@MastersThesis{Lima:2015:VaInCi,
author = "Lima, Jeane Rafaele Ara{\'u}jo",
title = "Variabilidade interanual da circula{\c{c}}{\~a}o de
mon{\c{c}}{\~a}o da Am{\'e}rica do Sul",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2015",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2015-10-29",
keywords = "variabilidade interanual, precipita{\c{c}}{\~a}o,
mon{\c{c}}{\~a}o da Am{\'e}rica do Sul, interannual
variability, rainfall, monsoon in South America.",
abstract = "O Sistema de Mon{\c{c}}{\~a}o da Am{\'e}rica do Sul (SMAS)
{\'e} respons{\'a}vel por influenciar a circula{\c{c}}{\~a}o
atmosf{\'e}rica e a precipita{\c{c}}{\~a}o sobre a maior parte
da Am{\'e}rica do Sul (AS) tropical durante a esta{\c{c}}{\~a}o
de ver{\~a}o. Estudos que visem compreender a variabilidade
temporal deste sistema s{\~a}o de grande valia para o meio
cient{\'{\i}}fico, uma vez que, n{\~a}o est{\~a}o totalmente
claros os processos que controlam o clima de mon{\c{c}}{\~o}es.
Assim, o principal objetivo desta pesquisa {\'e} investigar os
poss{\'{\i}}veis fatores clim{\'a}ticos de grande escala e os
mecanismos de intera{\c{c}}{\~a}o remota, que podem estar
associados {\`a} variabilidade interanual durante a
esta{\c{c}}{\~a}o de ver{\~a}o. Neste sentido busca-se
compreender as principais diferen{\c{c}}as entre os extremos de
chuva e de seca sobre o Sudeste da Bacia Amaz{\^o}nica (SAB),
Centro-Oeste (COB) e Sudeste (SE) do Brasil, {\'a}reas que
s{\~a}o influenciadas pelo regime de mon{\c{c}}{\~a}o. Para
tais an{\'a}lises foram utilizadas correla{\c{c}}{\~o}es de
Pearson, t{\'e}cnica de quantis e an{\'a}lise de compostos
m{\'e}dios durante o per{\'{\i}}odo de 1979 a 2014. Os
resultados obtidos atrav{\'e}s da correla{\c{c}}{\~a}o entre a
anomalia da precipita{\c{c}}{\~a}o no SAB e a anomalia de
temperatura da superf{\'{\i}}cie do mar (ATSM) e, das
componentes do vento em 850 hPa e 300 hPa indicam a
influ{\^e}ncia dos eventos El Niņo-Oscila{\c{c}}{\~a}o Sul
(ENOS). As anomalias de precipita{\c{c}}{\~a}o no COB n{\~a}o
apresentaram correla{\c{c}}{\~o}es significativas com as ATSM.
Por{\'e}m, na an{\'a}lise de compostos m{\'e}dios, um
padr{\~a}o semelhante aos ENOS do tipo Modoki foram observados.
Em 850 hPa observou-se a presen{\c{c}}a de uma
circula{\c{c}}{\~a}o cicl{\^o}nica (anticl{\^o}nica)
an{\^o}mala sobre a regi{\~a}o central da AS durante os
ver{\~o}es chuvosos (secos). No SE do Brasil foi observado um
dipolo de ATSM sobre o Atl{\^a}ntico Sul, assim como,
verificou-se a presen{\c{c}}a de circula{\c{c}}{\~o}es
an{\^o}malas com estrutura barotr{\'o}pica equivalente sobre
estas {\'a}reas de ATSM. Este padr{\~a}o {\'e} identificado nos
casos de ver{\~o}es secos no SE. Em 300 hPa observou-se o trem de
onda entre as latitudes de 30\$^{o}\$S-60\$^{o}\$S com
curvatura de arco a partir da longitude de 120\$^{o}\$W
atingindo a AS. A an{\'a}lise da variabilidade interanual dos
ver{\~o}es foi investigada e os resultados indicaram que na
{\'u}ltima d{\'e}cada ocorreram mais ver{\~o}es chuvosos do que
secos na regi{\~a}o do SBA. J{\'a} a regi{\~a}o SE vem sofrendo
um d{\'e}ficit de precipita{\c{c}}{\~a}o desde os {\'u}ltimos
cinco ver{\~o}es, sendo o ver{\~a}o de 2013/2014 considerado o
mais seco dos {\'u}ltimos 35 ver{\~o}es. ABSTRACT: The South
America Monsoon System (SAMS) is responsible for influencing the
atmospheric circulation and precipitation over most of tropical
South America (SA) during the summer season. Studies aiming to
understand the temporal variability of this system have great
value for the scientific community, because the processes that
controls the monsoon climate are not totally clear. Thus, the main
objective of this research is to investigate the possible
large-scale climatic factors and the remote interaction
mechanisms, which may be associated with summer season interannual
variability focussing on identifying the main differences between
dry and wet extremes in the South-eastern Amazon Basin (SAB),
Central- West (WC) and Southeast (SE) Brazil, which are areas
influenced by the monsoon regime. For such analyzes, Pearson
correlations, quantile method and composite analysis were used
during the period from 1979 to 2014. The correlation between
precipitation anomaly in SAB and the sea surface temperature
anomaly (SSTA) and wind at 850hPa and 300 hPa indicates El
Niņo-Southern Oscillation (ENSO) influence. Precipitation
anomalies in WC did not show significant correlation with SSTA.
However, a pattern similar to ENSO Modoki type was observed in the
composite analysis. At 850 hPa, the presence of a anomalous
cyclonic circulation (anticyclonic) was observed over the central
region of SA during wet (dry) summers seasons. Over SE region of
Brazil, a dipole SSTA pattern over the South Atlantic was
identified, as well the presence of anomalous circulations with an
equivalent barotropic structure over these SSTA areas. This
pattern is more evident in case of dry summer on the SE. At 300
hPa, the wave train between 30\$^{o}\$S-60\$^{o}\$S was
observed presenting a curvature feature from 120\$^{o}\$W
reaching SA. Analysis of the summer interannual variability the
manifestation of indicated wet summers more frequently than dry
summers in the SAB during the last decade. On the other hand the
SE region experienced rainfall deficit during the last five summer
seasons, with the summer of 2013/2014 considered the driest over
the last 35 summers.",
committee = "Coelho, Caio Augusto dos Santos (presidente) and Gan, Manoel
Alonso (orientador) and Castro, Christopher Alexander Cunningham",
copyholder = "SID/SCD",
englishtitle = "Variability on year of south american monsoon circulation",
language = "pt",
pages = "171",
ibi = "8JMKD3MGP3W34P/3KB7DDE",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3KB7DDE",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}