Abstract
The extinction coefficient of atmospheric aerosol particles influences the earth's radiation balance directly or indirectly and it can be determined by the scattering and absorption characteristics of aerosol particles. The problem of estimating the change of extinction coefficient due to time evolution of particle size distribution is studied and an improved method for calculating the single particle extinction efficiency is proposed. Through this improved method, the single particle extinction efficiency can be expressed simply in powers of particle diameter based on the anomalous diffraction approximate for the particle size range from 0.1 to 10 µm in diameter first, and then the change of the overall extinction coefficient undergoing (individually and simultaneous) Brownian and gravitational coagulation as well as condensation can be estimated comprehensively with the moment method based on the general dynamic equation. The feasibility and reliability of this method are investigated and the effect of time evolution of particle size distribution on the extinction coefficient is also estimated systemically. Simulation experiments indicate that the extinction coefficient obtained with the improved method coincides fairly well with that using the Mie theory, which provides a simple, dependable, and efficient method to estimate the change of extinction coefficient during the particle dynamic processes.
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