A study on the long-range transport of atmospheric fine particles in the Circum-Pan-Japan-Sea area is very important for recent environmental protection policies. We developed a new model of source apportionment of fine particles and trace elements, based on the Chemical Mass Balance (CMB) method and tried to evaluate the quantitative contribution of transported particles to the SPM and elemental concentration at a receptor site. This model, named Source-Transformation CMB method, consists of transforming the source profile, X_ij, of CMB method into atmospheric source aerosol profile, Z_ij. Results of this application to the data set of Matsue, Japan in winter indicated the possible influence of Korean urban aerosol and China desert soil dust on the air quality of Matsue.

View full abstract

Light scattering by small fiber was investigated experimentally and numerically by varying the refractive index or radius of fiber. The fiber used was made of silica glass and coated with polycarbonate film. An Ar-Kr gas laser was used as light source. The intensity of scattered light was measured by a spectroscope with a multichannel photodiode detector. The intensities of light scattered from stratified fiber or unstratified one were measured with changing scattering angle and wavelength. The experimental results agreed with theoretical estimation.

View full abstract

The size distributions of suspended small particles were.determined from the extinction spectra or the irradiance data of sun light. For the estimation of the size distribution, the singular value decomposition (SVD) was used. We used three kinds of mixture of polystyrene latex for the examination. The model distribution of latex particles were retrieved very well. From the light extinction spectrum by aerosol in the atmosphere, we could obtain the size distribution of Junge type.

View full abstract

An equation of deposition of aerosol particles onto the wall of a horizontal pipe for aerosol sampling was derived by applying the same assumptions on a free flight model of a particle and an effective turbulent diffusivity as for a vertical pipe. A correction factor for the gap between eddy motion of fluid and particle motion within the turbulent core was introduced, and more reasonable application of Reynolds analogy to the particle motion in the turbulent core was maintained. The theoretical values by the derived equation agree well with experimental ones in references.

View full abstract