Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Diurnal Variations of O3 and NO2 Concentrations in an Urban Park in Summer: Effects of Air Temperature and Wind Speed

여름철 도심 공원의 O3과 NO2 농도의 일변화: 기온과 풍속의 영향

  • Han, Beom-Soon (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kwak, Kyung-Hwan (School of Natural Resources and Environmental Science, Kangwon National University) ;
  • Baik, Jong-Jin (School of Earth and Environmental Sciences, Seoul National University)
  • 한범순 (서울대학교 지구환경과학부) ;
  • 곽경환 (강원대학교 환경융합학부) ;
  • 백종진 (서울대학교 지구환경과학부)
  • Received : 2016.09.20
  • Accepted : 2016.10.05
  • Published : 2016.10.31
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Abstract

The diurnal variations of $O_3$ and $NO_2$ in an urban park and the effects of air temperature and wind speed on the diurnal variations are investigated. $O_3$ and $NO_2$ concentrations were observed at a site in an urban park of Seoul from 27 July 2015 to 9 August 2015. The $O_3$ and $NO_2$ concentrations observed in the urban park are compared to those observed at the Gangnam air quality monitoring station (AQMS). The $O_3$ concentration is higher in the urban park than at the Gangnam AQMS in the daytime because the amount of $O_3$ dissociated by NO is smaller as well as partly because the amount of $O_3$ produced in the oxidation process of biogenic volatile organic compounds (VOCs) is larger in the urban park than at the Gangnam AQMS. The $NO_2$ concentration is lower in the urban park than at the Gangnam AQMS during day and night because the observation site in the urban park is relatively far from roads where $NO_x$ is freshly emitted from vehicles. The difference in $NO_2$ concentration is larger in the daytime than in the nighttime. To examine the effects of air temperature and wind speed on the diurnal variations of $O_3$ and $NO_2$, the observed $O_3$ and $NO_2$ concentrations are classified into high or low air temperature and high or low wind speed days. The high $O_3$ and $NO_2$ concentrations in the daytime appear for the high air temperature and low wind speed days. This is because the daytime photochemical processes are favorable when the air temperature is high and the wind speed is low. The scatter plots of the daytime maximum $O_3$ and minimum $NO_2$ concentrations versus the daytime averages of air temperature and wind speed show that the daytime maximum $O_3$ and minimum $NO_2$ concentrations tend to increase as the air temperature increases or the wind speed decreases. The daytime maximum $O_3$ concentration is more sensitive to the changes in air temperature and wind speed in the urban park than at the Gangnam AQMS.

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