532/1064 nm ACA lidar measurements of Asian dust at Suwon, Korea during 2002/spl sim/2004

Abstract

Asian dust in the middle and lower troposphere has been measured continuously by ACA lidar at Suwon station (37.2/spl deg/N-127.6/spl deg/E) during 2002-2004. The lidar system consists of 532/1064 nm laser transmitter and multi-receiving channels. The output optical parameters of the lidar are 532/1064 nm backscatters, 532 nm depolarization ratio, and 1064/532 nm color ratio. During three years of intensive observations of the Asian dust, more than 25 episodes were successfully monitored. The significant dust in March 2002 to May 2004 showed the dust layers are located in the altitude range of 0.4-6 km with the depolarization ratios, 10-30%, the backscattering ratio, 1-5, and the aerosol color ratio, 0.3-0.9 respectively. The backward trajectory applied to those episodes showed that the dust mainly came from Mongolia and Takaramakan deserts.