@MastersThesis{Oliveira:2012:FaAsIn,
author = "Oliveira, Fernando Pereira de",
title = "Fatores associados {\`a} inicia{\c{c}}{\~a}o de linhas de
instabilidade na regi{\~a}o do Centro de Lan{\c{c}}amento de
Alc{\^a}ntara no m{\^e}s de julho",
school = "Instituto Nacional de Pesquisas Espaciais",
year = "2012",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2012-02-17",
keywords = "linha de instabilidade, Centro de Lan{\c{c}}amento de
Alc{\^a}ntara, radiossondagem, modelagem, squall lines,
Alc{\^a}ntara Launch Center, radiosonde, modeling.",
abstract = "O presente trabalho objetivou identificar os fatores associados
{\`a} inicia{\c{c}}{\~a}o de linhas de instabilidade costeiras
(LIs) em julho que afetam a regi{\~a}o do Centro de
Lan{\c{c}}amento de Alc{\^a}ntara (CLA; Alc{\^a}ntara, MA),
localizado na costa norte do Brasil. Para
identifica{\c{c}}{\~a}o subjetiva das ocorr{\^e}ncias de LIs,
foram utilizadas imagens do sat{\'e}lite GOES no canal
infravermelho de 1999 a 2009. Obteve-se a frequ{\^e}ncia
m{\'e}dia de 9 LIs em julho, sendo que 6 ocorrem sobre a
regi{\~a}o que se estende do Par{\'a} ao Cear{\'a} (ou seja,
afetando a regi{\~a}o do CLA). Para esta regi{\~a}o (do
Par{\'a} ao Cear{\'a}), foi elaborado um m{\'e}todo objetivo
(MO) de identifica{\c{c}}{\~a}o de LIs baseado nas
sa{\'{\i}}das do FORTRACC (\textit{Forecast and Tracking the
Evolution of Cloud Clusters}) de 2004 a 2009. Com o uso do MO, a
frequ{\^e}ncia m{\'e}dia foi de 6 LIs e houve boa
correspond{\^e}ncia com os casos identificados subjetivamente.
Utilizando estimativas de precipita{\c{c}}{\~a}o do TRMM
(\textit{Tropical Rainfall Measuring Mission}) para a regi{\~a}o
do CLA, constatou-se que cerca de 30\% da
precipita{\c{c}}{\~a}o de julho est{\'a} associada a eventos de
LI. Com o uso de perfis verticais sobre o CLA para o hor{\'a}rio
de 12 UTC obtidos de dados de radiossondagens e Rean{\'a}lises do
ERA-Interim no per{\'{\i}}odo de 2004 a 2009, verificou-se que,
para um dado dia de julho, maior umidade em baixos e m{\'e}dios
n{\'{\i}}veis (700 e 500 hPa) e escoamento de nordeste em altos
n{\'{\i}}veis (350 hPa) {\`a}s 12 UTC estariam associados
{\`a} inicia{\c{c}}{\~a}o da LI no final da tarde ou
in{\'{\i}}cio da noite. Constatou-se, por meio de
simula{\c{c}}{\~o}es curtas (24 h) e longas (1 m{\^e}s), que o
modelo regional MM5 {\'e} capaz de simular a forma{\c{c}}{\~a}o
de LIs. As simula{\c{c}}{\~o}es curtas (longas) mostraram que a
simula{\c{c}}{\~a}o de eventos de LI {\'e} pouco
sens{\'{\i}}vel a diferentes fontes de dados ({\`a}
condi{\c{c}}{\~a}o inicial). ABSTRACT: The main goal of this
work is to identify the conditions related to the initiation of
Squall Lines (LI) that affect the Alc{\^a}ntara Launch Center
(CLA) region (located at Brazilīs northern coast) in July.
Infrared GOES images for 1999-2009 were used to identify the
occurrence of LI. It was found that over CLA region 6 LIs are
formed in July and the average frequency was 9 LIs for the whole
coast. An objective method (MO) of LI identification based on
FORTRACC (Forecast and Tracking the Evolution of Cloud Clusters)
output was developed. This method identifies the occurrence of LI
in the region from Par{\'a} to Cear{\'a} States. For the period
from 2004 to 2009, 6 LIs cases were identified using the MO, and
there was good agreement with LI cases identified subjectively.
Using the TRMM (Tropical Rainfall Measuring Mission) precipitation
analyses, it was found that LI related rainfall accounts for about
30\% of the precipitation in July at CLA. Vertical profiles over
CLA from radiosounding and reanalysis (ERA-Interim) data were used
to identify the conditions related to LIs initiation. It was found
that higher humidity values at low and mid-levels (700 and 500
hPa) and northerly circulation at high-levels (350 hPa) are
related to LIs initiation. Short (24 h) and long term (1 month)
simulations showed that the MM5 regional model is able to
represent the frequency of LI cases. The short (long) term
simulation was not sensitive to the data source (the initial
condition).",
committee = "Ferreira, Nelson Jesuz (presidente) and Oyama, Marcos Daisuke
(orientador) and Sansigolo, Cl{\'o}vis Angeli and Cohen, Julia
Clarinda Paiva",
copyholder = "SID/SCD",
englishtitle = "Conditions related to squall lines initiation in the
Alc{\^a}ntara Launch Center region in July",
language = "pt",
pages = "99",
ibi = "8JMKD3MGP8W/3BATESB",
url = "http://urlib.net/ibi/8JMKD3MGP8W/3BATESB",
targetfile = "publicacao.pdf",
urlaccessdate = "15 jun. 2024"
}