@PhDThesis{Nunes:2002:InFíMo,
author = "Nunes, Ana Maria Bueno",
title = "Inicializa{\c{c}}{\~a}o f{\'{\i}}sica em modelos de
previs{\~a}o de tempo e estudo de seus efeitos na
parti{\c{c}}{\~a}o de energia em modos verticais e horizontais
nos tr{\'o}picos e na Am{\'e}rica do Sul",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2002",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2002-02",
keywords = "inicializa{\c{c}}{\~a}o f{\'{\i}}sica, assimila{\c{c}}{\~a}o
de precipita{\c{c}}{\~a}o, previs{\~a}o n{\'u}merica de tempo,
modelos espectrais, tr{\'o}picos, Am{\'e}rica do Sul.",
abstract = "A inicializa{\c{c}}{\~a}o f{\'{\i}}sica foi desenvolvida por
pesquisadores da Florida State University para aprimorar a
previs{\~a}o de precipita{\c{c}}{\~a}o na regido tropical pelos
modelos de previs{\~a}o num6rica de tempo. Neste procedimento de
inicializa{\c{c}}{\~a}o, as taxas de precipita{\c{c}}{\~a}o
observadas s{\~a}o assimiladas usando algoritmos de
convec{\c{c}}{\~a}o cumulus inversa e relaxa{\c{c}}{\~a}o
newtoniana. Ao final do per{\'{\i}}odo de
assimila{\c{c}}{\~a}o - tipicamente 24 horas - o modelo
ser{\'a} capaz de reproduzir as apropriadas taxas de
precipita{\c{c}}{\~a}o. A habilidade do modelo espectral
regional FSU em assimilar dados de alta resolu{\c{c}}{\~a}o de
precipita{\c{c}}{\~a}o sobre o Brasil ser{\'a} enfocada neste
trabalho. JA que o modelo espectral global FSU foi usado como
campo b6sico (i.e. contorno) para o modelo regional, 6, em
adi{\c{c}}{\~a}o, examinado o impacto da
inicializa{\c{c}}{\~a}o do modelo global sobre a
assimila{\c{c}}{\~a}o de precipita{\c{c}}{\~a}o pelo modelo
regional. A inicializa{\c{c}}{\~a}o f{\'{\i}}sica f6i tamb6m
inclu{\'{\i}}da na vers{\~a}o do modelo espectral global do
Center for Ocean-Land-A tmosph ere Studies usada pelo Centro de
Previs{\~a}o do Tempo e Estudos Clim{\'a}ticos no Brasil. Por
meio de condiq6es fisicamente inicializadas, a previs{\~a}o da
chuva acumulada em 24 horas dos modelos regional FSU e global do
CPTEC tiveram os coeficientes de correla{\c{c}}{\~a}o espacial
aumentados quando comparadas com as estimativas obtidas atrav6s
dos dados do Special Sensor Microwavellmager e de
Radia{\c{c}}{\~a}o de Onda Longa Emergente. Um estudo dos
efeitos da inicializa{\c{c}}{\~a}o sobre as estruturas verticais
e horizontais dos modos normais mostrou que os modos misto
Rossby-gravidade, gravidade leste e oeste, com complexas
estruturas verticais e, portanto, com alturas equivalentes
menores, t6m sua energia total aumentada por influ6ncia da
inicializa{\c{c}}{\~a}o f{\'{\i}}sica. Por outro lado, a
percentagern da energia total nos modos verticais relacionados h
convec{\c{c}}{\~a}o, com maiores alturas equivalentes, 6
diminu{\'{\i}}da devido h inicializa{\c{c}}{\~a}o
f{\'{\i}}sica, tamb6m nos modos misto, gravidade leste e oeste,
Durante o ver{\~a}o do Hemisf6rio Sul, a intera{\c{c}}{\~a}o do
modo de gravidade oeste com o modo Rossby, e com o modo Kelvin
contribuem positivamente para a energia total sobre a regido da
Zona de Converg6ncia do AtHintico Sul. ABSTRACT: Physical
initialization was developed at The Florida State University to
improve rainfall forecast over tropical region by numerical
weather prediction models. III this initialization procedure,
observed rainfall rates are assimilated using reverse cumulus
algorithms and nudging. At the end of the assimilation period -
usually 24 hours - the model will be able to reproduce the proper
rainfall rates. The ability of the FSU regional spectral model to
assimilate high resolution rainfall data over Brazil will be
focused in this work. Since the FSU global spectral model was used
as a base field (i.e. boundary) for the regional model, the impact
of initialization of the global model on the regional model's
ability to assimilate rainfall is also examined. Physical
initialization was also included in a version of the Center for
Ocean-Land-Atmosphere Studies Global Spectral Model used by the
Center for Weather Prediction and Climate Studies in Brazil. The
24-hour accumulated precipitation predicted fields from the
physically initialized conditions show improved correlations with
the Special Sensor Microwave/Imager-Outgoing Longwave Radiation
estimates in FSU regional and CPTEC global models. A study of
physical initialization effects on the normal mode vertical and
horizontal structures showed that mixed Rossby-gravity mode, and
eastward and westward propagating gravity modes with complex
vertical structures, which have smaller equivalent depths,
increase their total energy by the influence of physical
initialization. On the other hand, the percentage of total energy
in the vertical modes related to the convection - with larger
equivalent depths - is decreased in the mixed Rossby-gravity mode,
and in the two gravity modes due to physical initialization.
During the Southern Hemisphere summer, westward gravity mode
interaction with Rossby mode as well as Kelvin mode contribute
positively to the total energy in the region of the South Atlantic
Convergence Zone.",
committee = "Ceballos, Juan Carlos and Satyamurty, Prakki (orientador) and
Bonatti, Jos{\'e} Paulo (orientador) and Nobre, Carlos Afonso and
Ferreira, Nelson Jesus and Ferreira, Marlene Elias and Farina,
Leandro",
copyholder = "SID/SCD",
englishtitle = "Physical initialization in weather prediction models and study of
its effects on the energy partition the vertical and horizontal
modes over the tropics and South Americar",
language = "pt",
pages = "217",
ibi = "6qtX3pFwXQZ3P8SECKy/znm4y",
url = "http://urlib.net/ibi/6qtX3pFwXQZ3P8SECKy/znm4y",
targetfile = "paginadeacesso.html",
urlaccessdate = "05 maio 2024"
}