2018년 11월 광주 지역에서 발생한 미세먼지 고농도 사례 시 수용성 성분의 크기 분포 조사

• Published in: 한국대기환경학회지(국문) Vol. 35; no. 4; pp. 423 - 437
• Main Authors: 손세창(Se-Chang Son), 박승식(Seungshik Park)
• Format: Journal Article
• Language: Korean
• Published: 한국대기환경학회 01.08.2019
• Subjects: 대기과학; Secondary ionic species; Mass size distribution; Droplet mode; Condensation mode; High pollution episode; Water-soluble organic carbon
• ISSN: 1598-7132; 2383-5346
• DOI: 10.5572/KOSAE.2019.35.4.423

In this study, mass size distributions of ambient aerosol particles and their water-soluble organic and inorganic species were investigated under high pollution episode. To achieve the aim of this study, 24-hr integrated size-segregated aerosol samples were collected at an ubran site of Gwangju between November 02 and 16, 2018, and analyzed for mass, water-soluble organic carbon (WSOC), and ionic species. During study period, a high pollution episode of fine particulate matter (PM) occurred between November 02 and 07, possibly due to high pressure developed around Korean peninsula, extremely stable air conditions, and long-range transportation of aerosol particles from North Korea and northeastern China region. On November 02~03 when influence of local pollution dominated, ambient aerosol particles, WSOC, NO3 -, SO4 2-, and NH4 + exhibited bi-modal size distributions with a condensation mode at a particle size of 0.32 μm and a droplet mode at a particle size of 1.0 μm in PM1.8. While, between November 05 and 07 when long-range transportation of PM was mixed with locally-produced pollution, they showed very pronounced droplet mode size distributions at 1.0 μm, without a condensation mode. NO3 - concentration in PM1.8 during pollution episode increased significantly from 5.9 μg/m3 on November 02 to 21.5 μg/m3 on November 06, while SO4 2- in PM1.8 increased from 1.6 to 5.8 μg/m3, indicating the dominance of local pollution during pollution episode. Furthermore, for WSOC, NO3 -, SO4 2-, and NH4 +, fraction of droplet mode size (PM0.55-1.8) to PM1.8 increased gradually as PM pollution got increased, while the condensation mode (PM0.17-0.32) contribution decreased. In addition, it was demonstrated that relative humidity could be an important factor promoting formation of droplet mode WSOC, NO3 -, and SO4 2-. KCI Citation Count: 1