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KMID : 1024520070160010001
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Journal of the Environmental Sciences
2007 Volume.16 No. 1 p.1 ~ p.8
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Atmospheric Photochemistry in Low-and High-NOx Regimes
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Kim Do-Yong
Soda Satoshi
Kendo Akira
Oh Jai-Ho
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Abstract
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Atmospheric photochemistry of were considered theoretically, to clarify the reasons for the different trends of between the formation of photochemical oxidants (Ox) and its primary pollutants for the Low-and High-NOx regimes. Equations of OH, , and production of ozone () as a function of nitrogen oxides (NOx) and reactive hydrocarbons (RH) were represented in this study. For the Low-NOx regime, radical is proportional to RH but independent of NOx. OH radical is proportional to NOx but inversely-proportional to RH. production is proportional to NOx but has a weak dependence on RH. For the High-NOx regime, OH and radicals concentrations and production are proportional to RH but inversely-proportional to NOx. In addition, the Osaka Bay and surrounding areas of Japan were evaluated with the mass balance of odd-hydrogen radicals (Odd-H) using CBM-IV photochemical mechanism, in order to distinguish the Low- and High-NOx regimes. The Harima area (emission ratio, RH/NOx = 6.1) was classified to the Low-NOx regime. The Hanshin area (RH/NOx = 3.5) and Osaka area (RH/NOx = 4.3) were classified to the High-NOx regime.
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KEYWORD
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Photochemical oxidants (Ox), Nitrogen oxides (NOx), Reactive hydrocarbons (RH), Low-NOx regime, High-NOx regime
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