC and NOx-limited (transition regime) to VOC-limited; 2) OH radicals increased and photochemical reaction cycling processes accelerated; and 3) both O₃ production and destruction rates increased significantly, resulting in an elevated net O₃ production over the SCS. The findings indicate the complexity of O₃ pollution over the SCS. Elevation of maritime O₃ and its precursors was attributable to the transport of polluted continental air, implying impact of human activities on atmospheric composition above the SCS.
Keywords: Ozone
Photochemical box model
Photochemistry
South China Sea
VOCs
Publisher: Elsevier Ltd
Journal: Environmental pollution 
ISSN: 0269-7491
EISSN: 1873-6424
DOI: 10.1016/j.envpol.2017.11.001
Rights: © 2017 Elsevier B.V. All rights reserved.
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The following publication Wang, Y., Guo, H., Zou, S., Lyu, X., Ling, Z., Cheng, H., & Zeren, Y. (2018). Surface O3 photochemistry over the South China Sea: Application of a near-explicit chemical mechanism box model. Environmental Pollution, 234, 155-166 is available at https://doi.org/10.1016/j.envpol.2017.11.001.
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