Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
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Distribution Characteristics and Background Air Classification of PM2.5 OC and EC in Summer Monsoon Season at the Anmyeondo Global Atmosphere Watch (GAW) Regional Station

안면도 기후변화감시소의 여름철 PM2.5 OC와 EC 분포 특성 및 배경대기 구분

  • Ham, Jeeyoung (Anmyeondo Global Atmosphere Watch Station, Environmental Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Lee, Meehye (Department of Earth and Environmental Sciences, Korea University) ;
  • Ryoo, Sang-Boom (Anmyeondo Global Atmosphere Watch Station, Environmental Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Lee, Young-Gon (Anmyeondo Global Atmosphere Watch Station, Environmental Meteorology Research Division, National Institute of Meteorological Sciences)
  • 함지영 (국립기상과학원 환경기상연구과 안면도 기후변화감시소) ;
  • 이미혜 (고려대학교 지구환경과학과) ;
  • 류상범 (국립기상과학원 환경기상연구과 안면도 기후변화감시소) ;
  • 이영곤 (국립기상과학원 환경기상연구과 안면도 기후변화감시소)
  • Received : 2019.07.17
  • Accepted : 2019.10.01
  • Published : 2019.11.30
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Abstract

Organic carbon (OC) and elemental carbon (EC) in PM2.5 were measured with Sunset Laboratory Model-5 Semi-Continuous OC/EC Field Analyzer by NIOSH/TOT method at Anmyeondo Global Atmosphere Watch (GAW) Regional Station (37°32'N, 127°19'E) in July and August, 2017. The mean values of OC and EC were 3.7 ㎍ m-3 and 0.7 ㎍ m-3, respectively. During the study period, the concentrations of reactive gases and aerosol compositions were evidently lower than those of other seasons. It is mostly due to meteorological setting of the northeast Asia, where the influence of continental outflow is at its minimum during this season under southwesterly wind. While the diurnal variation of OC and EC were not clear, the concentrations of O3, CO, NOx, EC, and OC were evidently enhanced under easterly wind at night from 20:00 to 8:00. However, the high concentration of EC was observed concurrently with CO and NOx under northerly wind during 20:00~24:00. It indicates the influence of thermal power plant and industrial facilities, which was recognized as a major emission source during KORUS-AQ campaign. The diurnal variations of pollutants clearly showed the influence of land-sea breeze, in which OC showed good correlation between EC and O3 in seabreeze. It is estimated to be the recirculation of pollutants in land-sea breeze cycle. This study suggests that in general, Anmyeondo station serves well as a background monitoring station. However, the variation in meteorological condition is so dynamic that it is primary factor to determine the concentrations of secondary species as well as primary pollutants at Anmyeondo station.

Keywords

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