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@Article{CoelhoOARCCTPCDRR:2015:ReScMe,
               author = "Coelho, Caio Augusto dos Santos and Oliveira, Cristiano Prestelo 
                         and Ambrizzi, T{\'e}rcio and Reboita, Michelle Sim{\~o}es and 
                         Carpenedo, Camila Bertoletti and Campos, Jos{\'e} Leandro Pereira 
                         Silveira and Tomaziello, Ana Carolina N{\'o}bile and Pampuch, 
                         Luana Albertani and Cust{\'o}dio, Maria de Souza and Dutra, Livia 
                         M{\'a}rcia Mosso and Rocha, Rosmeri P. da and Rebbein, Amanda",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade Federal de Itajub{\'a} 
                         (UNIFEI)} and {Universidade de S{\~a}o Paulo (USP)} and 
                         {Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade de S{\~a}o Paulo (USP)} 
                         and {Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade de S{\~a}o Paulo (USP)} 
                         and {Universidade de S{\~a}o Paulo (USP)}",
                title = "The 2014 southeast Brazil austral summer drought: regional scale 
                         mechanisms and teleconnections",
              journal = "Climate Dynamics",
                 year = "2015",
               volume = "x",
                month = "Aug.",
             keywords = "Drought, Teleconnections, Sea surface temperature, Austral summer, 
                         Precipitation, Southeast Brazil.",
             abstract = "The southeast region of Brazil experienced in austral summer 2014 
                         a major drought event leading to a number of impacts in water 
                         availability for human consumption, agricultural irrigation and 
                         hydropower production. This study aims to perform a diagnostic 
                         analysis of the observed climate conditions during this event, 
                         including an inspection of the occurred precipitation anomalies in 
                         the context of previous years, and an investigation of possible 
                         relationships with sea surface temperatures and atmospheric 
                         circulation patterns. The sea surface temperature analysis 
                         revealed that the southwestern South Atlantic Ocean region near 
                         the coast of southeast Brazil showed strong negative association 
                         with precipitation over southeast Brazil, indicating that 
                         increased sea temperatures in this ocean region are consistent 
                         with reduced precipitation as observed in summer 2014. The 
                         circulation analysis revealed prevailing anti-cyclonic anomalies 
                         at lower levels (850 hPa) with northerly anomalies to the west of 
                         southeast Brazil, channeling moisture from the Amazon towards 
                         Paraguay, northern Argentina and southern Brazil, and drier than 
                         normal air from the South Atlantic Ocean towards the southeast 
                         region of Brazil. This circulation pattern was found to be part of 
                         a large-scale teleconnection wave train linked with the subsidence 
                         branch of the Walker circulation 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 
                         extratropical circulation. The ascending branch of this Hadley 
                         circulation in the south Pacific coincided with an identified 
                         Rossby wave source region, which contributed to establishing 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 associated 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.",
                  doi = "10.1007/s00382-015-2800-1",
                  url = "http://dx.doi.org/10.1007/s00382-015-2800-1",
                 issn = "0930-7575",
             language = "en",
        urlaccessdate = "25 nov. 2020"
}


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