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The characteristics of springtime aerosols,including their optical and microphysical properties,were analyzed for the months of March to May of 2009 in Gwangiu (35.23°N,126.84°E),Korea.A high Light Detection and Ranging (LIDAR)-derived aerosol depolarization ratio (δ) of 0.25 ± 0.04 was determined on dust particles during the observation period.The (A)ngstr(o)m exponent values of the 440-870 nm wavelength pair (A440-870) and single-scattering albedo at 675 nm (Ω675) measured by a CIMEL sun/sky radiometer were 0.77 ± 0.19 and 0.95 ± 0.01,respectively.The elevated dust layers reached a maximum elevation of 4 km above sea level.Anthropogenic/smoke particles that originated from highly populated/industrialized regions could be distinguished by their relatively smaller particle size ((A)440-870 ranged between 1.33 and 1.36) and higher light-absorbing (Ω675 of 0.92 ± 0.01) characteristics.These aerosols are mostly distributed at altitudes ＜ 1.2 km.The root-mean-square deviation (RMSD) between the aerosol optical depth (AOD,τ) derived from LIDAR (τLIDAR) and from the CIMEL sun/sky radiometer (τCIMEL) varied with respect to the surface PM1o concentration.The RMSD between τLIDAR and τCMEL was as low as 13％ under lower PM1o concentration levels (＜100 μg/m3).In contrast,the RMSD between TLnDAR and TCIMEL increased three times (～ 31％) under high surface PM1o concentration levels (＞ 100 μg/m3).These results suggest that the accuracy of TLIDAR is influenced by specific atmosphetic conditions,regardless of its uncertaintv.