@Article{GeirinhasTriLibCoePal:2018:ClSyCh,
author = "Geirinhas, Jo{\~a}o L. and Trigo, Ricardo M. and Libonati, Renata
and Coelho, Caio Augusto dos Santos and Palmeira, Ana Cristina",
affiliation = "{Faculdade de Ci{\^e}ncias da Universidade de Lisboa} and
{Faculdade de Ci{\^e}ncias da Universidade de Lisboa} and
{Universidade Federal do Rio de Janeiro (UFRJ)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
do Rio de Janeiro (UFRJ)}",
title = "Climatic and synoptic characterization of heat waves in Brazil",
journal = "International Journal of Climatology",
year = "2018",
volume = "38",
number = "4",
pages = "1760--1776",
month = "Mar.",
keywords = "heat waves, Brazil, atmospheric circulation patterns.",
abstract = "According to the latest global and regional circulation models,
the probability of occurrence of large heat waves (HWs), such as
the 2003 European or the 2010 Russian events will increase
significantly in the following decades under most climate
scenarios. Currently, there are numerous studies for the Northern
Hemisphere characterizing HWs and evaluating their impacts in
several areas such as public health, economy, and agriculture.
However, over South America, and in particular for Brazil, similar
analysis is lacking despite its large geographical extension and
numerous population potentially affected. Here we perform an
assessment of HW events and characteristics recorded in six large
Brazilian cities during the last five decades. The performed
analysis reveals the existence of positive and significant trends
in HW frequency since the 1980s, particularly for the cities of
SAo Paulo, Manaus, and Recife. Over the last decades, Brasilia was
the city that recorded the highest number of days per year under a
HW regime, contrasting with Rio de Janeiro that recorded the
lowest value. The assessment of the large-scale atmospheric
circulation patterns associated with summer HWs, indicated for
Porto Alegre, SAo Paulo, Rio de Janeiro, and Brasilia the presence
of well-marked concentric and positive 500 hPa geopotential height
anomalies followed by positive 850 hPa temperature anomalies.
These anomalies are likely associated with quasi-stationary
anticyclonic systems promoted by anomalous westward displacements
of the South Atlantic Subtropical High System which are related to
a weakening of other transients (and non-transient) systems such
the Intertropical Convergence Zone (ITCZ) and the South Atlantic
Convergence Zone. For Manaus, the identified anomalies are linked
to a northward displacement of the ITCZ. This configuration is
compatible with an increase in solar radiative pattern and
decreased soil moisture, enhancing surface temperature values,
possibly associated with positive feedback mechanisms between soil
and the atmosphere.",
doi = "10.1002/joc.5294",
url = "http://dx.doi.org/10.1002/joc.5294",
issn = "0899-8418",
language = "en",
targetfile = "geirinhas-climatic.pdf",
urlaccessdate = "26 abr. 2024"
}