Study on the Angle and Wavelength Dependent Scattering Signals Characteristics according to the Total Aerosol Mass Concentration Changes

To investigate the relationship between the scattering coefficient and the total amount of suspended aerosol particles in the air, a measurement chamber that can measure scattering signals dependent on angle and wavelength was constructed, and its scattering characteristics were analyzed. Generally, it is known that there is no correlation between the total amount of aerosol and its size because the total amount of aerosol is physically independent of the aerosol physicalchemical characteristics. However, we found that the total scattering intensity and the forward and backward scattering signal ratio were inversely proportional. To verify this, we analyzed the relationship between the ratio of the scattered signals introduced by the two wavelengths and the total scattered signal. The ratio of the total amount of suspended particles and the scattered signal by the two different wavelengths also yielded similar results. We also analyzed extinction coefficients at three wavelengths and their & ANGS;ngstrom exponent (AE) for several months of observation. The result indicated that the larger the extinction coefficient, the smaller the AE value. By calculating the scattering phase function for various aerosol distribution parameters, we suggested the change of total mass might be derived from that of fine aerosol sizes.