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

• Published in: 한국대기환경학회지 Vol. 31; no. 4; pp. 319 - 329
• Main Authors: 박종성(Jong-Sung Park), 박승명(Seung-Myung Park), 송인호(In-Ho Song), 신혜정(Hye-Jung Shin), 홍유덕(You-Deog Hong)
• Format: Journal Article
• Language: Korean
• Published: 한국대기환경학회 2015
• Subjects: 대기과학; Extinction budget; Visibility; Nephelometer; Seoul intensive atmospheric monitoring station; Aethalometer
• ISSN: 1598-7132; 2383-5346
• DOI: 10.5572/KOSAE.2015.31.4.319

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 $PM_{2.5}$.