@Article{CostaBern:2012:ReWiSt,
author = "Costa, Mabel Calim and Bernardes, Marcos Eduardo Cordeiro",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Remote Wind Stress Influence On Mean Sea Level In A Subtropical
Coastal Region",
journal = "Brazilian Journal of Oceanography",
year = "2012",
volume = "60",
number = "3",
pages = "331--342",
keywords = "Filtro de Thompson, an{\'a}lise espectral, NCEP/NCAR,
Canan{\'e}ia, Brasil, Thompson filter, Spectral analysis,
NCEP/NCAR, Cananeia, Brazil.",
abstract = "O presente estudo tem por objetivo avaliar a influ{\^e}ncia
relativa de tens{\~a}o do vento remoto na varia{\c{c}}{\~a}o do
n{\'{\i}}vel m{\'e}dio do mar (NMM) para a regi{\~a}o costeira
de Canan{\'e}ia (SP) durante o per{\'{\i}}odo de 1/1/1955 a
31/12/1993. Foram aplicados um filtro de passa-baixa de Thompson
(1983), otimizado para a regi{\~a}o de Canan{\'e}ia, al{\'e}m
de an{\'a}lise espectral (espectro cruzado, coer{\^e}ncia e
defasagem) entre o NMM e as componentes paralela (T//) e
perpendicular (T|) da tens{\~a}o do vento. Estas foram
extra{\'{\i}}das de quatro pontos de grade do modelo global
NCEP/NCAR. Observou-se a predomin{\^a}ncia das
oscila{\c{c}}{\~o}es anuais como aquelas de maior coer{\^e}ncia
e energia, destacando-se os per{\'{\i}}odos de aproximadamente
341 dias (frequ{\^e}ncia de 0,00293 cpd) e 410 dias
(frequ{\^e}ncia de 0,00244 cpd), respectivamente. As maiores
coer{\^e}ncias e energia em todo estudo foram encontradas nos
pontos mais distantes da costa. Este fato pode estar associado
{\`a}s restri{\c{c}}{\~o}es do modelo NCEP/NCAR em representar
os limites continentais. Conclui-se tamb{\'e}m que a tens{\~a}o
do vento remoto pode ter um papel importante em v{\'a}rias
escalas temporais do NMM, incluindo a escala anual. A partir dos
valores de coer{\^e}ncia e picos energ{\'e}ticos, a componente
paralela da tens{\~a}o do vento foi a que mostrou ser mais
influente no NMM da regi{\~a}o estudada. ABSTRACT: The purpose of
this study was to assess the relative influence of remote wind
stress on mean sea level (MSL) variations in the coastal region of
Cananeia (Sao Paulo State, Southern Brazil) during the period from
1/1/1955 to 12/31/1993. An optimized low-pass Thompson filter for
the study area, and spectral analysis (cross spectrum, coherence
and phase lag) of the relationship between the MSL and both
parallel (T//) and perpendicular (T|) wind stress components were
applied. These were extracted from four grid points of the
NCEP/NCAR global model. The predominance of annual oscillations as
those of greatest coherence and energy, of periods of
approximately 341 days (frequency of 0.00293 cpd) and 410 days
(frequency of 0.00244 cpd), respectively, were observed. Offshore
NCEP/NCAR grid points were those with the highest coherence and
energy throughout the study in relation to the observed MSL. This
may be linked to the restriction of the NCEP/NCAR model as regards
the inland limit. It is also concluded that remote wind stress may
play an important role in several MSL time scales, including the
annual ones. Based on criteria such as coherence and energy peaks,
the wind stress component of greatest effect on MSL was the
parallel one.",
issn = "1679-8759",
urlaccessdate = "28 abr. 2024"
}