MEASURED EFFECTIVE LONG-WAVE EMISSIVITY OF CLOUDS

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  • 1 U.S. Weather Bureau, The University of Wisconsin, Madison, Wis.
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Abstract

Measurements of the effective long-wave emissivity of clouds, equivalent to one minus the slab transmissivity, are obtained through thermal energy relations at cloud tops and bases after the manner of Gergen. Radiometric measurements are employed. Aircraft-verified cloud heights and measured effective cloud emissivities provide a basis for determining the presence of middle and high clouds. Such clouds result in large changes in radiation flux and apparent earth temperature measurements from satellites and high level balloons.

Abstract

Measurements of the effective long-wave emissivity of clouds, equivalent to one minus the slab transmissivity, are obtained through thermal energy relations at cloud tops and bases after the manner of Gergen. Radiometric measurements are employed. Aircraft-verified cloud heights and measured effective cloud emissivities provide a basis for determining the presence of middle and high clouds. Such clouds result in large changes in radiation flux and apparent earth temperature measurements from satellites and high level balloons.

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