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Title: Synergetic analysis of springtime air pollution episodes over Gwangju, Korea
Authors: Shin, SK
Lee, KH
Park, SS
Wong, MS 
Issue Date: Jul-2017
Source: Journal of environmental sciences, July 2017, v. 57, p. 270-283
Abstract: 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 degrees N, 126.84 degrees E), Korea. A high Light Detection and Ranging (LIDAR)-derived aerosol depolarization ratio (6) of 0.25 +/- 0.04 was determined on dust particles during the observation period. The Angstrom exponent values of the 440-870 nm wavelength pair (angstrom(440-870)) and single-scattering albedo at 675 nm (0675) 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 (angstrom(440-870) ranged between 1.33 and 1.36) and higher light -absorbing (Omega(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, tau) derived from LIDAR (TuDAR) and from the tau(CIMEL) sun/sky radiometer (tau(CIMEL)) varied with respect to the surface PM10 concentration. The RMSD between tau(LIDAR) and tau(CIMEL) was as low as 13% under lower PM10 concentration levels (<100 Rg/m(3)). In contrast, the RMSD between tau(LIDAR) and tau(CIMEL) increased three times (similar to 31%) under high surface IDMio concentration levels (>100 g/m(3)). These results suggest that the accuracy of tau(LIDAR) is influenced by specific atmospheric conditions, regardless of its uncertainty.
Keywords: LIDAR
Sun/sky radiometer
MODIS
Optical/microphysical properties
Aerosol optical depth
Publisher: Elsevier
Journal: Journal of environmental sciences 
ISSN: 1001-0742
EISSN: 1878-7320
DOI: 10.1016/j.jes.2017.02.002
Rights: © 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
The following publication Shin, S. K., Lee, K. H., Park, S. S., & Wong, M. S. (2017). Synergetic analysis of springtime air pollution episodes over Gwangju, Korea. Journal of Environmental Sciences, 57, 270-283 is available at https://doi.org/10.1016/j.jes.2017.02.002
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