Atmospheric radiative transfer in multiple scattering conditions. Application to NWP models.

Bozzo, Alessio (2009) Atmospheric radiative transfer in multiple scattering conditions. Application to NWP models., [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Modellistica fisica per la protezione dell'ambiente, 21 Ciclo.
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Abstract

High spectral resolution radiative transfer (RT) codes are essential tools in the study of the radiative energy transfer in the Earth atmosphere and a support for the development of parameterizations for fast RT codes used in climate and weather prediction models. Cirrus clouds cover permanently 30% of the Earth's surface, representing an important contribution to the Earth-atmosphere radiation balance. The work has been focussed on the development of the RT model LBLMS. The model, widely tested in the infra-red spectral range, has been extended to the short wave spectrum and it has been used in comparison with airborne and satellite measurements to study the optical properties of cirrus clouds. A new database of single scattering properties has been developed for mid latitude cirrus clouds. Ice clouds are treated as a mixture of ice crystals with various habits. The optical properties of the mixture are tested in comparison to radiometric measurements in selected case studies. Finally, a parameterization of the mixture for application to weather prediction and global circulation models has been developed. The bulk optical properties of ice crystals are parameterized as functions of the effective dimension of measured particle size distributions that are representative of mid latitude cirrus clouds. Tests with the Limited Area Weather Prediction model COSMO have shown the impact of the new parameterization with respect to cirrus cloud optical properties based on ice spheres.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Bozzo, Alessio
Supervisore
Dottorato di ricerca
Scuola di dottorato
Scienze della terra e dell'ambiente
Ciclo
21
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
radiative transfer, cirrus clouds, multiple scattering, weather prediction models
URN:NBN
Data di discussione
11 Giugno 2009
URI

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