The extreme 2014 flood in south-western Amazon basin: the role of tropical-subtropical South Atlantic SST gradientReport as inadecuate




The extreme 2014 flood in south-western Amazon basin: the role of tropical-subtropical South Atlantic SST gradient - Download this document for free, or read online. Document in PDF available to download.

1 Instituto Geofisico del Peru 2 INPE - Instituto Nacional de Pesquisas Espaciais 3 PARVATI - Processus de la variabilité climatique tropicale et impacts LOCEAN - Laboratoire d-Océanographie et du Climat : Expérimentations et Approches Numériques 4 Universidad Mayor de San Andrés 5 Instituto de hidraulica e Hidrologia 6 IRD Peru

Abstract : 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 m3 s−1 at Porto Velho and 380% 25 000 m3 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 Niña 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 southwestern Amazon, and this became exceptionally intense during summer of 2014.

Keywords : Brazilian Amazon Madeira river extreme flood Amazon basin Bolivian Amazon





Author: Jhan Carlo Espinoza - José Antonio Marengo - Josyane Ronchail - Jorge Molina Carpio - Luís Noriega Flores - Jean Loup Guyot -

Source: https://hal.archives-ouvertes.fr/



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