Relationship between daily atmospheric circulation patterns and South Atlantic Convergence Zone (SACZ) events

This study presents the daily atmospheric circulation patterns at surface and altitude related to South Atlantic Convergence Zone (SACZ) events that occurred between 2007 2017. For this analysis, Principal Pattern Sequence Analysis (PPSA) sea level pressure geopotential height reanalysis were used. Four typical associated with SACZ episodes identified. Three of them are propagation a cold front toward southeastern Brazil post-frontal anticyclone moving over Ocean. The fourth pattern is presence cut-off low centered central-south region induces moisture transport from Ocean Amazon basin most Brazil. Considering first three patterns, they represent, respectively, frontal wave, classical front, slow-moving front. All these provide permanent northwesterly winds in lower troposphere two days before occurrence.