%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Gorenstein, I.
%A Wainer, I.
%A Pausata, F. S. R.
%A Prado, L. F.
%A Khodri, Myriam
%A Dias, P. L. S.
%T A 50-year cycle of sea surface temperature regulates decadal precipitation in the tropical and South Atlantic region
%D 2023
%L fdi:010088712
%G ENG
%J Communications Earth and Environment
%K ATLANTIQUE ; AFRIQUE DE L'OUEST ; AMERIQUE DU SUD ; BRESIL ; ZONE TROPICALE
%M ISI:001109496600001
%N 1
%P 427 [11 ]
%R 10.1038/s43247-023-01073-0
%U https://www.documentation.ird.fr/hor/fdi:010088712
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2024-01/010088712.pdf
%V 4
%W Horizon (IRD)
%X Northeast Brazil and Western Africa are two regions geographically separated by the Atlantic Ocean, both home to vulnerable populations living in semi-arid areas. Atlantic Ocean modes of variability and their interactions with the atmosphere are the main drivers of decadal precipitation in these Atlantic Ocean coastal areas. How these low-frequency modes of variability evolve and interact with each other is key to understanding and predicting decadal precipitation. Here we use the Self-Organizing Maps neural network with different variables to unravel causality between the Atlantic modes of variability and their interactions with the atmosphere. Our study finds an 82% (p<0.05) anti-correlation between decadal rainfall in Northeast Brazil and Western Africa from 1979 to 2005. We also find three multi-decadal cycles: 1870-1920, 1920-1970, and 1970-2019 (satellite era), pointing to a 50-year periodicity governing the sea surface temperature anomalies of Tropical and South Atlantic. Our results demonstrate how Northeast Brazil and Western Africa rainfall anti-correlation was formed in the satellite era and how it might be part of a 50-year cycle from the Tropical and South Atlantic decadal variability.
%$ 021 ; 032