Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
권호 표지

Effect of light intensity on the ozone formation and the aerosol number concentration of ambient air in Seoul

광도가 서울 대기의 오존 생성 및 에어로졸 수 농도에 미치는 영향

  • Bae, Gwi-Nam (Center for Environmental Technology Research, Korea Institute of Science and Technology) ;
  • Park, Ju-Yeon (Korea Hydro & Nuclear Power Co., Ltd.) ;
  • Kim, Min Cheol (Analytical Instrumentation Research Institute, Samyang Chemical Co., Ltd.) ;
  • Lee, Seung-Bok (Center for Environmental Technology Research, Korea Institute of Science and Technology) ;
  • Moon, Kil-Choo (Center for Environmental Technology Research, Korea Institute of Science and Technology) ;
  • Kim, Yong Pyo (Department of Environmental Science and Engineering, Ewha Womans University)
  • 배귀남 (한국과학기술연구원 환경기술연구단) ;
  • 박주연 (한국수력원자력(주) 고리본부 2발전소 계통기술부) ;
  • 김민철 (삼양화학공업(주) 분석기기연구소) ;
  • 이승복 (한국과학기술연구원 환경기술연구단) ;
  • 문길주 (한국과학기술연구원 환경기술연구단) ;
  • 김용표 (이화여자대학교 환경학과)
  • Received : 2008.03.19
  • Accepted : 2008.05.07
  • Published : 2008.06.20
Download PDF
⟨ Previous Next ⟩

Abstract

The effect of light intensity on the ozone formation and the aerosol number concentration during the photochemical reactions of ambient air was investigated in an indoor smog chamber. The smog chamber consists of a housing, 64 blacklights, and a $2.5-m^3$ reaction bag made of Teflon film. The bag was filled with the unfiltered ambient air in Seoul from January 10 to March 18, 2002. In this work, the photolysis rate of $NO_2$, $k_1$ was used as an index of light intensity. Three levels of light intensity were controlled by changing the number of blacklights turned on among 64 blacklights: $0.29min^{-1}$ (50%), $0.44min^{-1}$ (75%), $0.57min^{-1}$ (100%). The ozone concentration increased rapidly within 10 minutes after irradiation irrespective of light intensity, thereafter it increased linearly during the irradiation. The ozone production rate seems to be dependent on both the light intensity and the quality of ambient air introduced into the reaction bag. The change in aerosol number concentration also depended on both the light intensity and the ambient air quality, especially aerosol size distribution. Based on the initial ambient aerosol size distributions, the photochemical potential for aerosol formation and growth is classified into two cases. One is the case showing aerosol formation and growth processes, and the other is the case showing no apparent change in particle size distribution.

Keywords