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Decadal (9–14 year) relations of the northern northeastern Brazil (NEB) rainfall to the sea surface temperature (SST) in the 60°N–30°S oceanic sector and to the global sea level pressure (SLP) anomalies are investigated for the 1871–1991 period. Indices are defined for the precipitation and for the SST anomalies in the tropical North Atlantic (TNA), in the tropical South Atlantic (TSA), and in the eastern equatorial Pacific (T‐TNA, T‐TSA, and T‐NINO indices, respectively). An index is also defined for the SLP anomalies in the North Atlantic Oscillation region (P‐NAO index). These indices and the SST and SLP anomaly time series are filtered for the decadal scale using the continuous wavelet transform. The filtered time series are then subjected to the correlation and partial correlation analyses. The results indicate that the decadal variations of the northern NEB rainfall might be independently linked to the Pacific Decadal Oscillation (PDO)/NAO/TNA decadal relations or to the SST decadal variations in the TSA. This is a new result not discussed before. The northern NEB rainfall linkage to the PDO/NAO/TNA relations is indicative that the relationship of the SLP variations in the NAO region and the NEB rainfall proposed in a work during the 1970s is part of the decadal climate variability that connects the PDO in the tropical Pacific to the NEB rainfall through the Northern Hemisphere extratropical atmosphere.
Kayano et al. (Mon,) studied this question.