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Atmospheric Photochemistry in Low-and High-NOx Regimes
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 Title & Authors
Atmospheric Photochemistry in Low-and High-NOx Regimes
Kim, Do-Yong; Soda, Satoshi; Kendo, Akira; Oh, Jai-Ho;
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 Abstract
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.
 Keywords
Photochemical oxidants (Ox);Nitrogen oxides (NOx);Reactive hydrocarbons (RH);Low-NOx regime;High-NOx regime;
 Language
English
 Cited by
1.
A Case Study on Emission Management for Reducing Photochemical Pollution over the Osaka Bay Area,;;;;

Asia-Pacific Journal of Atmospheric Sciences, 2008. vol.44. 4, pp.341-349
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