Title: Total scatter-to-backscatter ratio of aerosol derived from aerosol size distribution measurement

Authors: Wei-Nai Chen, Shih-Yu Chang, Charles C-K. Chou, Guor-Cheng Fang

Addresses: Research Center for Environmental Changes, Academia Sinica, Nankang, Taipei 115, Taiwan. ' Research Center for Environmental Changes, Academia Sinica, Nankang, Taipei 115, Taiwan. ' Research Center for Environmental Changes, Academia Sinica, Nankang, Taipei 115, Taiwan. ' Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan

Abstract: 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.

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.

DOI: 10.1504/IJEP.2009.024470

International Journal of Environment and Pollution, 2009 Vol.37 No.1, pp.45 - 54

Published online: 06 Apr 2009 *

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