@MastersThesis{Gonçalves:2009:ImEfQu,
author = "Gon{\c{c}}alves, Iury {\^A}ngelo",
title = "Impacto do efeito da quebra de ondas oce{\^a}nicas na estrutura
da camada limite atmosf{\'e}rica",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2009",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2009-02-16",
keywords = "Intera{\c{c}}{\~a}o oceano-atmosfera, comprimento de rugosidade,
pulveriza{\c{c}}{\~a}o, fluxo de calor, fluxo de momentum,
ocean-atmosphere interaction, sea surface roughness, sea-spray,
heat flux, momentum flux.",
abstract = "Neste trabalho foi constru{\'{\i}}do um modelo num{\'e}rico
unidimensional de Camada Limite Planet{\'a}ria (CLP), com a
Camada de Limite Superficial (CLS) segundo a teoria de
similaridade e os coeficientes de difusividade extrapolados
at{\'e} o topo da CLP. Os processos f{\'{\i}}sicos do arrasto
das ondas e da pulveriza{\c{c}}{\~a}o na atmosfera foram
implementados no modelo, com o intuito de compreender e avaliar o
efeito combinado na estrutura da CLP. A rugosidade do mar foi
investigada em fun{\c{c}}{\~a}o da idade da onda, do empinamento
da onda e do termo fonte de energia S_in (uso expl{\'{\i}}cito
do espectro de onda). Os resultados mostraram diferen{\c{c}}as
marcantes entre as parametriza{\c{c}}{\~o}es. A
redu{\c{c}}{\~a}o m{\'a}xima na velocidade do vento foi
observada pela rela{\c{c}}{\~a}o do empinamento da onda, sendo
de 48%. Quando a rugosidade do mar foi avaliada em
fun{\c{c}}{\~a}o da idade da onda e de S_in observou-se uma
redu{\c{c}}{\~a}o m{\'a}xima em torno de 27% e 12%,
respectivamente. Os resultados das simula{\c{c}}{\~o}es,
envolvendo a pulveriza{\c{c}}{\~a}o, mostraram que o efeito das
got{\'{\i}}culas sobre a transfer{\^e}ncia de momentum {\'e}
insignificante. Todavia, foi observado um resfriamento e
umedecimento nos n{\'{\i}}veis mais baixos da atmosfera
associados {\`a} evapora{\c{c}}{\~a}o das got{\'{\i}}culas. O
m{\'a}ximo resfriamento foi atingido quando o comprimento de
rugosidade foi parametrizado em fun{\c{c}}{\~a}o de S_in. Para
umidade relativa de 50%, o resfriamento e umedecimento s{\~a}o
capazes de inverter os gradientes de umidade e temperatura. Para
ventos de 20 m/s, os resultados indicaram que a
pulveriza{\c{c}}{\~a}o na atmosfera n{\~a}o pode ser
desprezada: as got{\'{\i}}culas podem alterar significativamente
os fluxos da interface. ABSTRACT: The demand for more effective
short and medium-range weather forecast has increased the interest
in studies with coupled ocean-atmosphere numerical models, in an
attempt to better represent and simulate the climate system. The
atmospheric interaction with the stirred ocean includes exchanges
of momentum, latent heat, sensible heat, water vapor and gases.
Mass (CO_2, steam, and aerosols), heat, and momentum transports
crossing the interface of these environments in both directions
occur in quantities able to modify significantly the boundary
layer on both sides, affecting the atmospheric and oceanic
circulations, the weather conditions, and the climate. The
interface dynamic is directly linked to wave evolution affecting
in the heat, momentum, and humidity fluxes. In this work was built
one-dimensional numerical model of Planetary Boundary Layer (PBL)
with the Surface Boundary Layer (SBL) agreeing with the theory of
similarity and the coefficients of diffusivity were extrapolated
up to top of the PBL. The physical processes, wave drag and the
sea spray have been implemented in the model in order to
understand and evaluate the combined effect in the structure of
PBL. The sea surface roughness was investigated according to wave
age, wave steepness and term source S_in (explicit use of wave
spectrum). The results showed notable differences among the
parameterizations. The maximum reduction in the wind speed was
observed by the relationship of the wave steepness
parameterization, 48%. When sea surface roughness was assessed,
according to wave age and S_in there was a maximum reduction of
around 27 % and 12%, respectively. The results of simulations
involving sea spray showed that the effect of droplets on the
transfer of momentum is negligible. However, was observed a
cooling and moistening at atmosphere lower levels of the
associated with droplets evaporation. The maximum moistening was
achieved when the roughness length was parameterized with S_in.
For relative humidity of 50% the cooling, and moistening were able
to reverse the gradients of humidity and temperature. For winds of
20 m/s, the results showed that the sea spray couldn't be
neglected: the droplets can significantly alter the interface
flux.",
committee = "Pezzi, Luciano Ponzi (presidente) and Innocentini, Valdir
(orientador) and Torres Junior, Aud{\'a}lio Rebelo",
copyholder = "SID/SCD",
englishtitle = "Impact of effect of the break ocean waves in the atmospheric
boundary layer structure",
language = "pt",
pages = "145",
ibi = "8JMKD3MGP8W/34MDSQH",
url = "http://urlib.net/ibi/8JMKD3MGP8W/34MDSQH",
targetfile = "publicacao.pdf",
urlaccessdate = "01 maio 2024"
}