Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Characteristics of Visibility Impairment by Semi-Continuous Optical and Chemical Property Monitoring of Aerosols in Seoul

에어로졸의 광학 및 화학 특성 준실시간 모니터링을 통한 서울지역 시정 감쇄 분석

  • Park, Jong-Sung (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research) ;
  • Park, Seung-Myung (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research) ;
  • Song, In-Ho (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research) ;
  • Shin, Hye-Jung (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research) ;
  • Hong, You-Deog (Department of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental Research)
  • 박종성 (국립환경과학원 기후대기연구부 대기환경연구과) ;
  • 박승명 (국립환경과학원 기후대기연구부 대기환경연구과) ;
  • 송인호 (국립환경과학원 기후대기연구부 대기환경연구과) ;
  • 신혜정 (국립환경과학원 기후대기연구부 대기환경연구과) ;
  • 홍유덕 (국립환경과학원 기후대기연구부 대기환경연구과)
  • Received : 2015.04.14
  • Accepted : 2015.07.03
  • Published : 2015.08.31
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Abstract

The characteristics of aerosol light extinction were investigated by comparing measured and calculated extinction coefficient to understand the contribution of air pollutants on visibility impairment for data during 4 months (Jan~ April), 2014. The integrated nephelometer and aethalometer system were installed to measure the scattering and absorption coefficients of aerosol as well as BAM 1020, MARGA, semi-continuous OCEC analyzer, and online-XRF to calculate the extinction coefficient. The IMPROVE_2005 equation was used to determine the contributions of different chemical components on visibility impairment in $PM_{2.5}$ and $PM_{10}$ due to highest correlation with measured data. Sulfate, nitrate, and organic mass by carbon (OMC) of fine aerosol were the major contributors affecting on visibility impairment. Total contributions to light extinction were calculated as $631.0Mm^{-1}$ for the worst-case and $64.4Mm^{-1}$ for the best-case. The concentrations of aerosol component for the worst-case were 38.4 times and 45.5 times larger than those of the best-case for $(NH_4)_2SO_4$ and $NH_4NO_3$, respectively. At lower visibility condition, in which extinction coefficient was higher than $400Mm^{-1}$, extinction coefficient varied according to the relative humidity variation regardless of $PM_{2.5}$.

Keywords

References

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