Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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An Evaluation of the Influence of Boundary Conditions from GEOS-Chem on CMAQ Simulations over East Asia

동아시아지역에서 GEOS-Chem에 의한 경계조건이 CMAQ 모사 결과에 미치는 영향에 대한 평가

  • Choi, Dae-Ryun (Department of Environmental & Energy Engineering, Anyang University) ;
  • Koo, Youn-Seo (Department of Environmental & Energy Engineering, Anyang University)
  • 최대련 (안양대학교 환경에너지공학과) ;
  • 구윤서 (안양대학교 환경에너지공학과)
  • Received : 2013.01.03
  • Accepted : 2013.03.14
  • Published : 2013.04.30
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Abstract

The present work is an attempt to improve the performance of a regional air quality model by means of liking it with a global chemistry transport model. The global chemical transport model of GEOS-Chem is used to provide BC (Boundary Condition)s which reflect temporal and spatial variations at boundaries of regional chemical transport model of CMAQ over East Asia. First, GEOS-Chem outputs are evaluated by comparing predicted concentrations with observed monthly data of gas phase species and secondary inorganic aerosols from EANET (Acid Deposition Monitoring Network in East Asia) sites. The results show that predicted PM10 concentrations are in good agreement with the observations. This implies that GEOS-Chem outputs could be used to provide BCs to CMAQ. Simulated daily and monthly mean PM10 concentrations of CMAQ with the linkage of GEOS-Chem's BCs and constant BCs are then evaluated by comparing predicted concentrations with observations at API (Air Pollution Index) sites in China as well as EANET sites in Korea. CMAQ with the GEOS-Chem outputs improves model simulation in depicting observed PM10 concentrations comparing with those with constant BCs. It is also found that influence of aerosol species are largely dependent on the BCs over East Asia and Korea. Mean biases between simulated versus observed daily and monthly mean concentrations of PM10 with the GEOS-chem were improved by 1~8 ${\mu}g/m^3$ in China region, 3.26 ${\mu}g/m^3$ in Korea.

Keywords

References

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