Aerosol Extinction of Photopic and IR Wavelengths. Demonstrated Relationship of Visibility of Atmospheric Liquid Water Suggests that Atmospheric Transmittance for IR can be Estimated by Use of Simple Measurements and Scaling Laws.

摘要

Marine aerosol-size distributions are measured and scaling laws derived to relate the photopic and infrared extinction coefficients for differing visibility conditions. It is shown that simple linear relationships can be derived for this purpose by use of the measured distributions and Mie theory. Linear relationships can also be derived to relate wavelength-dependent extinctions to atmospheric liquid water content. Comparison of extinctions predicted analytically on the basis of accepted fog aerosol models and those numerically derived from measured distributions indicates that the contributions from particles having diameters greater than 30 micrometers may significantly alter the derived scaling laws. (Author)