Imaginary refractive-index effects on desert-aerosol extinction versus backscatter relationships at 351 nm: numerical computations and comparison with Raman lidar measurements

Abstract

A numerical model is used to investigate the dependence at 351 nm of desert-aerosol extinction and backscatter coefficients on particle imaginary refractive index (m _i). Three ranges (-0.005 ≤ m _i ≤ -0.001, -0.01 ≤ m _i ≤ -0.001, and -0.02 ≤ m _i ≤ -0.001) are considered, showing that backscatter coefficients are reduced as |m _i| increases, whereas extinction coefficients are weakly dependent on m _i. Numerical results are compared with extinction and backscatter coefficients retrieved by elastic Raman lidar measurements performed during Saharan dust storms over the Mediterranean Sea. The comparison indicates that a range of -0.01 to -0.001 can be representative of Saharan dust aerosols and that the nonsphericity of mineral particles must be considered.

© 2004 Optical Society of America

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