Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Seasonal Variations of OC and EC in PM10, PM2.5 and PM1.0 at Gosan Superstation on Jeju Island

제주도 고산 PM10, PM2.5, PM1.0 중 OC와 EC의 계절별 변화 특성

  • Lim, Sae-Hee (Department of Earth and Environmental Sciences, Korea University) ;
  • Lee, Mee-Hye (Department of Earth and Environmental Sciences, Korea University) ;
  • Kang, Kyeong-Sik (College of Ocean Science, Jeju National University)
  • 임세희 (고려대학교 지구환경과학과) ;
  • 이미혜 (고려대학교 지구환경과학과) ;
  • 강경식 (제주대학교 해양과학부)
  • Received : 2010.05.23
  • Accepted : 2010.08.16
  • Published : 2010.10.31
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Abstract

Organic carbon (OC) and elemental carbon (EC) concentrations were determined for $PM_{10}$, $PM_{2.5}$ and $PM_{1.0}$ aerosols particles collected at Gosan Superstation on Jeju Island from August 2007 to September 2008. Aerosols were collected on quartz filters for 24 hours and then OC and EC were analyzed by TOR/IMPROVED method. Mean concentrations of OC and EC were $4.66\;{\mu}g/m^3$ and $1.69\;{\mu}g/m^3$ for $PM_{10}$, $3.95\;{\mu}g/m^3$ and $1.69\;{\mu}g/m^3$ for $PM_{2.5}$, and $3.16\;{\mu}g/m^3$ and $1.42\;{\mu}g/m^3$ for $PM_{1.0}$, respectively. The concentrations of OC and EC comprised 16.4% and 6.0% of $PM_{10}$, 22.9% and 9.8% of $PM_{2.5}$, and 23.0% and 10.0% of $PM_{1.0}$. OC and EC showed a clear seasonal variation with the highest in winter and the lowest in summer. The correlations between the two were also the best during the winter ($R^2$=0.87, 0.94, and 0.95 for $PM_{10}$, $PM_{2.5}$ and $PM_{1.0}$). The ratio of OC/EC exhibited the maximum (7.24) during an Asian dust event due to an increase of OC, which was possibly derived from soil. The mass fraction of both OC and EC was the highest in fall. When OC and EC concentrations were highly elevated, EC1 (the first EC fraction determined at $550^{\circ}C$) and pyrolyzed OC (POC) were dominant subcomponents in winter and OC3 (the third OC fraction determined at $450^{\circ}C$) and POC in spring.

Keywords

References

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