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한국대기환경학회 한국대기환경학회지(국문) 한국대기환경학회지 제22권 제1호
발행연도
2006.2
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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, lidar 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°N, 126.19°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~April 16th, 2004 and May 24~June 8th, 2005. Extinction coefficient, backscattering coefficient, and lidar ratio were measured at 355 and 532 ㎚ 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±4.88 sr at 355 ㎚ and 52.43±15.15 sr at 532 ㎚ at 2004 and 57.94±10.29 sr at 355 ㎚ and 82.24±15.90 sr at 532 ㎚ 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-wavelength lidar system with Raman channels is quite appropriate and powerful tool to characterize the optical properties of troposheric aerosols.

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UCI(KEPA) : I410-ECN-0101-2009-539-015290298