Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

Temperature and Local Wind Flow Influencing Surface Ozone Enhancement in Seoul and Busan, Korea

서울 및 부산지역에서 기온과 국지풍이 지표 고농도 오존 발생에 미치는 영향

Kim, Yoo-Keun;Moon, Yun-Seob;Oh, In-Bo;Hwang, Mi-Kyoung
김유근;문윤섭;오인보;황미경

  • Published : 20020800
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Abstract

This paper analysed the effects of surface air temperature and local wind flow on surface ozone enhancement in two major Korean cities (Seoul and Busan). The analysis was based on hourly surface ozone and meterological data during the ozone season from 1998 to 2000. The relationships between the daily maximum temperature and ozone concentrations (1-h and 8-h average) were found to be weak in Seoul and insignificant in Busan. However, the probabilities of ozone exceedences above 8-h 60 ppb increased with temperature in both cities and exceeded 60% in Seoul for daily maximum temperature above $30^{\circ}C$. High ozone concentrations in both cities were observed under the low wind speed (< 3 $ms^{-1}$) during the morning and were related to the wind direction during the afternoon: westerly winds in Seoul and southerly winds in Busan (3-5 $ms^{-1}$). Furthermore, horizontal distributions of ozone exceedences and daily maximum 8-h ozone concentrations for a given wind speed in the daytime (1400-1600 LST) during episode days showed that high ozone concentrations were elevated around down town areas and were distributed more widely under low wind speed. On days with moderate wind, relatively high ozone concentrations occurred slightly downwind in the urban plume. In particular, the elevated ozone concentrations in Busan was observed along the coastal area under all given wind speed. As a result, ozone episodes in Seoul originated not only mainly in the photochemical activity due to the high surface air temperature but also partly in the weaken local advection from the western region, and that in Busan occurred in both the partly photochemical reaction along high air temperature of the coastal region and the strong transport of the rich air of ozone and its precursors gases due to the see-breeze of the southerly winds.

Keywords

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