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Measurement of Optical Properties of Ice-crystal Cloud using LIDAR System and Retrieval of Its Radiative Forcing by Radiative Transfer Model

라이다 시스템을 이용한 ice-crystal cloud의 광학적 특성 관측 및 복사 전달 모델을 통한 복사강제력 산출

  • Noh, Young-Min (Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology) ;
  • Shin, Dong-Ho (Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology) ;
  • Lee, Kyung-Hwa (Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology) ;
  • Muller, Detlef (Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology) ;
  • Kim, Young-J. (Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology)
  • 노영민 (광주과학기술원 환경공학과) ;
  • 신동호 (광주과학기술원 환경공학과) ;
  • 이경화 (광주과학기술원 환경공학과) ;
  • ;
  • 김영준 (광주과학기술원 환경공학과)
  • Published : 2009.10.31

Abstract

Ice-crystal clouds observation was conducted using a GIST/ADEMRC Multi-wavelength Raman lidar system in order to measure vertical profile and optical depth at Gwangju ($35^{\circ}$10'N, $126^{\circ}$53'E), Korea in December 2002, and March and April 2003. Ice-crystal clouds at high altitude can be distinguished from atmospheric aerosols by high depolarization ratio and high altitude. Ice-crystal clouds were observed at 5~12 km altitudes with a high depolarization ratio from 0.2 to 0.5. Optical depth of ice-crystal clouds had varied from 0.14 to 1.81. The radiative effect of observed ice-crystal cloud on climate system was estimated to be negative net flux in short wavelength (0.25~$4.0{\mu}m$) and positive net flux in short+long wavelength (0.25~$100{\mu}m$) at top of the atmosphere. Net flux by ice-crys tal cloud per unit optical depth was comparable to that of Asian dust.

Keywords

References

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