Verification of a Linear Relation between IR Extinction, Absorption and Liquid Water Content of Fogs

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Abstract
A linear relationship, independent of the form of the size-distribution, between extinction at wave-lengths around λ = 11 µm, absorption around λ = 3.8 and 9.5 µm, and liquid water content of atmospheric fogs has been verified using 341 droplet size distribution measurements made under a variety of meteorological conditions. The results suggest that integrated liquid water content along a path in fog can be determined from measurement of CO2 laser (λ = 10.6 µm) transmission along the path, and that liquid water content at a particular point in fog can be inferred from in situ measurement of fog-droplet absorption with a deuterium fluoride laser (λ = 3.8 µm) or a suitably tuned C02 laser (λ = 9.5 µm) spectrophone.

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