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2019년 서울지역 고농도 PM2.5 사례의 농도 특성 및 물리·화학적 생성 기여도 분석
송상근,한승범,문수환 한국대기환경학회 2022 한국대기환경학회지 Vol.38 No.2
This study investigated the characteristics of PM2.5 concentrations and meteorological conditions during three high PM2.5 episodes (Ep I: February 27~March 6, Ep II: March 11~12, and Ep III: March 19~20) observed in Seoul in 2019. This analysis was performed based on PM2.5 and meteorological observations and numerical modeling (WRF-CMAQ modeling system). An integrated process rate (IPR) analysis was used to evaluate the relative contributions of physical and chemical processes to PM2.5 production in the study area. High PM2.5 concentrations during the high PM2.5 episodes were mostly observed in the western and middle areas in Seoul. Significant differences (40~50 μg m-3) in the mean PM2.5 concentrations between the high PM2.5 episodes and non-episodes were estimated mainly in the western parts of Seoul. This might be primarily due to the combined effects of the transport of air pollutants from strong source regions (e.g., Chinese emissions), local emissions, and local meteorological conditions (e.g., high air temperature and low wind speed). From the IPR analysis, the contribution of horizontal transport to PM2.5 concentrations in most of the areas of Seoul during Ep I and Ep II was the most dominant, while the vertical transport and aerosol process during Ep III largely contributed to PM2.5 concentrations.