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Variability of the Phase Function of Atmospheric Aerosols at Large Scattering Angles

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  • 1 Earth Observation Research Center, NASDA, Tokyo, Japan
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Abstract

The variability of phase functions of submicrometer atmospheric aerosols was studied using Mie theory. In the analyzed statistical ensemble of phase functions, the effective radii of particles were 0.1–1.5 μm, real parts of refractive indices were 1.45–1.6, imaginary parts of refractive indices were 0.001–0.01, and coefficients of variance of particle size distributions were 0.2–1.1. An ensemble average, a coefficient of variance of a phase function, and a skewness were calculated.

It was found that the coefficient of variance of a phase function has a minimum near a scattering angle of 150°. This fact was used to estimate the error in the aerosol optical thickness determination from space in the single scattering approximation of the radiative transfer theory.

* Current affiliation: Institute of Physics, Minsk, Belarus.

Corresponding author address: Dr. A. A. Kokhanovsky, Institute of Physics, 70 Skarina Ave., Minsk 220070 Belarus.

Email: a.kokhanovsky@ieee.org

Abstract

The variability of phase functions of submicrometer atmospheric aerosols was studied using Mie theory. In the analyzed statistical ensemble of phase functions, the effective radii of particles were 0.1–1.5 μm, real parts of refractive indices were 1.45–1.6, imaginary parts of refractive indices were 0.001–0.01, and coefficients of variance of particle size distributions were 0.2–1.1. An ensemble average, a coefficient of variance of a phase function, and a skewness were calculated.

It was found that the coefficient of variance of a phase function has a minimum near a scattering angle of 150°. This fact was used to estimate the error in the aerosol optical thickness determination from space in the single scattering approximation of the radiative transfer theory.

* Current affiliation: Institute of Physics, Minsk, Belarus.

Corresponding author address: Dr. A. A. Kokhanovsky, Institute of Physics, 70 Skarina Ave., Minsk 220070 Belarus.

Email: a.kokhanovsky@ieee.org

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