Keywords: aerosol size distribution measurements, Mie scattering theory, scattering coefficients, backscattering coefficients, lidar ratio, effective radius, particle size distribution, SMPS, APS, nephelometer, light scattering, aerosols, Taiwan, scanning mobility particle sizer, aerodynamic particle sizer
Total scatter-to-backscatter ratio of aerosol derived from aerosol size distribution measurement
Based on in-situ aerosol size-distribution measurements and Mie scattering theory, total scattering coefficients and backscattering coefficients were calculated to derived wavelength dependent lidar ratio S for 355 nm and 532 nm. Effective radius and C/F ratio of aerosol are also calculated to study the relationships between lidar ratio and particle size dependences. The results show backscatter-related scattering properties are more sensitive to coarse mode particle than total scattering. The mean values of lidar ratio for 355 nm and 532 nm are 31.9 ± 6.2 sr and 40.5 ± 6.1 sr respectively, and S355 and S532 are linear correlated for S355 < 50 sr. S355 is highly correlated with effective radius of aerosol, and S532 is highly correlated with volume C/F ratio.