Correlation analyses and orthogonal empirical functions were performed with the purpose of obtaining teleconnectivity patterns. The analyses were applied to the model results of a long integration (11 years), initially with the Southern Hemisphere seasonal streamfunction data at 200hPa. Pentadal means were performed to eliminate the high frequency oscillations from the data series and anomalies were obtained, subtracting the climatological pentads from each individual pentad.
The preliminary correlation patterns show significant and seasonally dependent wavetrains representing tropical-extratropical interactions and teleconnections between the high level circulation over Pacific and Atlantic Oceans. Anomalies close to southeast of South America show correlations with anomalies over South Pacific and South Atlantic. Correlation patterns are similar to those found in observational studies, i.e. wavetrains from tropical South Pacific to south of South America and then, northeastward reaching the Tropical South Atlantic. EOF analyses were applied to the model streamfunction data in order to determine the dominant patterns. Filtered data are also used to focus the analyses in the intraseasonal band. The interannual variability is evaluated analysing the time series of EOF amplitudes. Periods of maximum positive and negative principal components are analysed related to outgoing long-wave radiation data to identify the linking between convection and wavetrains on the model results.
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