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http://dx.doi.org/10.5322/JES.2007.16.1.001

Atmospheric Photochemistry in Low-and High-NOx Regimes  

Kim, Do-Yong (Center for Atmospheric Sciences & Earthquake Research, korea Meteorological Administration)
Soda, Satoshi (Graduate School of Engineering, Osaka University)
Kendo, Akira (Graduate School of Engineering, Osaka University)
Oh, Jai-Ho (Department of Environmental Atmospheric Sciences, Pukyong National University)
Publication Information
Journal of Environmental Science International / v.16, no.1, 2007 , pp. 1-8 More about this Journal
Abstract
Atmospheric photochemistry of $O_3-NOx-RH$ 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, $HO_2$, and production of ozone ($O_3$) as a function of nitrogen oxides (NOx) and reactive hydrocarbons (RH) were represented in this study. For the Low-NOx regime, $HO_2$ radical is proportional to RH but independent of NOx. OH radical is proportional to NOx but inversely-proportional to RH. $O_3$ production is proportional to NOx but has a weak dependence on RH. For the High-NOx regime, OH and $HO_2$ radicals concentrations and $O_3$ 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;
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