Espinoza J. C. auteur aut IRD Marengo J. A. auteur aut IRD Ronchail J. auteur aut IRD Carpio J. M. auteur aut IRD Flores L. N. auteur aut IRD Guyot Jean-Loup auteur aut IRD text journalArticle eng text/pdf reformatted digital access Unprecedented wet conditions are reported in the 2014 summer (December-March) in Southwestern Amazon, with rainfall about 100% above normal. Discharge in the Madeira River (the main southern Amazon tributary) has been 74% higher than normal (58 000 m(3) s(-1)) at Porto Velho and 380% (25 000 m(3) s(-1)) at Rurrenabaque, at the exit of the Andes in summer, while levels of the Rio Negro at Manaus were 29.47 m in June 2014, corresponding to the fifth highest record during the 113 years record of the Rio Negro. While previous floods in Amazonia have been related to La Nina and/or warmer than normal tropical South Atlantic, the 2014 rainfall and flood anomalies are associated with warm condition in the western Pacific-Indian Ocean and with an exceptionally warm Subtropical South Atlantic. Our results suggest that the tropical and subtropical South Atlantic SST gradient is a main driver for moisture transport from the Atlantic toward south-western Amazon, and this became exceptionally intense during summer of 2014. specialized extreme flood Amazon basin Madeira river Bolivian Amazon Brazilian Amazon AMAZONE BASSIN BOLIVIE BRESIL ATLANTIQUE ZONE TROPICALE 062 032 9 12 art. 124007 [9 ] 2014 1748-9326 https://www.documentation.ird.fr/hor/fdi:010063643 10.1088/1748-9326/9/12/124007 1748-9326 [F B010063643] https://www.documentation.ird.fr/hor/fdi:010063643 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-08/010063643.pdf IRD - Base Horizon / Pleins textes 2015-03-03 2017-09-06 fdi:010063643 fre