It is known that the aerosol distribution in Asia is complicated due to the increasing emissions of anthropogenic aerosols
in association with economic growth and natural dust significantly varied with the seasons. Therefore it is clear that local
spatially and temporally resolved measurements of atmospheric aerosols in Asian urban city are necessary. Since Osaka,
Kobe, Kyoto, and Nara are located in very close each others (all cities are included in around 70×70 km2 area). The
population of the region is around 13 millions including neighbor prefectures, accordingly air quality in this region is
slightly bad in comparison with the remote area. Furthermore, in recent years, Asian dusts and anthropogenic small
particles some times transported from China and cover these cities throughout year.
DRAGON (Distributed Regional Aerosol Gridded Observation Network) is a project of dense sun/sky radiometer
network in the urban area. The DRAGON-West Japan field campaign was performed over Osaka and neighbor cities
with 7 AERONET instruments from March to end of May in 2012. As results, DRAGON measurements indicate small
differences among the values of AOT over Osaka region.
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