Characteristics of dust aerosols inferred from lidar depolarization measurements at two wavelengths

Abstract

Lidar depolarization measurements were performed simultaneously at two wavelengths (532 and $1064\text{\hspace{0.17em} nm}$) in an Asian dust event. The observed particle depolarization ratio for $1064\text{\hspace{0.17em} nm}$ was generally larger than that for $\text{532 \hspace{0.17em} nm}$, and it was found that the mixing of Asian dust and other spherical aerosols must be taken into account. A simple two-component theory considering two types of aerosol (dust and spherical aerosols) was developed and applied to the observed data. The mixing ratio of dust and the backscatter-related Ångström exponents for dust and spherical aerosols was derived. These parameters can be used to infer characteristics of the aerosols and the mixed states.

© 2006 Optical Society of America

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