(주)에이피엠엔지니어링

2018년 3월 고농도 PM_2.5 사례 분석에서 대기 순환 및 확산 지표의 적용 가능성 연구

Applicability Study of Atmospheric Circulation and Ventilation Indices to Analysis of PM2.5 Episode in March 2018

Abstract 

Recirculation factor (RF), ventilation index (VI), and stable energy (SE) of the atmosphere are the indices that could quantify the kinematic ability of the atmosphere. To verify the relationship of RF, VI, and SE with PM2.5 and its components, this 

study analyzed the measurement data on Air Pollution Monitoring Supersite in March 2018, when the calm wind condition

was prevailingly observed. In this study, the period of PM2.5 episode was selected from 06 KST on March 24th to 13 KST on 

March 26th, 2018. Since March 25th, the PM2.5 concentration remained at most 100 μg/m3. At that time, the RF

continuously decreased and showed the lowest value (0.56) at 06 KST on March 26th. The correlation coefficients of PM2.5

and its components (SO42-, NO3-, NH4+, OC, EC) concentrations with meteorological factors (air temperature, relative

humidity, wind speed, and planetary boundary layer height (PBLH)) and atmospheric indices during this episode were the 

highest among the entire period in March 2018, particularly for SE. When the SE was greater than 40 J/cm2, the VI was 

smaller than 2,000 m2/s, and the RF was smaller than 0.8, the PM2.5 concentration during this episode was shown to be 

relatively high. In conclusion, the circulation and ventilation indices could be alternative ways to explain the PM2.5 episode,

compared to wellknown meteorological factors in case of regional atmospheric stagnation.  

Key words 

PM2.5 episode, Atmospheric stagnation, Recirculation factor, Ventilation index, Stable energy

▶출처 : 한국대기환경학회지 제 38권 제 4호, 2022.08 pp. 542-556