@MastersThesis{Mateus:2021:CoFoCa,
author = "Mateus, Nelson Pedro Ant{\'o}nio",
title = "Conex{\~o}es entre fontes de calor, oscila{\c{c}}{\~a}o Madden
Julian e v{\'o}rtices cicl{\^o}nicos de altos n{\'{\i}}veis na
vizinhan{\c{c}}a do Nordeste do Brasil",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2021",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2020-03-02",
keywords = "Oscila{\c{c}}{\~a}o Madden-Julian, VCANs, modelo MWG,
Madden-Julian Oscillation, ULCV, MWG model.",
abstract = "Este trabalho avalia as conex{\~o}es entre fontes de calor,
Oscila{\c{c}}{\~a}o de Madden Julian (OMJ) e V{\'o}rtices
Cicl{\^o}nicos de Altos N{\'{\i}}veis (VCAN) na
vizinhan{\c{c}}a do Nordeste do Brasil (NEB). O per{\'{\i}}odo
de estudo envolve o ver{\~a}o austral de 1980 a 2013. Para isso,
foram utilizados os seguintes conjuntos de dados:
Radia{\c{c}}{\~a}o de Onda Longa (ROL), vento zonal e meridional
na alta e baixa troposfera, provenientes do National Centers for
Environmental Prediction (NCEP), dados de precipita{\c{c}}{\~a}o
do Climate Prediction Center (CPC). A metodologia utilizada foi
baseada em tr{\^e}s etapas. Primeiro, caracterizou-se a
variabilidade intrasazonal das fontes de calor na Am{\'e}rica do
Sul (AS), nas fases convectivas da OMJ. Na segunda etapa, fez-se
um levantamento da frequ{\^e}ncia dos VCANs nas oito fases da
OMJ, e avaliou-se qual a prefer{\^e}ncia desses v{\'o}rtices, em
rela{\c{c}}{\~a}o a profundidade. A terceira parte foi baseada
na simula{\c{c}}{\~a}o das fases convectivas da OMJ,
atrav{\'e}s do modelo de {\'a}gua rasa de Matsuno-Webster-Gill
(MWG) na baixa troposfera. Os resultados obtidos indicam que as
principais fontes de calor na AS est{\~a}o localizadas na
Col{\^o}mbia, Bol{\'{\i}}via, ZCIT, Amaz{\^o}nia, Nordeste e
Sudeste do Brasil. Essas fontes de calor s{\~a}o mais intensas
quando a OMJ se propaga nas fases F7, F8 e F1. Geralmente, nas
fases F1 e F8, a intensidade das fontes de calor localizadas no
Sudeste do Brasil e na ZCIT {\'e} maior para amplitudes
superiores ou iguais a 2,5. Amplitudes menores que 2,5, tendem a
diminuir a intensidade de Q nessas regi{\~o}es. Tendo em vista
que a intensidade das fontes de calor varia nas fases convectivas
da OMJ, avaliou-se a frequ{\^e}ncia dos VCANs nas 8 fases. A
maior ocorr{\^e}ncia (62,2%) acontece em dias ativos, sendo que
as fases F7 e F8 apresentam maior frequ{\^e}ncia. Essa
caracter{\'{\i}}stica, possivelmente est{\'a} relacionada com o
aumento da convec{\c{c}}{\~a}o em regi{\~o}es pr{\'o}ximas da
forma{\c{c}}{\~a}o desses v{\'o}rtices. A menor frequ{\^e}ncia
ocorre nas fases que menos impactam a AS (F6 e F5). Os resultados
das simula{\c{c}}{\~o}es com o modelo MWG mostram que na fase
F7, a presen{\c{c}}a de fontes de calor localizadas no Sudeste e
nas ZCAS oce{\^a}nica, resulta em 2 grandes centros de anomalias
de circula{\c{c}}{\~a}o cicl{\^o}nica, localizados na
regi{\~a}o SE e no Sul do Atl{\^a}ntico Sudoeste,
respectivamente. As fontes de calor no NEB e no SW geram uma ampla
anomalia cicl{\^o}nica nas fases F1 e F8. As fontes de calor
localizadas no Pac{\'{\i}}fico e Continente Mar{\'{\i}}timo
influenciam para o aumento ou supress{\~a}o dos movimentos
verticais. A an{\'a}lise dos limites de amplitude, em
rela{\c{c}}{\~a}o {\`a} precipita{\c{c}}{\~a}o, mostrou que
amplitudes entre 1 a 2,5 propiciam aumento das chuvas nas
regi{\~o}es Centro Oeste e NEB na fase F8. Por outro lado, na
