The 2014 southeast Brazil austral summer drought: regional scale mechanisms and teleconnections

  • Coelho C
  • de Oliveira C
  • Ambrizzi T
 et al. 
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Abstract

found to be part of a large-scale teleconnection wave train linked with the subsidence branch of the Walker circula-tion in the tropical east Pacific, which in turn was generated by an anomalous tropical heat source in north/northeastern Australia. A regional Hadley circulation with an ascending branch to the south of the subsidence branch of the Walker circulation in the tropical east Pacific was identified as an important component connecting the tropical and extrat-ropical circulation. The ascending branch of this Hadley circulation in the south Pacific coincided with an identified Rossby wave source region, which contributed to establish-ing the extratropical component of the large-scale wave train connecting the south Pacific and the Atlantic region surrounding southeast Brazil. This connection between the Pacific and the Atlantic was confirmed with Rossby ray tracing analyses. The local circulation response was associ-ated to downward air motion (subsidence) over Southeast Brazil, contributing to the expressive negative precipitation anomalies observed during summer 2014, and leading to a major drought event in the historical context. The analysis of atmospheric and oceanic patterns of this event helped defining a schematic framework leading to the observed drought conditions in southeast Brazil, including the involved teleconnections, blocking high pressure, radiative and humidity transport effects.

Author-supplied keywords

  • Austral summer
  • Drought
  • Precipitation
  • Sea surface temperature
  • Southeast Brazil
  • Teleconnections

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Authors

  • Caio A.S. Coelho

  • Cristiano Prestrelo de Oliveira

  • Tércio Ambrizzi

  • Michelle Simões Reboita

  • Camila Bertoletti Carpenedo

  • José Leandro Pereira Silveira Campos

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