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Korean Meteorological Society (한국기상학회)
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Examining the Non-spherical Effect of Asian Dust Particle Onaerosol Optical Depth

황사의 비구형성이 에어러솔 광학적 두께 산출에 미치는 영향 연구

  • Lee, Hyun-Ju (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kim, Sang-Woo (School of Earth and Environmental Sciences, Seoul National University) ;
  • Yoon, Soon-Chang (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kang, Jung-Yoon (Korea Institute of Atmospheric Prediction Systems)
  • 이현주 (서울대학교지구환경과학부) ;
  • 김상우 (서울대학교지구환경과학부) ;
  • 윤순창 (서울대학교지구환경과학부) ;
  • 강정윤 (한국형수치모델개발사업단)
  • Received : 2011.12.26
  • Accepted : 2012.02.27
  • Published : 2012.06.30
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Abstract

In this study, we investigate the effects of elliptical shape of Asian dust particles on the estimation of aerosol optical depth by implementing T-matrix method into WRF/Chem Dust Model. The phase function calculated by assuming elliptical particle shape near $110{\sim}160^{\circ}$ of scattering angle showed about 20 times larger than that calculated by assuming spherical particle shape. Significant difference of extinction efficiency was found with an increase of size parameter and aspect ratio. From the simulations of two Asian dust events occurred on 1 April 2007 and 16 March 2010, we found that the difference of extinction efficiency between elliptical and spherical particle shape was about 5~8%. The aerosol optical depth calculated by assuming elliptical particle shape with 1.6, 1.4 and 1.2 of aspect ratio was about $4.0{\pm}0.5%$, $2.0{\pm}0.2%$, and $1.0{\pm}0.1%$ larger than those estimated by assuming spherical particle shape.

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References

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