Synergetic analysis of springtime air pollution episodes over Gwangju, Korea
Sung-Kyun Shin , Kwon-Ho Lee , Seung-Shik Park , Man Sing Wong
DOI:10.1016/j.jes.2017.02.002
Received October 20, 2016,Revised January 03, 2017, Accepted February 05, 2017, Available online February 13, 2017
Volume 29,2017,Pages 270-283
The characteristics of springtime aerosols, including their optical and microphysical properties, were analyzed for the months of March to May of 2009 in Gwangju (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 ?ngstr?m exponent values of the 440–870 nm wavelength pair (? 440–870 ) and single-scattering albedo at 675 nm (Ω 675 ) 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 sealevel. Anthropogenic/smoke particles that originated from highly populated/industrialized regions could be distinguished by their relatively smaller particle size (? 440–870 ranged between 1.33 and 1.36) and higher light-absorbing (Ω 675 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 (τ LIDAR ) and from the CIMEL sun/sky radiometer (τ CIMEL ) varied with respect to the surface PM 10 concentration. The RMSD between τ LIDAR and τ CIMEL was as low as 13% under lower PM 10 concentration levels (<100 μg/m 3 ). In contrast, the RMSD between τ LIDAR and τ CIMEL increased three times (~31%) under high surface PM 10 concentration levels (>100 μg/m 3 ). These results suggest that the accuracy of τ LIDAR is
influenced by specific atmospheric conditions, regardless of its uncertainty.
