Data assimilation data assimilation Kalman filter Parameter estimation atmospheric general circulation model ensemble forecasting numerical model Errors Optimization error analysis optimization weather forecasting Atmospheric general circulation models BUSINESS ENGLISH Bias COMUNICACI�ON ORAL Climate models Colombia ELISA ENGLISH LANGUAGE Earth atmosphere Ensemble Kalman filter Ensemble based data assimilation Ensemble kalman filter Error covariance Forecasting INGL�ES T�ECNICO Information measures Information theory Jensen-Shannon divergence