Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Tracer Experiment for the Investigation of Urban Scale Dispersion of Air Pollutants - Simulation by CALPUFF Dispersion Model and Diffusion Feature of Tracer Gases

추적자 확산 실험에 의한 서울 도심 확산 현상 연구 - 추적기체의 확산특징과 CALPUFF 모델에 의한 모사

  • Lee, Chong-Bum (Kangwon National University, Department of Environmental Science) ;
  • Kim, Jea-Chul (Kangwon National University, Department of Environmental Science) ;
  • Lee, Gang-Woong (Hankuk University of Foreign Studies Department of Environmental Science) ;
  • Ro, Chul-Un (Inha University, Department of Chemistry) ;
  • Kim, Hye-Kyeong (Inha University, Department of Chemistry)
  • Published : 2007.08.31
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Abstract

A series of tracer experiments for the evaluation of atmospheric dispersion was performed over the urban area of Seoul using two inert, non-deposition perfluorocarbon (PMCH and m-PDCH) gases during three years campaign on 2002, 2003 and 2005. 30 sampling sites for collecting these tracers were located along two arcs of 2.5 and 5 kilometers downwind from the release point. About ten measurements which each lasted for 2 hours or 4 hours were made over the two consecutive days during each campaign. CALPUFF and MM5 meteorological model were applied to evaluate the urban dispersion in detail. Size of Modeling domain was $27\;km{\times}23\;km$ and the fine nest in the modeling domain had a grid size of 0.5 km. The results showed that CALPUFF dispersion model had a tendency to estimate tracer concentrations about $2{\sim}5$ times less than those of ambient samples under many conditions. These consistent inaccuracy in urban dispersion was attributed to inherent inaccuracy and lack of details in terrain data at urban area.

Keywords

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