Air pollution inventories are aggregated around south-eastern part of the Korean Peninsular including Busan, Ulsan, and Changwon cities. Because densely populated cities are concentrated in this region, air pollutants emitted from one of these cities tend to be impacted on the air quality of other cities. In order to clarify the seasonal movement pattern of emitted particles, several numerical simulations using WRF/FLEXPART were carried out. Four cases were selected for each season. The Weather Research and Forecasting model (WRF) reproduced atmospheric flow fields with nested grids. The seasonal pattern of air mass of study area was determined by backward and forward trajectories. As a result, the air parcel moves from northwest to southeast due to northwesterly winds in spring and winter. Also air parcel transports from south to north in summer, and moves from west to east. Because the air mass moves differently in each season, these characteristics should be considered when performing air quality analysis.

Abstract
 1. 서 론
 2. 자료 및 방법
  2.1. 사례일 선정
  2.2. 실험설계
 3. 결과 및 고찰
 4. 결 론
 참 고 문 헌

• 이현미(부산대학교 지구환경시스템학부) | Hyun Mi Lee (Division of Earth Environmental System, Pusan National University)
• 이화운(부산대학교 지구환경시스템학부) | Hwa Woon Lee (Division of Earth Environmental System, Pusan National University)
• 이순환(부산대학교 환경연구원) | Soon Hwan Lee (Institute of Environmental Studies, Pusan National University) Corresponding author