NOCN03 CWAO 301930
GENOT ADMN NO. 001

AS OF SUNDAY 1 FEBRUARY 2004 THE CANADIAN METEOROLOGICAL CENTRE WILL
USE THE GLOBAL MODEL GEM INSTEAD OF THE GLOBAL SPECTRAL MODEL SEF 
TO PRODUCE THE MONTHLY AND SEASONAL FORECASTS. THE SEF MODEL HAS 
BEEN USED IN OPERATION SINCE 1995. THE VERSION OF THE GEM MODEL THAT 
WILL BE USED HAS A HORIZONTAL RESOLUTION OF 1.875 DEGREES AND 50 
LEVELS IN THE VERTICAL. THIS VERSION OF THE GEM MODEL WAS VALIDATED 
IN HINDCAST MODE OVER THE PERIOD 1969 TO 1994. THE VERIFICATIONS SHOW 
THAT THE GEM MODEL IS GLOBALLY SUPERIOR TO THE SEF MODEL. IT HAS TO 
BE NOTED THAT THE GCM2 MODEL OF THE CANADIAN CENTRE FOR CLIMATE 
MODELLING AND ANALYSIS WILL CONTINUE TO BE USED IN COMBINATION WITH 
THE GEM MODEL TO PRODUCE THE SEASONAL FORECASTS ACCORDING TO A 
MULTI-MODEL ENSEMBLE APPROACH.

A COMPTER DU DIMANCHE 1 FEVRIER 2004  LE CENTRE METEOROLOGIQUE 
CANADIEN UTILISERA LE MODELE GLOBAL GEM POUR EFFECTUER LES 
PREVISIONS MENSUELLES ET SAISONNIERES EN REMPLACEMENT DU MODELE 
GLOBAL SPECTRAL SEF. CE DERNIER MODELE ETAIT  EN EXPLOITATION DEPUIS 
1995. LA VERSION DU MODELE GEM QUI SERA UTILISEE COMPORTE UNE 
RESOLUTION HORIZONTALE DE 1.875 DEGRES ET 50 NIVEAUX DANS LA 
VERTICALE. CETTE VERSION DU MODELE GEM A ETE VALIDEE EN MODE
PREVISION HISTORIQUE SUR LA PERIODE 1969 A 1994. LES VERIFICATIONS
MONTRENT QUE LE MODELE GEM EST GLOBALEMENT SUPERIEUR AU MODELE
SEF. IL EST A NOTER QUE LE MODELE GCM2 DU CENTRE CANADIEN DE LA
MODELISATION ET DE L ANALYSE CLIMATIQUE CONTINUERA D ETRE 
UTILISE EN COMBINAISON AVEC LE MODELE GEM POUR EFFECTUER LES
PREVISIONS SAISONNIERES SELON UNE APPROCHE D ENSEMBLE MULTI
MODELE.

EVERELL / ADMA / SMA-SMC TORONTO