Séminaire vendredi 18 nov 11h00 / Seminar Friday Nov 18th 11h00 

Conférencier/Lecturer: Jiagnan Li
                       CCCMA

        Sujet/Subject: A new radiation algorithm for GCMs

         Presentation: Anglais/English
            Lieu/Room: Grande salle du premier étage CMC 

                 iweb: http://iweb.cmc.ec.gc.ca/rpn/SEM 
                  web: http://collaboration.cmc.ec.gc.ca/science/rpn/SEM/index.php

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                                 RESUME / ABSTRACT 

A new radiation scheme is proposed that uses the correlated
k-distribution (CKD) method. The theoretical background of CKD is
re-investigated and a very accurate method for gaseous transmission is
given. The cloud radiative treatment will be discussed in the talk.
A new approach to cloud overlap is shown and a new radiative transfer
algorithm has been developed to deal with these various cloud overlap
circumstances. It is simple enough for implementation in a climate
model.

This radiation scheme contains many new features, for example,
the spectral overlap between solar and infrared, UVA, UVB, UVC
treatment, unifying the atmospheric model and middle atmospheric model,
etc. These will also be briefly discussed.