The 2003/2004 austral summer was very wet in the central portions of Brazil (Southeast and Central-West Regions, and southern Northeast). During this period there were five episodes of South Atlantic Convergence Zone (SACZ). This study explores the atmospheric variability during such SACZ episodes. Daily data from GDAS and daily interpolated OLR were used in the analysis. Results from filtered data and wavelet analysis show that the convection associated with the SACZ was highly modulated by intraseasonal waves that reached South America from Pacific Ocean. Shorter than the Madden Julian intraseasonal oscillation, periods of 14 and 9 days were also obtained during the season. The qualitative relationship between the influence of frontal systems reaching the region and the intraseasonal oscillation on the SACZ activity and maintenance is also explored.Pages: 1009-101
