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Aerosolmass concentrations are affected by local emissions as well aslong-range transboundary (LRT) aerosols. This work investigates regional andlocal variations of aerosols based on Distributed Regional Aerosol GriddedObservation Networks (DRAGON). We constructed DRAGON-Japan and DRAGON-Osaka inspring of 2012. The former network covers almost all of Japan in order toobtain aerosol information in regional scale over Japanese islands. It wasdetermined from the DRAGON-Japan campaign that the values of aerosol opticalthickness (AOT) decrease from west to east during an aerosol episode. Infact, the highest AOT was recorded at Fukue Island at the western end of thenetwork, and the value was much higher than that of urban areas. The latternetwork (DRAGON-Osaka) was set as a dense instrument network in themegalopolis of Osaka, with a population of 12 million, to better understandlocal aerosol dynamics in urban areas.  AOT was further measured with a mobile sun photometer attached to a car. Thistransect information showed that aerosol concentrations rapidly changed intime and space together when most of the Osaka area was covered with moderateLRT aerosols. The combined use of the dense instrument network (DRAGON-Osaka)and high-frequency measurements provides the motion of aerosol advection,which coincides with the wind vector around the layer between 700 and 850 hPaas provided by the reanalysis data of the National Centers for EnvironmentalPrediction (NCEP)

atmospheric chemistry and physics

Regional and local variations in atmospheric aerosols using ground-based sun photometry during Distributed Regional Aerosol Gridded Observation Networks (DRAGON) in 2012