@Article{CoelhoOARCCTPCDRR:2016:ReScMe,
author = "Coelho, Caio Augusto dos Santos and Oliveira, Cristiano Prestrelo
de 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,
L{\'{\i}}via Marcia Mosso and Rocha, Rosmeri P. da and Rehbein,
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 = "2016",
volume = "46",
number = "11/12",
pages = "3737--3752",
month = "June",
keywords = "Austral summer, Drought, Precipitation, Sea surface temperature,
Southeast Brazil, Teleconnections.",
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",
label = "self-archiving-INPE-MCTI-GOV-BR",
language = "en",
targetfile = "coelho_2014.pdf",
urlaccessdate = "27 abr. 2024"
}