Abstract

An iterative nonlinear inversion algorithm is applied to measured extinction coefficients at wavelengths from 0.4 to 0.8 μm. The retrieved distributions are then compared with mass size distributions sampled with an AERAS low-pressure cascade impactor with lower cut and uppercut sizes of 0.1- and 12.8-μm aerodynamic equivalent diam. It is found that the accumulation mode can be retrieved very well in the size range from 0.06- to 1-μm radius and diurnal variations of the accumulation mode with relative humidity can be resolved. Below 0.06- and above 1-μm radius retrieved size distributions strongly resemble the first-guess solution since in these size ranges the degree of dependence of the kernels is very high for the wavelength range under consideration. As the retrieval algorithm has proved to be stable, the physical value of the retrieved solution depends strongly on the quality of the extinction data.

© 1986 Optical Society of America

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