Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Variation of OC and EC in PM2.5 at Mt. Taehwa

태화산 PM2.5 OC와 EC의 변화 특성

  • Ham, Jeeyoung (Department of Earth and Environmental Sciences, Korea University) ;
  • Lee, Meehye (Department of Earth and Environmental Sciences, Korea University) ;
  • Kim, Hyun Seok (Department of Forest Sciences, Seoul National University) ;
  • Park, Hyunju (National Institute of Environmental Research, Air Quality Research Division) ;
  • Cho, Gangnam (National Institute of Environmental Research, Air Quality Research Division) ;
  • Park, Jungmin (National Institute of Environmental Research, Air Quality Research Division)
  • 함지영 (고려대학교 지구환경과학과) ;
  • 이미혜 (고려대학교 지구환경과학과) ;
  • 김현석 (서울대학교 농업생명대학교 산림과학부 산림환경학전공) ;
  • 박현주 (국립환경과학원 대기환경연구과) ;
  • 조강남 (국립환경과학원 대기환경연구과) ;
  • 박정민 (국립환경과학원 대기환경연구과)
  • Received : 2015.09.09
  • Accepted : 2015.12.15
  • Published : 2016.02.29
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Abstract

Organic carbon (OC) and elemental carbon (EC) in $PM_{2.5}$ were measured with Sunset OC/EC Field Analyzer at Taehwa Research Forest (TRF) near Seoul metropolitan area from May 2013 to April 2014. During the study period, the mean concentrations of OC and EC were $5.0{\pm}3.2{\mu}gC/m^3$ and $1.7{\pm}1.0{\mu}gC/m^3$, respectively. They showed clear seasonality reaching their maximum in winter ($6.5{\mu}gC/m^3$ and $1.9{\mu}gC/m^3$) and minimum in wet summer ($2.5{\mu}gC/m^3$ and $1.4{\mu}gC/m^3$). While OC showed greater seasonal variation, the diurnal variation was more noticeable for EC through all seasons with a clear maximum in the morning, which reveals the influence of vehicle emissions. In contrast, OC exhibited a broad second peak in the afternoon during May~June, when biological activities were the highest. Using the morning peaks of EC and OC, primary OC/EC ratio was assessed, which was assumed to be anthropogenic origin. It was the greatest in winter followed by spring and the lowest in wet summer. The seasonal difference in primary OC/EC ratio implies the influence of non-local sources of OC at the Mt. Taehwa.

Keywords

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