Synergetic analysis of springtime air pollution episodes over Gwangju,Korea

• Published in: Journal of environmental sciences (China) 2017-07, Vol.57 (7), p.270-283
• Main Authors: Shin, Sung-Kyun, Lee, Kwon-Ho, Park, Seung-Shik, Wong, Man Sing
• Format: Article
• Language: English
• Subjects: Aerosol optical depth; Air Pollutants - analysis; Air Pollution - statistics & numerical data; Atmosphere - chemistry; Environmental Monitoring; LIDAR; MODIS; Optical/microphysical properties; Republic of Korea; Seasons; Sun/sky radiometer; Weather; 低浓度; 协同分析; 均方根偏差; 气溶胶光学厚度; 污染事件; 空气; 韩国
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2017.02.002

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 sea level.Anthropogenic/smoke particles that originated from highly populated/industrialized regions could be distinguished by their relatively smaller particle size（？_（440–870） ranged between1.33 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 PM10 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.