Abstract

Atmospheric spectral attenuation coefficients have been measured in ten narrow wavelength bands between 0.4 and 2.3 μ for a variety of weather conditions for two overwater, sea-level paths of 5.5 and 16.3 km. The wavelength bands were chosen so as to avoid molecular absorption and were isolated by interference filters. A 60-in.-diameter high-intensity source and a 24-in.-diameter narrow-field receiver were combined to yield relative scattering attenuation coefficients (σ) as a function of wavelength λ. These were then scaled using values obtained at one wavelength with a visual telephotometer. Logσ vs logλ curves show a wide range of slopes and shapes, with a tendency toward less slope in the infrared (indicating that σ is becoming independent of λ in the infrared). Some correlation with relative humidity was found for relative humidities greater than 70%. An anomalous slope reversal between 1.68 and 2.27 μ is discussed, and a possible explanation for the reversal is given as selective scattering by the aerosol at these wavelengths.

© 1962 Optical Society of America

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