Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Major factors determining the size distributions of atmospheric water-soluble aerosol particles at an urban site during winter

겨울철 도시지역 대기 수용성 에어로졸 입자의 크기 분포를 결정하는 주요 인자

  • Park, Seungshik (Department of Environment and Energy Engineering, Chonnam National University)
  • 박승식 (전남대학교 환경에너지공학과)
  • Received : 2021.08.03
  • Accepted : 2021.09.01
  • Published : 2021.09.30
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Abstract

Size distributions of atmospheric particulate matter (PM) and its water-soluble organic and inorganic components were measured between January and February 2021 at an urban site in Gwangju in order to identify the major factors that determine their size distributions. Their size distributions during the study period were mainly divided into two groups. In the first group, PM, NO3-, SO42-, NH4+ and water-soluble organic carbon (WSOC) exhibited bi-modal size distributions with a dominant condensation mode at a particle size of 0.32 ㎛. This group was dominated by local production of secondary water-soluble components under atmospheric stagnation and low relative humidity (RH) conditions, rather than long-range transportation of aerosol particles from China. On the other hand, in the second group, they showed tri-modal size distributions with a very pronounced droplet mode at a diameter of 1.0 ㎛. These size distributions were attributable to the local generation and accumulation of secondary aerosol particles under atmospheric conditions such as atmospheric stagnation and high RH, and an increase in the influx of atmospheric aerosol particles by long-distance transportation abroad. Contributions of droplet mode NO3-, SO42-, NH4+ and WSOC to fine particles in the second group were significantly higher than those in the first group period. However, their condensation mode contributions were about two-fold higher in the first group than in the second group. The significant difference in the size distribution of the accumulation mode of the WSOC and secondary ionic components between the two groups was due to the influx of aerosol particles with a long residence time by long-distance transport from China and local weather conditions (e.g., RH).

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Acknowledgement

이 논문은 2020년도 정부(교육부)의 재원으로 한국연구재단 기초연구사업의 지원(NRF-2020R1I1A3A04036617)과 2020년 정부(과학기술정보통신부)의 재원으로 한국연구재단 기후변화대응 기술개발사업의 지원을 받아 수행된 연구입니다(No. 2019M1A2A2103953). 또한 대기측정 및 성분 분석에 도움을 준 전남대학교 환경에너지공학과의 성병철, 최지율, 최연정 학생에게 감사를 표합니다.

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