fase F1, amplitudes maiores ou iguais a 2,5 est{\~a}o associadas
com deficit das chuvas no Sudeste e Sul do Brasil. ABSTRACT: This
work evaluates the connections among heat sources, Madden Julian
Oscillation (MJO) and Upper Levels Cyclonic Vortexes (ULCV) in the
neighborhood of Northeast Brazil (NEB). The study period involves
the southern summer from 1980 to 2013. For this, the following
data sets were used: Outgoing Long Wave Radiation (OLR), zonal and
meridional wind in the upper and lower troposphere, derived from
the National Centers for Environmental Prediction (NCEP), and
precipitation data from the Climate Prediction Center (CPC).The
methodology used was based on three stages. First, the
intraseasonal variability of heat sources in South America (SA)
was characterized in the convective phases of MJO. In the second
stage, a survey of ULCV was made to determine its eight frequency
phases of MJO, and the predominance of these vortexes in relation
to depth. The third stage was based on the OMJ convective phases
simulation, using the shallow water model of Matsuno- Webster-Gill
(MWG) in the lower troposphere. The results indicate that the main
sources of heat in the SA are located in Colombia, Bolivia, ITZC,
Amazonia, Northeast and Southeast Brazil. These heat sources are
more intense when the MJO move in phases F7, F8 and F1. Generally,
in phases F1 and F8, the intensity of the heat sources located in
the Southeast of Brazil and in the ITCZ is greater for amplitudes
greater than or equal to 2.5. Amplitudes less than 2.5 tend to
decrease the intensity of Q in these regions. Bearing in mind that
the intensity of the heat sources varies in the convective phases
of MJO, the frequency of ULVC in the 8 phases was evaluated. The
highest occurrence (62.2 %) happens on active days, phases F7 and
F8 are common. This characteristic is possibly related to the
increase in convection in regions close to the formation of these
vortexes. The lowest frequency occurs in the phases that least
impact SA (F6 and F5). The simulations with the MWG model, shows
that in the F7 phase, the heat sources located in the Southeast
and in the oceanic SAZC, results in 2 large centers of cyclonic
circulation anomalies, located in the SE region and in the South
Southwest Atlantic, respectively. The heat sources in NEB and SW
generate a wide cyclonic anomaly in phases F1 and F8. The heat
sources located in the Pacific and Maritime Continent influence
the increase or suppression of vertical movements. The analysis of
the amplitude limits in relation to precipitation, showed that
amplitudes between 1 and 2.5 provide increased rainfall in the
Midwest and NEB regions in phase F8. On the other hand, in phase
F1, amplitudes greater than or equal to 2.5, are associated with
deficit of rains in the Southeast and South of Brazil.",
committee = "Coelho, Simone Marilene Sievert da Costa (presidente) and
Ferreira, Nelson Jesuz (orientador) and Hern{\'a}ndez,
Juli{\'a}n David Rojo (orientador) and Gan, Manoel Alonso and
Dias, Pedro Leite da Silva",
englishtitle = "Connections of heat sources, Madden Julian oscillation and upper
levels cyclonic vortex in the neighborhood of Northeast Brazil.",
language = "pt",
pages = "115",
ibi = "8JMKD3MGP3W34R/426A64S",
url = "http://urlib.net/ibi/8JMKD3MGP3W34R/426A64S",
targetfile = "publicacao_FA provisoria.pdf",
urlaccessdate = "28 abr. 2024"
}