Abstract

The aerosol optical properties such as depolarization ratio (δ) and aerosol extinction-to-backscatter ratios (S, LIDAR ratio) and Ångström exponent (Å) derived from measurement with AERONET sun/sky radiometer at Gangneung-Wonju National University (GWNU), Gangneung, Korea (37.77°N, 128.87°E) during a winter season (December 2014 - February 2015) are presented. The PM concentration measurements are conducted simultaneously and used to identify the high-PM events. The observation period was divided into three cases according to the PM concentrations. We analysed the δ, S, and Å during these high PM-events. These aerosol optical properties are calculated by the sun/sky radiometer data and used to classify a type of aerosols (e.g., dust, anthropogenic pollution). The higher values of δ with lower values of S and Å were measured for the dust particles. The mean values of δ, S, and Å at 440-870 nm wavelength pair (Å_440-870) for the Asia dust were 0.19-0.24, 36-56 sr, and 0.48, respectively. The anthropogenic aerosol plumes are distinguished with the lower values of δ and higher values of Å. The mean values of spectral δ and Å_440-870 for this case varied 0.06-0.16 and 1.33-1.39, respectively. We found that aerosol columnar optical properties obtained from the sun/sky radiometer measurement are useful to identify the aerosol type. Moreover, the columnar aerosol optical properties calculated based on sun/sky radiometer measurements such as δ, S, and Å will be further used for the validation of aerosol parameters obtained from LIDAR observation as well as for quantification of the air quality.

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