Characterization of aerosols in Saga city areas in Japan with direct and diffuse solar irradiance and aureole observations

By using Sky Radiometer which allows measuring direct and diffuse solar irradiance as well as aureole, aerosol properties of aerosol particles in Saga, Japan is characterized. Results indicate that aerosol density, optical depth, single scattering albedo, asymmetric factor in the morning and evening are larger than those in the day time around noon, and they are also larger in summer than those in the other seasons. The changes of the aerosol density, optical depth, are the largest in summer and are the smallest in winter during the four seasons. It is also found that the changes of the aerosol size distribution and optical depth are larger in the morning and the evening than those in day time around noon.