14 December 1998 Effect of water and ice clouds in the outgoing long-wave radiation
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The far-IR spectral region is very important in the Earth Radiation Budget for the considerable cooling of the atmosphere by the strong rotational band of the water vapor. This effect can be modulated by the presence of cirrus clouds. The heating rate in cloudy conditions have been examined using a two stream approximation with a new parameterization of ice and water optical properties, which accounts also for the scattering effects of the ice particles. In the spectral region from 100-1000 cm-1 cirrus clouds act as a heating source which affect the layers in which they are located. The behavior changes when they are completely opaque. The largest signature in the Heating Rate is fond in 400-600 cm-1 and in the atmospheric window. There is a moderate heating/cooling effect in layers close to the clouds: the general picture is a warming below the cloud and a cooling above.
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Francesca Di Giuseppe, Francesca Di Giuseppe, Rolando Rizzi, Rolando Rizzi, Laura Mannozzi, Laura Mannozzi, "Effect of water and ice clouds in the outgoing long-wave radiation", Proc. SPIE 3495, Satellite Remote Sensing of Clouds and the Atmosphere III, (14 December 1998); doi: 10.1117/12.332672; https://doi.org/10.1117/12.332672

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