Monitoring Intraseasonal Variability (IV) and its influence over South America requires an appropriate investigation of the correct representation of IV in climate simulations. Preliminary analysis of the CPTEC/COLA AGCM simulations indicated that this model captures the main modes of IV that affect South America. In the present study a comparison between observed and simulated 30-90 days filtered Outgoing Longwave Radiation (OLR) anomalies was performed for the 1981-2001 summer season. Similar climatological and variance fields characteristics were identified in both data sets, although with different intensities. Some OLR IV characteristics, representing convection variability were well represented by the CPTEC/COLA AGCM. The typical MJO observed pattern in the tropical region is not properly represented by the model, although an alternate OLR anomaly pattern is seen over Indonesia and Pacific Ocean. However the IV patterns, such as the convection dipole associated with the South Atlantic Convergence Zone, are well simulated when the analysis is performed only over South America.
Intraseasonal Variability; South America convection; Climate Simulation; AGCM
