Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Determination of the Lidar Ratio Using the GIST / ADEMRC Multi-wavelength Raman Lidar System at Anmyeon Island

GIST/ADEMRC 다파장 라만 라이다 시스템을 이용한 안면도 지역에서의 라이다 비 연구

  • Noh Young Min (Advanced Environmental Monitoring Research Center, Department of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
  • Kim Young Min (Advanced Environmental Monitoring Research Center, Department of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
  • Kim Young Joon (Advanced Environmental Monitoring Research Center, Department of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
  • Choi Byoung Chul (Korea Global Atmospheric Watch Observatory (KGAWO) Meteorological Research Institute (METRI))
  • 노영민 (광주과학가술원 환경공학과, 환경 모니터링 신기술 연구센터) ;
  • 김영민 (광주과학가술원 환경공학과, 환경 모니터링 신기술 연구센터) ;
  • 김영준 (광주과학가술원 환경공학과, 환경 모니터링 신기술 연구센터) ;
  • 최병철 (기상연구소 지구대기감시관측소)
  • Published : 2006.02.01
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Abstract

Tropospheric aerosols are highly variant in time and space due to non-uniform source distribution and strong influence of meteorological conditions. Backscatter lidar measurement is useful to understand vertical distribution of aerosol. However, the backscatter lidar equation is undetermined due to its dependence on the two unknowns, extinction and backscattering coefficient. This dependence necessitates the exact value of the ratio between two parameters, that is, the lidar ratio. Also, Iidar ratio itself is useful optical parameter to understand properties of aerosols. Tropospheric aerosols were observed to understand variance of lidar ratio at Anmyeon island ($36.32^{/circ}N$, $126.19^{/circ}E$), Korea using a multi-wavelength raman lidar system developed by the Advanced Environmental Monitoring Research Center (ADEMRC), Gwangju Institute Science and Technology (GIST), Korea during measurement periods; March 15$\sim$April $16^{th}$, 2004 and May 24$\sim$ $8^{th}$ 2005. Extinction coefficient, backscattering coefficient, and lidar ratio were measured at 355 and 532 nm by the Raman method. Different types of aerosol layers were distinguished by the differences in the optical properties such as Angstrom exponent, and lidar ratio. The average value of lidar ratio during two observation periods was found to be $50.85\pm4.88$ sr at 355 nm and $52.43\pm15.15$ sr at 532 nm at 2004 and $57.94\pm10.29$ sr at 355 nm and $82.24\pm15.90$ sr at 532 nm at 2005. We conduct hysplit back-trajectory to know the pathway of airmass during the observation periods. We also calculate lidar ratio of different type of aerosol, urban, maritime, dust, continental aerosols using OPAC (Optical Properties of Aerosols and Clouds), Remote sensing of atmospheric aerosol using a multi-wavelengh lidar system with Raman channels is quite and powerful tool to characterize the optical propertises of troposheric aerosols.

Keywords

References

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