Diurnal variation of OH radical and hydrocarbons in a polluted air mass during long-range transport in central Japan |
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| Institution: | 1. College of Chemistry and Chemical Engineer, Xinjiang University, Urumqi 830046, China;2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China;3. Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China;4. College of Geosciences and Survey Engineering, China University of Mining and Technology, Beijing 100083, China;1. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China;2. Resource and Environmental Branch, China National Institute of Standardization, Haidian District, Beijing 100191, China;3. Beijing Yanshan Earth Critical Zone National Research Station, Chinese Academy of Sciences, Beijing 101400, China;4. National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing 101400, China;1. Key Laboratory of Coal Clean Conversion and Chemical Engineering Process, Xinjiang Uyghur Autonomous Region, Xinjiang University, Urumqi 830046, China;2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry Chinese Academy of Sciences, Guangzhou 510640, China;3. Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou 510640, China |
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| Abstract: | Long-range transport (LRT) of photochemical air pollution from the coastal area, with large emission sources to the inland mountainous region, occurs frequently in central Japan on clear summer days. Hydrocarbons and other pollutants were measured together with meteorological parameters along this route, and the diurnal variations of OH radical and hydrocarbons in the polluted air mass were investigated in relation with these photochemical reactions.At inland sampling sites, hydrocarbon concentrations in a polluted air mass decreased during LRT in the daytime. In particular, olefins were destroyed significantly because of more active photochemical reactions. From these destruction rates and/or O3 formation rates the OH radical concentration was estimated and found to increase from 0.5 × 10?7 in the morning to a maximum of 8.0 × 10?7 ppm at midday. These values, as well as the diurnal variation, compared well with the numerical result of the comprehensive transport/reaction/removal model (Chang et al., 1989, Atmospheric Environment23, 363–393, 1749–1773). The contribution of each hydrocarbon component to the total hydrocarbon destruction was also discussed. |
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