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Naser Mohammadzadeh,Myong-In Lee,Ganghan Kim,Seunghee Lee 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
Local air quality in one region is always affected by many factors such as local and transported sources of air pollutions. South Korea as a developed country has faced this issue. Ulsan which is located in the southeast of South Korea is a metropolitan city with a coastal line in the east and huge mountains in the west and also has lots of variations in topography, always suffer from regional and transboundary air pollutions. To analyze the aerosol characteristics over Ulsan, the optical properties of the aerosol layers in the troposphere were observed using a ground-based LIDAR (Light Detection And Ranging) located in the Ulsan National Institute of Science and Technology (UNIST), South Korea (129°E, 35°N) in March 2015-December 2020. In this study we have used two wavelengths (532 nm and 1064 nm) Depolarization channels of L2S-SM II Lidar and Range Corrected Signal (RC) seasonally and diurnally to reveal variation of air quality. The ratio of Depolarization Ratio (DR) between the 1064 nm and the 532 nm dependent on the mixing status of spherical particle and dust article. For ground observation we used 13 years air quality data. The atmospheric boundary layer height (ABLH) was mainly at an altitude of 1km. The depolarization ratio and range corrected signal was higher in spring-winter than in summer-autumn, which means that we have a huge amount of mineral dust in these times. We found that most of the high range of the depolarization ratio is almost focused on later in the morning to earlier in the night.