Impacts of Global Emissions of CO, NOx, and CH4 on
China Tropospheric Hydroxyl Free Radicals |
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Authors: | SU Mingfeng LIN Yunping FAN Xinqiang PENG Li and ZHAO Chunsheng |
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Institution: | Xiamen Meteorological Bureau, Xiamen 361012,
Nansen-Zhu International Research Center, Institute of Atmospheric Physics,
Chinese Academy of Sciences, Beijing 100029 |
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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
(NOx), and methane (CH4) 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 (HO2) 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
NOx on OH is partly offset by the contrary effect of increased CO and
CH4 emissions: the double emissions of NOx will cause an increase
of OH of 18.1%--30.1%, while the increases of CO and CH4 will
cause a decrease of OH of 12.2%--20.8% and 0.3%--3.0%,
respectively. In turn, the lifetimes of CH4, CO, and NOx will
increase by 0.3%--3.1% with regard to double emissions of CH4,
13.9%--26.3% to double emissions of CO and decrease by
15.3%--23.2% to double emissions of NOx. |
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Keywords: | impact tropospheric OH emissions MOZART |
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