Leipzig 2002 – scientific programme

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UP: Umweltphysik

UP 11: Datenauswertung und Modellierung (Atmosphäre) - Poster

UP 11.9: Poster

Monday, March 18, 2002, 16:30–18:00, Galerie 1

Using a new Radiative Transfer Model to estimate the Effect of Cirrus Clouds on AMSU-B Radiances. — •Sreerekha Ravindranathan Thonipparambil, Stefan Buehler, and Claudia Emde — Institute of Environmental Physics University of Bremen /FB 1 PO Box 330440,28334 Bremen,Germany

The up-welling atmospheric radiation in the mm-wave spectral range is influenced by the presence of cirrus clouds. A plane parallel radiative transfer model which can take into account the effect of multiple-scattering of ice particles in the cirrus has been developed and is used to simulate the brightness temperature for the AMSU-B channels. The model uses an iterative procedure to solve the radiative transfer equation. The formulation of the model is such, that it can easily be adapted to treat the full Stokes vector instead of just the scalar total intensity. This will allow the investigation of polarization effects by oriented non-spherical ice particles. The paper/poster presents the model and demonstrates how it is tested for convergence. Furthermore, different cirrus cloud scenarios are studied and the results are presented. The results confirm that the brightness temperature in this frequency range is greatly influenced by the cloud’s microphysical properties.