Aerosol size distributions obtained by inversion of spectral optical depth measurements

Details Aerosol size distributions obtained by inversion of spectral optical depth measurements Aerosol size distributions obtained by inversion of spectral optical depth measurements

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jats...35.2153k&link_type=abstract

Journal of the Atmospheric Sciences, vol. 35, Nov. 1978, p. 2153-2167.

Statistics

100

Aerosols, Air Pollution, Depth Measurement, Optical Thickness, Particle Size Distribution, Atmospheric Attenuation, Atmospheric Diffusion, Light Transmission, Refractivity, Statistical Distributions, Variance (Statistics)

Scientific paper

Columnar aerosol size distributions have been inferred by numerically inverting particulate optical depth measurements as a function of wavelength. An inversion formula which explicitly includes the magnitude of the measurement variances is derived and applied to optical depth measurements obtained in Tucson with a solar radiometer. It is found that the individual size distributions of the aerosol particles (assumed spherical), at least for radii greater than or approximately equal to 0.1 micron, fall into one of three distinctly different categories. Approximately 50% of all distributions examined thus far can best be represented as a composite of a Junge distribution plus a distribution of relatively monodispersed larger particles centered at a radius of about 0.5 micron. Scarcely 20% of the distributions yielded Junge size distributions, while 30% yielded relatively monodispersed distributions of the log-normal or gamma distribution types. A representative selection of each of these types will be presented and discussed. The sensitivity of spectral attenuation measurements to the radii limits and refractive index assumed in the numerical inversion will also be addressed.

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