Significance of transboundary air pollution to Japan during May 2016 - a study using a semi-regional model, a geostationary satellite and in situ measurements
Dr. Daisuke Goto
National Institute for Environmental Studies, Japan
To precisely capture the 4-dimensional structures of aerosol distributions in East Asia, in this study we use both the Advanced Himawari Imager (AHI) onboard the geostationary satellite, Himawari-8, and a semi-regional aerosol-transport model coupled to the non-hydrostatic icosahedral atmospheric model (NICAM) with a high horizontal resolution. One advantage of the AHI is that the imager can estimate the aerosol optical properties with more highly temporal resolution than polar-orbit satellites. We focus on transboundary air pollution, especially aerosols, over Japan and discuss how much the multiple measurements, i.e. column aerosol optical thickness retrieved by AHI, surface PM2.5 concentrations measured by in-situ sampling, and vertical profile of aerosols retrieved from lidar, as well as NICAM capture the transboundary pollution during May 2016. It suggests that the 4-dimensional structures of the transboundary air pollution depend not on the source region and chemical composition, i.e., biomass burning from Siberia or anthropogenic sulfate from the continent, but on the meteorological conditions around Japan.