@MastersThesis{Silva:2022:ObJaGi,
author = "Silva, Diego Rhamon Reis da",
title = "Observa{\c{c}}{\~a}o de jatos gigantes no Brasil e
condi{\c{c}}{\~o}es meteorol{\'o}gicas associadas",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2022",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2022-03-03",
keywords = "descargas el{\'e}tricas, rel{\^a}mpagos, jato gigante,
meteorologia, sensoriamento remoto, electric discharges,
lightning, gigantic jet, meteorology, remote sensing.",
abstract = "O presente trabalho analisou e determinou as
caracter{\'{\i}}sticas f{\'{\i}}sicas de 13 gigantic jets
(GJs) registrados em v{\'{\i}}deo no Brasil ocorridos entre 2017
e 2021, as caracter{\'{\i}}sticas f{\'{\i}}sicas dos sistemas
convectivos associados e as caracter{\'{\i}}sticas
f{\'{\i}}sicas e el{\'e}tricas dos rel{\^a}mpagos que geraram
os GJs. As caracter{\'{\i}}sticas f{\'{\i}}sicas dos GJs
(dura{\c{c}}{\~a}o, morfologia, altura dos topos) e dos sistemas
convectivos associados (temperatura de brilho, taxa de
expans{\~a}o, est{\'a}gio do ciclo de vida em que ocorreram os
GJs), bem como dos rel{\^a}mpagos (localiza{\c{c}}{\~a}o
relativa ao sistema convectivo) observadas foram semelhantes e
condizentes com estudos anteriores realizados em diversas
regi{\~o}es do planeta. As regi{\~o}es de ocorr{\^e}ncia de
todos os sistemas convectivos associados os GJs estudados, exceto
em um caso, estavam sob influ{\^e}ncia de anticiclones ou cristas
tanto em 250 hPa quanto em 500 hPa, seja nas bordas ou nos seus
centros ou eixos. Em 850 hPa e em superf{\'{\i}}cie, a maioria
dos casos apresentava a atua{\c{c}}{\~a}o de cavados ou baixas
press{\~o}es, ou conflu{\^e}ncia dos ventos nas regi{\~o}es de
ocorr{\^e}ncia dos GJs. Os resultados indicam que esta
configura{\c{c}}{\~a}o atmosf{\'e}rica pode ser um fator
importante na forma{\c{c}}{\~a}o de nuvens profundas e na
ocorr{\^e}ncia de GJs. Todas as observa{\c{c}}{\~o}es de GJs
analisadas ocorreram durante o per{\'{\i}}odo noturno, devido
{\`a}s limita{\c{c}}{\~o}es dos instrumentos utilizados. A
inexist{\^e}ncia de registros diurnos de GJs at{\'e} o momento
n{\~a}o permite afirmar que a morfologia dos GJs, a profundidade
dos sistemas convectivos e as condi{\c{c}}{\~o}es
atmosf{\'e}ricas na troposfera e na ionosfera favor{\'a}veis
{\`a} ocorr{\^e}ncia de GJs possam ser v{\'a}lidas tamb{\'e}m
para o per{\'{\i}}odo diurno. Uma caracter{\'{\i}}stica
observacional sistematicamente encontrada nas ocorr{\^e}ncias dos
GJs estudados foi a presen{\c{c}}a de ventos fracos a moderados
em altos n{\'{\i}}veis. ABSTRACT: This work analyzed and
determined the physical characteristics of 13 gigantic jets (GJs)
recorded on video in Brazil occurred between 2017 and 2021, the
physical characteristics of the associated convective systems and
the physical and electrical characteristics of the lightning that
generated the GJs. The physical characteristics of the GJs
(duration, morphology, top heights) and of the associated
convective systems (brightness temperature, expansion rate, life
cycle moment in which the GJs occurred), as well as of lightning
(relative location to the convective system) observed were similar
and consistent with previous studies conducted in different
regions of the planet. The regions of occurrence of all convective
systems associated with the GJs studied, except for one case, were
under the influence by anticyclones or ridges, both at 250 hPa and
500 hPa, either at the edges or at their centers or axes. At 850
hPa and on the surface, most of the cases presented the action of
troughs or low pressures, or wind confluence in the GJs occurrence
regions. The results indicate that this atmospheric configuration
may be an important factor in the formation of deep clouds and in
the occurrence of GJs. All analyzed GJs observations occurred
during the night period, due to the instruments limitations. The
absence of diurnal records of GJs does not allow us to affirm that
the morphology of GJs, depth of convective systems and the
atmospheric conditions in the troposphere and ionosphere favorable
to the occurrence of GJs can also be valid for the daytime period.
An observational characteristic systematically found in the
occurrences of the GJs studied was the presence of light to
moderate winds at high levels.",
committee = "Coelho, Simone Marilene Sievert da Costa (presidente) and Negri,
Renato Galante (orientador) and Mattos, Enrique Vieira and Saba,
Marcelo Magalh{\~a}es Fares and Ferreira, Nelson Jesuz and
Albrecht, Rachel Ifanger",
englishtitle = "Observation of gigantic jets in Brazil and associated weather
conditions",
language = "pt",
pages = "105",
ibi = "8JMKD3MGP3W34T/46E8KH8",
url = "http://urlib.net/ibi/8JMKD3MGP3W34T/46E8KH8",
targetfile = "publicacao.pdf",
urlaccessdate = "23 abr. 2024"
}