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

Autor(es)

Carlo Espinoza, Jhan ^[1] ; Marengo, Jose Antonio ^[2] ; Ronchail, Josyane ^[3] ; Molina Carpio, Jorge ^[4] ; Noriega Flores, Luis ^[5] ; Loup Guyot, Jean ^[6]

Afiliação do(s) autor(es)

^[1] IGP, Lima - Peru

^[2] Inst Nacl Pesquisas Espaciais, Ctr Ciencia Sistema Terr, Sao Paulo - Brazil

^[3] UPMC, Univ Paris 04, Univ Paris Diderot, Sorbonne Paris Cite, UMR Locean, CNRS, IRD, MNHN, Paris - France

^[4] Univ Mayor San Andres, Inst Hidraul & Hidrol, La Paz - Bolivia

^[5] Serv Nacl Meteorol & Hidrol, La Paz - Bolivia

^[6] IRD, Lima - Peru

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL RESEARCH LETTERS; v. 9, n. 12 DEC 2014.
• Citações Web of Science: 57

Resumo

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. (AU)

• Processo FAPESP: 13/50538-7 - Entendimento das causas dos vieses que determinam o início da estação chuvosa na Amazônia nos modelos climáticos usando observações do GoAmazon e CHUVA
• Beneficiário: Jose Antonio Marengo Orsini
• Modalidade de apoio: Auxílio à Pesquisa - Regular