춘천과 서울에서 측정한 PM2.5 내 탄소성분의 농도 특성에 관한 연구

초록

PM2.5 samples were collected from December 2005 through November 2007 in two cities including Chuncheon and Seoul in order to investigate the characteristics of carbonaceous aerosol. The average PM2.5 concentration in Seoul (43.2 μg/m3) was approximately 1.2 times higher than that measured in Chuncheon (36.1 μg/m3), however there was no statistical difference on PM2.5 concentration between those two cities. Backward trajectories were passing through Seoul area before arriving Chuncheon for about half of the samples, and PM2.5 largely increased in Chuncheon when back-trajectories originated from Seoul area. Total carbon (TC) was calculated as sum of OC and EC, contributing 20.5% and 29.2% to total PM2.5 mass in Chuncheon and Seoul, respectively. The average ratio of secondary organic carbon (SOC) to total OC was 40% at both sites, and the highest SOC concentration was observed in summer probably due to enhanced volatilization of organic species and active photochemical reaction. J value was calculated to determine if acidic condition affected the increase of secondary organic carbon. In both Chuncheon and Seoul SOC/OC ratios were fairly enhanced when J＜100% of acidic condition.

키워드