Surface O3 photochemistry over the South China Sea: Application of a near-explicit chemical mechanism box model.
Surface O3 photochemistry over the South China Sea: Application of a near-explicit chemical mechanism box model.
复制标题
DOI：
10.1016/j.envpol.2017.11.001
复制
发表时间：
2018-03
影响因子：
8.9
通讯作者：
Yu Wang;Hai Guo;S. Zou;X. Lyu;Z. Ling;Hairong Cheng;Yangzong Zeren
中科院分区：
文献类型：
--
作者：
Yu Wang;Hai Guo;S. Zou;X. Lyu;Z. Ling;Hairong Cheng;Yangzong Zeren
2013年秋季，对南海某岛（万山岛，WSI）进行了系统的现场测量，观察到O3及其前体物（如挥发性有机化合物（VOCs）、氮氧化物（NOx=NO+NO2）和一氧化碳（CO））的混合比例在非发作日和发作日表现出显着差异。当应用包含主化学机制 (PBM-MCM) 的光化学盒模型进一步研究非发作日和发作日之间 O3 光化学在 O3-前体关系、大气光化学反应性和 O3 产生方面的差异/相似性时，获得了额外的知识。模拟结果表明，从非O3事件日到O3事件日，1）O3产量从VOC和NOx限制（过渡状态）变为VOC限制； 2) OH自由基增多，光化学反应循环过程加速； 3) O3 产量和破坏率均显着增加，导致南海净 O3 产量增加。研究结果表明南海臭氧污染的复杂性。
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 O3and 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 O3photochemistry between non-episode and episode days, in terms of O3-precursor relationship, atmospheric photochemical reactivity and O3production. The simulation results revealed that, from non-O3episode days to episode days, 1) O3production 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 O3production and destruction rates increased significantly, resulting in an elevated net O3production over the SCS. The findings indicate the complexity of O3pollution over the SCS.