@MastersThesis{Chan:1990:AnDiOn,
author = "Chan, Chou Sin",
title = "An{\'a}lise de dist{\'u}rbios ondulat{\'o}rios de leste sobre o
Oceano Atl{\^a}ntico Equatorial Sul",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "1990",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "1990-08-29",
keywords = "meteorologia, climatologia, Oceano Atl{\^a}ntico Equatorial Sul,
dist{\'u}rbios equatoriais, meteorology, climatology, Atlantic
Ocean, equatorial disturbance.",
abstract = "Analisa-se as caracter{\'{\i}}sticas ondulat{\'o}rias
b{\'a}sicas dos dist{\'u}rbios equatoriais de leste sobre o
Oceano Atl{\^a}ntico Equatorial Sul, pr{\'o}ximo a costa da
Am{\'e}rica do Sul, durante o First GARP (Global Atmospheric
Research Program) Global Experiment (FGGE). Foram utilizados dados
do National Meteorological Center (NMC) e dados de
radia{\c{c}}{\~a}o de onda longa (ROL). An{\'a}lises de
diagramas tipo {"}Hovmoller{"} da componente meridional do vento
revelam dist{\'u}rbios ondulat{\'o}rios se propagando para oeste
com velocidade de fase entre 10 a 12m/s, per{\'{\i}}odo entre 5
a 6 dias, e comprimento de onde 4800 km a 6200 km. H{\'a} sinais
de dist{\'u}rbios durante todo o ano. No outono ocorrem as ondas
mais curgas, enquanto no inverno ocorrem as ondss mais longas. As
an{\'a}lises mostram dist{\'u}rbios em ROL com per{\'{\i}}odos
entre 10 a 30 e entre 30 a 60 dias. Os espectros de pot{\^e}ncia
da componente meridional do vento apresentam picos no intervalo de
3 a 5 dias em 5 S. Estes picos se destacam mais nas
esta{\c{c}}{\~o}es de outono e inverno, em torno de 20 W e 25 W.
Os espectros cruzados indicam ondas se propagando para oeste com a
velocidade de 9,5 m/s e comprimento de onda de 3300 km durante o
trimestre MAM, e velocidade de 15 m/s e comprimento de 5200 km
durante o trimestre JJA. ABSTRACT: Using the National
Meteorological Center (NMC) daily data and Outgoing Longwave
Radiation data (OLR), this study focus on the main features of
wave disturbances over the Fguatorial Atlantic Ocean, vicinity of
South America, during the First GARI' Global Experiment (FGGE).
Hovmoller diagrams and spectrum analysis of the meridional
component of wind at 850 hPa are used to estimate the time scale
and the propagation features of wave disturbances. Analysis of
Hovmoller diagrams reveal, throughout the year, the existence of
waves propagating westward with a period of 5-6 days, phase speed
of 10-12 m/s, and wavelength of about 4800-6200 km. During the
southern autumn, the waves are relatively short while during the
southern winter the waves are relatively long. Also during these
seasons the amplitude of the waves are relatively larger than
during thec., ther seasons. These disturbances are only weakly
observed in OLR data, while disturbances of 10-30 days and 30-60
days period were more evident. Power spectra of meridional wind
component show peaks between 3-5 days over the Atlantic Ocean at 5
°S. These peaks are more prominent during autumn and winter and at
about 20°W and 25°W. Cross spectra indicate waves travelling
westwards at speed of 9.5 m/s and wavelength of 3300 km during
southern autumn, and at phase speed of 15 m/s and wavelength of
about 5200 km during southern winter.",
committee = "Rao, Vadlamudi Brahamananda (presidente) and Ferreira, Nelson de
Jesus (orientador) and Prakki, Satyamurty (orientador) and Kayano,
Mary Toshie and Caetano Neto, Ernesto dos Santos",
copyholder = "SID/SCD",
englishtitle = "Analysis of wave disturbances from east over equatorial South
Atlantic Oceanic",
language = "pt",
pages = "134",
ibi = "6qtX3pFwXQZGivnJSY/HcboD",
url = "http://urlib.net/ibi/6qtX3pFwXQZGivnJSY/HcboD",
targetfile = "publicacao.pdf",
urlaccessdate = "03 maio 2024"
}