Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Effect of Air Stagnation Conditions on Mass Size Distributions of Water-soluble Aerosol Particles

대기 정체와 수용성 에어로졸 입자의 질량크기분포의 관계

  • Park, Seungshik (Department of Environment and Energy Engineering, Chonnam National University) ;
  • Yu, Geun-Hye (Department of Environment and Energy Engineering, Chonnam National University)
  • 박승식 (전남대학교 환경에너지공학과) ;
  • 유근혜 (전남대학교 환경에너지공학과)
  • Received : 2018.06.08
  • Accepted : 2018.06.11
  • Published : 2018.06.30
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Abstract

Measurements of 24-hr size-segregated ambient particles were made at an urban site of Gwangju under high pressure conditions occurred in the Korean Peninsula late in March 2018. The aim of this study was to understand the effect of air stagnation on mass size distributions and formation pathways of water-soluble organic and inorganic components. During the study period, the $NO_3{^-}$, $SO_4{^{2-}}$, $NH_4{^+}$, water-soluble organic carbon (WSOC), and humic-like substances(HULIS) exhibited mostly bi-modal size distributions peaking at 1.0 and $6.2{\mu}m$, with predominant droplet modes. In particular, outstanding droplet mode size distributions were observed on March 25 when a severe haze occurred due to stable air conditions and long range transport of aerosol particles from northeastern regions of China. Air stagnation conditions and high relative humidity during the study period resulted in accumulation of primary aerosol particles from local emission sources and enhanced formation of secondary ionic and organic aerosols through aqueous-phase oxidations of $SO_2$, $NO_2$, $NH_3$, and volatile organic compounds, leading to their dominant droplet mode size distributions at particle size of $1.0{\mu}m$. From the size distribution of $K^+$ in accumulation mode, it can be inferred that in addition to the secondary organic aerosol formations, accumulation mode WSOC and HULIS could be partly attributed to biomass burning emissions.

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References

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