| Numerical Study on the Impacts of Heterogeneous Reactions on Ozone Formation in the Beijing Urban Area |
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| 作者姓名： | 徐峻 张远航 王玮 |
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| 作者单位： | [1]College of Environmental Sciences, Peking University, Beijing 100871 [2]Chinese Research Academy of Environmental Sciences, Beijing 100012 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，中央级科研院所技术开发研究专项基金 |
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| 摘 要： | The air quality model CMAQ-MADRID （Community Multiscale Air Quality-Model of Aerosol Dynamics, Reaction, Ionization and Dissolution） was employed to simulate summer O3 formation in Beijing China, in order to explore the impacts of four heterogeneous reactions on O3 formation in an urban area. The results showed that the impacts were obvious and exhibited the characteristics of a typical response of a VOC-limited regime in the urban area. For the four heterogeneous reactions considered, the NO2 and HO2 heterogeneous reactions have the most severe impacts on O3 formation. During the O3 formation period, the NO2 heterogeneous reaction increased new radical creation by 30%, raising the atmospheric activity as more NO→NO2 conversion occurred, thus causing the O3 to rise. The increase of O3 peak concentration reached a maximum value of 67 ppb in the urban area. In the morning hours, high NO titration reduced the effect of the photolysis of HONO, which was produced heterogeneously at night in the surface layer. The NO2 heterogeneous reaction in the daytime is likely one of the major reasons causing the O3 increase in the Beijing urban area. The HO2 heterogeneous reaction accelerated radical termination, resulting in a decrease of the radical concentration by 44% at the most. O3 peak concentration decreased by a maximum amount of 24 ppb in the urban area. The simulation results were improved when the heterogeneous reactions were included, with the O3 and HONO model results close to the observations.
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| 关 键 词： | 臭氧 空气质量模型 数值模拟 北京 |
| 收稿时间： | 2005-10-27 |
| 修稿时间： | 2005-12-30 |
Numerical study on the impacts of heterogeneous reactions on ozone formation in the Beijing urban area |
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| Jun Xu,Yuanhang Zhang,Wei Wang.Numerical Study on the Impacts of Heterogeneous Reactions on Ozone Formation in the Beijing Urban Area[J].Advances in Atmospheric Sciences,2006,23(4):605-614. |
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| Authors: | Jun Xu Yuanhang Zhang Wei Wang |
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| Institution: | College of Environmental Sciences, Peking University, Beijing 100871, Chinese Research Academy of Environmental Sciences, Beijing 100012,College of Environmental Sciences, Peking University, Beijing 100871,Chinese Research Academy of Environmental Sciences, Beijing 100012 |
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| Abstract: | The air quality model CMAQ-MADRID (Community Multiscale Air Quality-Model of Aerosol Dynamics, Reaction, Ionization and Dissolution) was employed to simulate summer O3 formation in Beijing China, in order to explore the impacts of four heterogeneous reactions on O3 formation in an urban area.The results showed that the impacts were obvious and exhibited the characteristics of a typical response of a VOC-limited regime in the urban area. For the four heterogeneous reactions considered, the NO2 and HO2 heterogeneous reactions have the most severe impacts on O3 formation. During the O3 formation period, the NO2 heterogeneous reaction increased new radical creation by 30%, raising the atmospheric activity as more NO→NO2 conversion occurred, thus causing the O3 to rise. The increase of O3 peak concentration reached a maximum value of 67 ppb in the urban area. In the morning hours, high NO titration reduced the effect of the photolysis of HONO, which was produced heterogeneously at night in the surface layer. The NO2 heterogeneous reaction in the daytime is likely one of the major reasons causing the O3 increase in the Beijing urban area. The HO2 heterogeneous reaction accelerated radical termination,resulting in a decrease of the radical concentration by 44% at the most. O3 peak concentration decreased by a maximum amount of 24 ppb in the urban area. The simulation results were improved when the heterogeneous reactions were included, with the O3 and HONO model results close to the observations. |
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| Keywords: | heterogeneous reactions ozone air quality model impacts urban area |
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