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KMID : 1024520120210020153
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Journal of the Environmental Sciences
2012 Volume.21 No. 2 p.153 ~ p.163
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Characteristics of Surface Ozone in a Valley Area Located Downwind from Coastal Cities under Sea-breeze Condition: Seasonal Variation and Related Winds
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Kang Jae-Eun
Oh In-Bo
Song Sang-Geun
Kim Yoo-Keun
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Abstract
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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.
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KEYWORD
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Ozone concentration, Valley, Downwind of coastal city, Transport effect
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