Tropical Atlantic Contributions to Strong Rainfall Variability Along the Northeast Brazilian Coast

Type Article
Date 2015
Language English
Author(s) Hounsou-Gbo G. A.1, Araujo M.1, Bourles Bernard2, 3, Veleda D.1, Servain J.1, 4
Affiliation(s) 1 : Univ Fed Pernambuco, Dept Oceanog, LOFEC, BR-50740550 Recife, PE, Brazil.
2 : Ctr IRD Bretagne, LEGOS, Inst Rech Dev, F-29280 Plouzane, France.
3 : UAC, UNESCO Chair, ICMPA, Cotonou, Benin.
4 : Univ Paris 06, UMR 7159, IRD CNRS MNHN, LOCEAN, F-75252 Paris 05, France.
Source Advances In Meteorology (1687-9309) (Hindawi Ltd), 2015 , Vol. 2015 , N. 902084 , P. 13p.
DOI 10.1155/2015/902084
WOS© Times Cited 26
Abstract

Tropical Atlantic (TA) Ocean-atmosphere interactions and their contributions to strong variability of rainfall along the Northeast Brazilian (NEB) coast were investigated for the years 1974-2008. The core rainy seasons of March-April and June-July were identified for Fortaleza (northern NEB; NNEB) and Recife (eastern NEB; ENEB), respectively. Lagged linear regressions between sea surface temperature (SST) and pseudo wind stress (PWS) anomalies over the entire TA and strong rainfall anomalies at Fortaleza and Recife show that the rainfall variability of these regions is differentially influenced by the dynamics of the TA. When the Intertropical Convergence Zone is abnormally displaced southward a few months prior to the NNEB rainy season, the associated meridional mode increases humidity and precipitation during the rainy season. Additionally, this study shows predictive effect of SST, meridional PWS, and barrier layer thickness, in the Northwestern equatorial Atlantic, on the NNEB rainfall. The dynamical influence of the TA on the June-July ENEB rainfall variability shows a northwestward-propagating area of strong, positively correlated SST from the southeastern TA to the southwestern Atlantic warm pool (SAWP) offshore of Brazil. Our results also show predictive effect of SST, zonal PWS, and mixed layer depth, in the SAWP, on the ENEB rainfall.

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