Asian dust measurement with Mie-scattering Lidar at Suwon, Korea in the spring of 2000~2004 (Invited Paper)

Measurement of Asian dust in the troposphere have been performed with Mie scattering lidars that are Multi-wavelength aerosol lidar (MWA lidar) and Automatic Continuous operated lidar (ACA lidar) at Suwon, Korea (37.2N-127.6E) in the spring of 2000-2004. These lidar systems are based on pulsed Nd:YAG and multi-receiving channels. It consists in two or three mode that MWA lidar are 355 and 532 nm backscatters and 532nm depolarization ratio, and ACA lidar are 532 and 1064 nm backscatters, 532 nm depolarization ratio, and 1064/532 nm aerosol color ratio. During five years (2000-2004) of intensive observation of Asian dust more than 56 episodes and 2,177 vertical profiles were successfully measured. The significant dust in March 2002 to May 2003 showed the dust layers are located in the altitude range of 0.2-3 km. In this case, the depolarization ratio is large than 15% and in some case up to 30%. The ratio of backscattering ratio and the aerosol color ratio are in teh range of 1-5 and 0.3-0.9 respectively. To identify the Asian dust, we retrieved the particle size distribution from the signals of 355nm and 532nm of MWA lidar. In the 12:35-12:40, March 21, 2000, the composition percentage of particle square distribution spectrum of small particles at 0.069-0.225 μm are higher value from 12-39%. Also large particles is lower that are about 17-19% at 0.752μm, 7% at 1.301 μm, and 5% at 2.355μm, respectively. The study of backward trajectory carried out in this episode. The results coincide well with the lidar measurement profiles.