8 August 1989 Seasonal And Diurnal Changes In Cloud Obscurations To Visible And Infrared Energy Transmission
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Abstract
Statistics on cloud cover and the attenuation of radiation by clouds are being compiled from satellite and lidar data. The multispectral data from the GOES/VAS satellite allow the definition of cloud altitudes and infrared emissivities. Thin transmissive cirrus clouds can be detected with this technique which have been mis-identified in other studies as low altitude clouds or completely undetected because of the complications of underlying clouds or land backgrounds. A summary of cloud cover statistics over the last two years is presented in Section 3. The cloud infrared emissivity derived by this technique is a measure of the attenuation of infrared radiation by the clouds. It has been theoretically related to the total vertical optical thickness in the visible spectrum by Hansen l. This relationship is predicted using a multiple scattering model of cirrus cloud sized particles. With this relationship we plan to convert our cloud emissivity data to optical thickness estimates so that radiative attenuation estimates can be made in both the visible and infrared parts of the spectrum. We are in the process of verifying the relationship using lidar and satellite data. The first results of this verification study are shown in Section 4.
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Donald Wylie, Donald Wylie, Chris Grund, Chris Grund, Edwin Eloranta, Edwin Eloranta, } "Seasonal And Diurnal Changes In Cloud Obscurations To Visible And Infrared Energy Transmission", Proc. SPIE 1060, Nonlinear Optical Beam Manipulation and High Energy Beam Propagation Through the Atmosphere, (8 August 1989); doi: 10.1117/12.951745; https://doi.org/10.1117/12.951745
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