Characteristics of Surface Ozone in a Valley Area Located Downwind from Coastal Cities under Sea-breeze Condition: Seasonal Variation and Related Winds

연안 대도시 해풍 풍하측 계곡지역의 지표오존 분포 특성: 계절변화와 바람과의 관계

  • Kang, Jae-Eun (Division of Earth Environmental System, Pusan National University) ;
  • Oh, In-Bo (Environmental Health Center, University of Ulsan) ;
  • Song, Sang-Keun (Division of Earth Environmental System, Pusan National University) ;
  • Kim, Yoo-Keun (Division of Earth Environmental System, Pusan National University)
  • 강재은 (부산대학교 지구환경시스템학부) ;
  • 오인보 (울산대학교 환경보건센터) ;
  • 송상근 (부산대학교 지구환경시스템학부) ;
  • 김유근 (부산대학교 지구환경시스템학부)
  • Received : 2011.05.20
  • Accepted : 2012.01.26
  • Published : 2012.02.29


The seasonal variations of ozone ($O_3$) concentrations were investigated with regard to the relationship between $O_3$ and wind distributions at two different sites (Jung Ang (JA): a semi-closed topography and Seo Chang (SC): a closed topography) within a valley city (Yangsan) and their comparison between these sites (JA and SC) and two non-valley sites (Dae Jeo (DJ) and Sang Nam (SN)) located downwind from coastal cities (Busan and Ulsan). This analysis was performed using the data sets of hourly $O_3$ concentrations, meteorological factors (especially, wind speed and direction), and those on high $O_3$ days exceeding the 8-h standard (60 ppb) during 2008-2009. In summer and fall (especially in June and October), the monthly mean values of the daily maximum $O_3$ concentrations and the number of high $O_3$ days at JA (and SC) were relatively higher than those at DJ (and SN). The increase in daytime $O_3$ concentrations at JA in June was likely to be primarily impacted by the transport of $O_3$ and its precursors from the coastal emission sources in Busan along the dominant southwesterly winds (about 5 m/s) under the penetration of sea breeze condition, compared to other months and sites. Such a phenomenon at SC in October was likely to be mainly caused by the accumulation of $O_3$ and its precursors due to the relatively weak winds under the localized stagnant weather condition rather than the contribution of regional transport from the emission sources in Busan and Ulsan.


Ozone concentration;Valley;Downwind of coastal city;Transport effect


Supported by : 부산대학교


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