@MastersThesis{Zea:2018:SaMuMo,
author = "Zea, Lina Esther Rivelli",
title = "Thunderstorms life cycle observation: satellite multi-channel
model for warning system",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2018",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2017-08-03",
keywords = "nowcasting, thunderstorms, eletrification, satellite,
multi-channel, nowcasting, tempestades, eletrifica{\c{c}}{\~a}o,
sat{\'e}lite, multicanais.",
abstract = "The principal objective of this research is to identify typical
cloud-top signatures of incipient thunderstorms and its early
electrification process in satellite multi-channel observations as
means of building a conceptual model of thunderstorm detection
based on brightness temperature and electrification life cycle
association. The methods toward the principal objective analyzed
the data set of CHUVA-Vale field campaign from 01 November 2011 to
31 March 2012, including multi-channel observations from the
SEVIRI infrared fields, a radar-lightning co-located data set and
a sample of 40 compact isolated thunderstorms. The sequence for
each infrared field comprises the parallax correction in satellite
observations; the co-location of satellite and radar-lightning
data; the selection of an evaluation area for thunderstorm
detection, and the construction of brightness temperature relative
cumulative-frequency distributions along with respective
thresholds analysis and validation. Consequently, 4 thunderstorm
predictors used in tandem to detect the largest differentiation
among the lightning time steps and significant cumulus cloud and
electrification intensification, resulted throughout parameters in
corresponding brightness temperature histograms whose thresholds
are as follows: IF1 or Predictor 1= Ch05-Ch06: (6.2 \− 7.3)
\$\mu\$m: Tbd \$\geq\$ \−14.0 K; IF2 or Predictor 2=
10.8 \$\mu\$m: Tb \$\leq\$ +263.0 K, IF3 or Predictor 3=
(6.2 \− 10.8) \$\mu\$m: Tbd \$\geq\$ \−14.0 K
and IF4 or Predictor 4=
(8.7\−10.8)\−(10.8\−12.0) \$\mu\$m: Tbd
\$\geq\$ 0 K. Additionally, an independent 2-day validation
test indicated that the conceptual model has a higher probability
of lightning detection for the interval of index sums from 16 to
12 because of the higher POD and lower FAR. Also the results
indicated that the conceptual model has a lower probability of
lightning detection for the interval of index sums from 8 to 4
because of the lower POD and higher FAR. This representative
behavior of the thunderstorm electrification life cycle in
geostationary satellite multi-channel observations will allow a
potential development of nowcasting tools at the boundary of
subtropical regions using data from the Meteosat Second Generation
Satellite, and with the perspective to use in the near future, the
data from the Geostationary Operational Environmental Satellite-R
and the imminent Meteosat Third Generation Satellite. RESUMO: O
objetivo principal desta pesquisa {\'e} identificar um conjunto
de assinaturas t{\'{\i}}picas do topo das nuvens que permitam
prever o processo de eletrifica{\c{c}}{\~a}o quando as nuvens se
transformam em tempestades. Atrav{\'e}s das
combina{\c{c}}{\~o}es de canais dos imageadores de
sat{\'e}lites geoestacion{\'a}rios este trabalho visa construir
um modelo conceitual de detec{\c{c}}{\~a}o de in{\'{\i}}cio
dos processos de eletrifica{\c{c}}{\~a}o de tempestades
utilizando a tend{\^e}ncia dos histogramas de temperatura de
brilho (ou diferen{\c{c}}a de canais). Para
constru{\c{c}}{\~a}o deste modelo conceitual foram utilizadas
observa{\c{c}}{\~o}es em diferentes canais infravermelhos
co-localizados com observa{\c{c}}{\~o}es de radar
polarim{\'e}trico banda X e de medidas do LMA (Lightning Mapping
Array) que consiste de fontes emitidas pelos rel{\^a}mpagos em
Very Higher Frequency. Foram selecionadas 40 tempestades compactas
durante a campanha CHUVA-Vale para a elabora{\c{c}}{\~a}o do
modelo conceitual e posteriormente os resultados foram testados em
casos independentes. A sequ{\^e}ncia dos procedimentos
metodol{\'o}gicos para campo de interesse compreende a
corre{\c{c}}{\~a}o da paralaxe nas observa{\c{c}}{\~o}es de
sat{\'e}lite; a co-localiza{\c{c}}{\~a}o com os dados de radar
e descargas el{\'e}tricas; a sele{\c{c}}{\~a}o de uma {\'a}rea
de avalia{\c{c}}{\~a}o para detec{\c{c}}{\~a}o das tempestades
e a constru{\c{c}}{\~a}o de distribui{\c{c}}{\~o}es de
frequ{\^e}ncia relativa-cumulativa de temperatura de brilho (ou
diferen{\c{c}}as) e a defini{\c{c}}{\~a}o de limiares para a
constru{\c{c}}{\~a}o das frequ{\^e}ncias cumuladas. Quatro
canais ou diferen{\c{c}}a de canais foram selecionados para
detectar o processo de eletrifica{\c{c}}{\~a}o da nuvem. Os
seguintes preditores foram utilizados: IF1 or Predictor 1= (6.2
\− 7.3) \$\mu\$m: Tbd \$\geq\$\−14.0 K; IF2 or
Predictor 2= 10.8 \$\mu\$m: Tb \$\leq\$+223.0 K, IF3 or
Predictor 3= (6.2 \− 10.8) \$\mu\$m: Tbd
\$\geq\$\−14.0 K and IF4 or Predictor 4= (8.7 \−
10.8) \− (10.8 \− 12.0) \$\mu\$m: Tbd \$\geq\$
0 K. Esse conjunto de preditores foi utilizado em
fun{\c{c}}{\~a}o das propriedades que esses canais t{\^e}m para
descrever os processos microf{\'{\i}}sicos das nuvens. Ap{\'o}s
a defini{\c{c}}{\~a}o do modelo, um teste de
valida{\c{c}}{\~a}o independente de 2 dias permitiu definir as
incertezas do modelo conceitual. O emprego dos campos selecionados
quando empregados juntos melhoram significativamente a
previsibilidade do processo de eletrifica{\c{c}}{\~a}o da nuvem.
Este comportamento representativo do ciclo de vida da
eletrifica{\c{c}}{\~a}o das tempestades atrav{\'e}s de
combina{\c{c}}{\~o}es de canais de sat{\'e}lite
geoestacion{\'a}rio permitir{\'a} o desenvolvimento de
ferramentas de previs{\~a}o a curt{\'{\i}}ssimo prazo nas
regi{\~o}es tropicais e subtropicais usando dados do Meteosat
Second Generation e, em breve, do Geostationary Operational
Environmental Satellite-R e do futuro Meteosat Third Generation
Satellite.",
committee = "Arav{\'e}quia, Jos{\'e} Antonio (presidente) and Machado, Luiz
Augusto Toledo (orientador) and Ceballos, Juan Carlos and Mattos,
Enrique Viera and Nesbitt, Stephen William",
englishtitle = "Observa{\c{c}}{\~a}o do ciclo de vida de
electrica{\c{c}}{\~a}o das tempestades: aplica{\c{c}}{\~a}o de
multicanais para modelo conceitual de nowcasting",
language = "en",
pages = "127",
ibi = "8JMKD3MGP3W34P/3P7RM3E",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3P7RM3E",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}