A simple semi-empirical photochemical model for the simulation of ozone concentration in the Seoul metropolitan area in Korea |
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| Institution: | 1. Department of Atmospheric Sciences, Pusan National University, Busan 609-735, Republic of Korea;2. School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Republic of Korea;1. Department of Physics, King Fahd University of Petroleum & Minerals, Dhahran 31261 Saudi Arabia;2. Air Quality Processes Research Section Environment Canada, Toronto, ON, Canada;1. State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei 230037, China;2. Key Laboratory of Electronic Restriction of Anhui Province, National University of Defense Technology, Hefei 230037, China;1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong dong, Buk-gu, Gwangju 500-712, Republic of Korea;2. Max-Planck-Institute for Chemistry, Mainz 55128, Germany |
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| Abstract: | O3 concentrations were simulated over the Seoul metropolitan area in Korea using a simple semi-empirical reaction (SEGRS) model which consists of generic reaction set (GRS), photochemical reaction set, and the diagnostic wind field generation model. The aggregated VOC emission strength was empirically scaled by the comparison of the simulated slope of (O3–2NO–NO2) concentration as a function of cumulative actinic light flux against measurements on high surface ozone concentration days with the relatively weak easterly geostrophic winds at the 850 hPa level in summer when the effect of horizontal advection was fairly small. The results indicated that the spatial distribution patterns and temporal variations of spatially averaged ground-level ozone concentrations were quite well simulated compared with those of observations with the modified volatile organic compound (VOC) emission strength. The diurnal trend of the surface ozone concentration and the maximum concentration compared observations were also quite reasonably simulated. However, the maximum ozone concentration occurring time at Seoul lagged about 2 h and the ozone concentration in the suburban area was slightly overestimated in the afternoon due to the influx of high ozone concentration from the urban area. It was found that the SEGRS model could be effectively used to simulate or predict the ground-level ozone concentration reasonably well without heavy computational cost provided the emission of ozone precursors are given. |
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