The role of the subtropical and equatorial forcing in the development of the Atlantic Niños after 1970s.

International audience; Previous works have reported a connection betweeen Atlantic and Pacific Niños occurring since 1970s. Accordingly, an Atlantic Niño (Niña) seems to favor the development of a Pacific la Niña (Niño) next winter, through an alteration of the Walker circulation. These Atlantic Niños occurring since 1970s are characterized by anomalous SSTs covering the entire tropical band during the summer months, which differs from a more equatorial warming pattern observed in previous decades. The development of this striking spatial pattern of the Atlantic Niños after 70s seems to be associated with an alteration of both North and South Subtropical Highs during the previous Winter-sp…