Long-Term Variation of Aerosol Optical Properties Associated with Aerosol Types Over East Asia Using Aeronet and Satellite (Viirs, Omi) Data

Abstract

We analyzed annual and seasonal frequency in aerosol type over an 8-year period (2012–2019) to identify aerosol parameter trends over four ground sites and country regions in Korea, China, and Japan by using the Aerosol Robotic Network (AERONET), and the satellite-based Visible Infrared Imaging Radiometer Suite (VIIRS) and Ozone Monitoring Instrument (OMI). Several aerosol classification methods were modified for use in this analysis. The trend results showed decreasing trends in aerosol optical depth (AOD), Ångström exponent (AE), and fine mode fraction (FMF) in all countries from satellite and ground observation. For the aerosol type frequency, decreases in the proportions of carbonaceous aerosols (CA) and non-absorbing (NA) aerosols were detected in the ground and satellite data, respectively, as the proportion of ‘‘LOW’’ aerosol type increased. Changes in aerosol type and properties were observed concurrently in all ground and satellite data over this time interval.

Keywords: AERONET, AOD, Aerosol type classification, OMI, VIIRS