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- Title
Impacts of global emissions of CO, NO, and CH on China tropospheric hydroxyl free radicals.
- Authors
Su, Mingfeng; Lin, Yunping; Fan, Xinqiang; Peng, Li; Zhao, Chunsheng
- Abstract
Using the global chemistry and transport model MOZART, the simulated distributions of tropospheric hydroxyl free radicals (OH) over China and its sensitivities to global emissions of carbon monoxide (CO), nitrogen oxide (NO), and methane (CH) were investigated in this study. Due to various distributions of OH sources and sinks, the concentrations of tropospheric OH in east China are much greater than in west China. The contribution of NO + perhydroxyl radical (HO) reaction to OH production in east China is more pronounced than that in west China, and because of the higher reaction activity of non-methane volatile organic compounds (NMVOCs), the contributions to OH loss by NMVOCs exceed those of CO and take the dominant position in summer. The results of the sensitivity runs show a significant increase of tropospheric OH in east China from 1990 to 2000, and the trend continues. The positive effect of double emissions of NO on OH is partly offset by the contrary effect of increased CO and CH emissions: the double emissions of NO will cause an increase of OH of 18.1%-30.1%, while the increases of CO and CH will cause a decrease of OH of 12.2%-20.8% and 0.3%-3.0%, respectively. In turn, the lifetimes of CH, CO, and NO will increase by 0.3%-3.1% with regard to double emissions of CH, 13.9%-26.3% to double emissions of CO and decrease by 15.3%-23.2% to double emissions of NO.
- Subjects
EAST China Sea; EMISSIONS (Air pollution); CARBON monoxide; FREE radicals; SIMULATION methods &; models; NITRIC oxide; METHANE
- Publication
Advances in Atmospheric Sciences, 2012, Vol 29, Issue 4, p838
- ISSN
0256-1530
- Publication type
Article
- DOI
10.1007/s00376-012-1229-2