Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Environmental Research Letters art. 124007 [9 ] extreme flood Amazon basin Madeira river Bolivian Amazon Brazilian Amazon AMAZONE BASSIN BOLIVIE BRESIL ATLANTIQUE ZONE TROPICALE 2014 fdi:010063643 ENG Environmental Research Letters 1748-9326 ISI:000347454800008 12 10.1088/1748-9326/9/12/124007 https://www.documentation.ird.fr/hor/fdi:010063643 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-08/010063643.pdf 9 Horizon (IRD) 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. 062 ; 032 UR182 Bolivie / Brésil / Pérou