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Journal of the Korean Society for Environmental Analysis 2017;20(4):239-251.
Characterization of PM10 Concentration in Urban Gwangju and Its Source Identification Based on Cluster Analysis of Air Mass Trajectory
기류패턴에 따른 광주지역 PM 10 농도 특성 및 영향 배출원 추정 연구
송형명1, 이대행1, 이경석1, 안상수2, 이세행2, 양윤철1, 김선정1, 전홍대2, 서광엽3, 도우곤4, 조영관1
1광주광역시 보건환경연구원
2광주광역시보건환경연구원
3광구광역시보건환경연구원
4부산광역시보건환경연구원
Abstract
The average concentrations of PM10 in Gwangju decreased from 50 μg/m3 in 2008 to 45 μg/m3 in 2010, 41 μg/m3 in 2012 and 2014, and 40 μg/m3 in 2016. PM10 concentrations at Oseon-dong and Geonkun-dong were higher than those at other measurement sites. The backward trajectories for the sampling periods (2008-2016) were classified into three groups: (1) air masses related to long-range transport from China to Gwangju via the Yellow Sea (off the west coast of Korea) (clusters 1 and 2), (2) air masses related to local emissions From the Korean peninsula (clusters 3 and 4), and (3) air masses from the south (Cluster 5), The average concentrations of PM10 were 41.0, 48.1, 37.6, 43.3, and 33.3 for cluster 1,2,3,4, and 5, respectively. Cluster 2 had the highest PM10 concentration while cluster 5 had the lowest. Air masses fiom Cluster 1 and 2 were 29% and 13%, more frequent, respectively, during the entire period; the higher PM10 concentrations in these cases were influenced mainly by Beijing, Hebei, Shandong, Jiangsu, and Shanghai in China. This means that long-range transport aerosols contribute significantly to the PM10 concentration in Gwangju. Cluster 4, which was affected by many sources on the west coast area of Korea, also showed a high PM10 concentration; the slow floe of the air mass contributed to this. Therefore, the high concentration of PM10 in Gwangju area is influenced comprehensively by long-range transport, local emissions and the condition of the flow of the air mass.
Key Words: PM10, Trajectory, Cluster analysis, Emission location
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