WRF-CMAQ 양방향 결합모델을 이용한 에어로졸 직접 피드백 효과가 기상 및 미세먼지에 미치는 영향: 2019년 고농도 PM2.5 사례 (Direct Aerosol Feedback Effects on Meteorology and Particulate Matter Using the WRF-CMAQ Two-way Coupled Model: A High PM2.5 Event in 2019)

서지정보

· 발행기관 : 한국대기환경학회
· 수록지 정보 : 한국대기환경학회지 / 41권 / 1호 / 83 ~ 103페이지
· 저자명 : 송상근, 김진승, 조성빈

초록

This study investigated the impact of direct aerosol feedback (DAF) on meteorology and particulate matter (PM10 and PM2.5) using the WRF-CMAQ two-way coupled model during a high PM2.5 event observed in South Korea from February 17 to March 15, 2019. The impact was quantified by analyzing differences in meteorological variables and PM concentrations between simulations that included DAF (i.e., YF) and those that did not include DAF (i.e., NF). Overall, the effect of DAF (YF minus NF) was more pronounced as the PM concentration in the air increased. The DAF effect was generally stronger in the northwestern and/or western regions of South Korea than in the eastern regions. In the study area, primarily over land, the DAF effect was found to decrease solar radiation, planetary boundary layer height, air temperature, and wind speed, with average changes of -0.54 MJ m-2, -29 m, -0.14°C, and -0.04 m s-1, respectively, while increasing relative humidity by an average of +0.8%. These changes in meteorological variables due to the DAF effect resulted in an average increase in PM10 and PM2.5 concentrations (0.25 μg m-3 and 0.49 μg m-3, respectively) over land in South Korea. Interestingly, in the southern regions, the DAF effect led to a decrease in PM concentrations, primarily due to a reduction in the concentrations of secondary aerosols (mainly NO3 -) and precursors (mainly HNO3) and partly due to differences in meteorological conditions (small changes in wind speed and relative humidity). In addition, the magnitude of the DAF effect in ocean areas was found to be mostly lower than that in land areas.

영어초록

This study investigated the impact of direct aerosol feedback (DAF) on meteorology and particulate matter (PM10 and PM2.5) using the WRF-CMAQ two-way coupled model during a high PM2.5 event observed in South Korea from February 17 to March 15, 2019. The impact was quantified by analyzing differences in meteorological variables and PM concentrations between simulations that included DAF (i.e., YF) and those that did not include DAF (i.e., NF). Overall, the effect of DAF (YF minus NF) was more pronounced as the PM concentration in the air increased. The DAF effect was generally stronger in the northwestern and/or western regions of South Korea than in the eastern regions. In the study area, primarily over land, the DAF effect was found to decrease solar radiation, planetary boundary layer height, air temperature, and wind speed, with average changes of -0.54 MJ m-2, -29 m, -0.14°C, and -0.04 m s-1, respectively, while increasing relative humidity by an average of +0.8%. These changes in meteorological variables due to the DAF effect resulted in an average increase in PM10 and PM2.5 concentrations (0.25 μg m-3 and 0.49 μg m-3, respectively) over land in South Korea. Interestingly, in the southern regions, the DAF effect led to a decrease in PM concentrations, primarily due to a reduction in the concentrations of secondary aerosols (mainly NO3 -) and precursors (mainly HNO3) and partly due to differences in meteorological conditions (small changes in wind speed and relative humidity). In addition, the magnitude of the DAF effect in ocean areas was found to be mostly lower than that in land areas.

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