Relationship of Aerosol Optical Properties and Aerosol Types over East Asia from Ground and Satellite Observations

From the 8-year observation data over East Asia, the seasonal and annual frequencies of aerosol types are analyzed with related to the aerosol optical properties. For the aerosol type identification, the remote sensing datasets from ground-based (Aerosol Robotic Network; AERONET) and satellite-based (Visible Infrared Imaging Radiometer Suite; VIIRS and Ozone Monitoring Instrument ;OMI) measurements are used. During the analyzed period, the decreasing trends in aerosol optical depth (AOD), Ångström exponent (AE), and fine mode fraction (FMF) are found in all countries from satellite and ground observation. In addition, decreases in the proportions of carbonaceous aerosols (CA) and non-absorbing (NA) aerosols were detected in the ground and satellite data, respectively. Changes in aerosol type and properties were observed concurrently in all ground and satellite data over this time interval. In addition, in-situ data (PM2.5 recons of SPARTAN sampling station) of Yonsei_University was additionally used and analyzed together with the aerosol type analysis results of this study.