Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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A Study on the Application of Local-scale Air Mass Recirculation Factor to High-concentration PM2.5 Episode in Coastal Areas

연안 지역 고농도 PM2.5 사례에 대한 국지 규모 공기괴 재순환 지수 적용 연구

  • Jung-woo Yoo (Institute of Environmental Studies, Pusan National University) ;
  • Ji Seon Kim (Department of Earth Science, Pusan National University) ;
  • Eun Ji Kim (Department of Earth Science Education, Pusan National University) ;
  • Soon-Hwan Lee (Department of Earth Science Education, Pusan National University)
  • 유정우 (부산대학교 환경연구원) ;
  • 김지선 (부산대학교 지구과학과) ;
  • 김은지 (부산대학교 지구과학교육과) ;
  • 이순환 (부산대학교 지구과학교육과)
  • Received : 2023.07.30
  • Accepted : 2023.08.07
  • Published : 2023.08.31
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Abstract

This study analyzed the impact of recirculation on high-concentration PM2.5 in the coastal area. Through the analysis of observational data, it was observed that the development of sea breeze led to an increase in PM2.5 and SO42- concentrations. Hysplit backward trajectory analysis confirmed the occurrence of air mass recirculation. Results from WRF and CMAQ numerical simulations indicated that pollutants transported from land to sea during the night were re-transported to the land by daytime sea breeze, leading to high-concentration PM2.5 in Busan. To quantitatively investigate the recirculation a recirculation factor (RF) was calculated, showing an increase in RF values during high-concentration PM2.5 episodes. However, the RF values varied slightly depending on the time resolution of meteorological data used for the calculations. This variation was attributed to the terrain characteristics at observation sites. Additionally, during long-range transported days leading to nationwide high-concentration PM2.5 events, synoptic-scale circulation dominated, resulting in weaker correlation between PM2.5 concentration and RF values. This study enhances the understanding of the influence of recirculation on air pollution. However, it is important to consider the impact of temporal resolution and terrain characteristics when using RF for evaluating recirculation during episodes of air pollution.

Keywords

Acknowledgement

이 논문은 2020년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임 (No. 2020R1A6A3A01100038 and 2020R1A6A1A03044834).

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