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Doctoral Thesis
DOI
10.11606/T.21.2014.tde-11032015-141317
Document
Author
Full name
Helvio Prevelato Gregorio
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Castro Filho, Belmiro Mendes de (President)
Camargo, Ricardo de
Harari, Joseph
Lorenzzetti, Joao Antonio
Paiva, Afonso de Moraes
Title in Portuguese
Oscilações Subinerciais na Plataforma Continental Sudeste: Estudos Numéricos
Keywords in Portuguese
Frentes Frias
Ondas de Plataforma Continental
Oscilações Subinerciais
Plataforma Continental Sudeste
Abstract in Portuguese
Oscilações subinerciais da elevação da superfície livre do mar na Plataforma Continental Sudeste (PCSE) foram estudadas por meio de modelagem numérica computacional. Os campos atmosféricos utilizados nos experimentos foram obtidos da reanálise NCEP-DOE AMIP II e o modelo hidrodinâmico DELFT-3D Flow foi empregado. A validação dos resultados dos experimentos numéricos foi realizada por comparação com observações. Foram realizadas simulações para o verão de 2003, para o inverno de 2004 e para mais quatro cenários de ventos sintéticos, simulando a propagação de frentes frias climatológicas (obtidas neste estudo). Verificamos que na porção sul (norte) da região passaram 3,6 (2,9) frentes frias por mês durante o inverno e 3,4 (1,3) durante o verão. Esta diferença entre as regiões norte e sul mostrou que alguns eventos não percorreram toda a região, sendo isso mais frequente no verão. A passagem de frentes frias provocou a propagação de oscilações subinerciais da superfície do mar, confinadas junto à costa, com comprimento de onda de aproximadamente 2000 km, duração de 50 h e amplitude média de 0,3 m, tanto no verão quanto no inverno. Nas simulações em que as frentes frias não percorreram toda a PCSE, oscilações subinerciais da superfície do mar também foram geradas e se propagaram para o norte com características semelhantes àquelas geradas pelas frentes frias que percorreram toda a PCSE. As oscilações subinerciais na região norte da PCSE estiveram melhor correlacionadas com a componente do vento perpendicular à costa da região de Paranaguá-Cananéia e com a componente do vento paralelo à costa da região de Imbituba-São Francisco. Forçantes externas à PCSE também excitaram oscilações subinerciais, principalmente com período superior a 7 dias. As oscilações subinerciais com períodos inferiores (superiores) a 7 (9) dias foram geradas desde o extremo sul (ao sul) da Plataforma Continental Sudeste até a região de Cananéia-Paranaguá e contribuíram com cerca de 40% (12%) da variância subinercial. As oscilações subinerciais analisadas tiveram características de Ondas de Plataforma Continental.
Title in English
Subinertial Oscillations in the South Brazil Bight: Numerical Studies
Keywords in English
Cold Fronts
Continental Shelf Waves
South Brazil Bight
Subinertial Oscillations
Abstract in English
The subinertial oscillations of the sea level in the South Brazil Bight (SBB) were studied using computational numerical models. The atmospheric fields used in the experiments were obtained from the NCEP-DOE AMIP II reanalysis and the DELFT-3D hydrodynamic model was used. The validation of the numerical experiments results was conducted by comparison with observations. Simulations were conducted for the summer 2003, for the winter 2004 and for other four scenarios with synthetic winds, simulating the cold fronts propagation (attained in this study). We verified that in the south (north) part of the SBB there were 3.6 (2.9) passing through during the winter and 3.4 (1.3) during summer. This difference between the south and north SBB regions showed that part of the events did not cover the whole SBB, being this more frequent during the summer. The cold front passages excited the propagation of subinertial sea level oscillations, trapped along the coastline, with approximately 2000 km of wavelength, 50 h of duration and 0.3 m of mean amplitude, both in the summer and in the winter. In the simulations in that the cold fronts did not pass through the whole SBB, sea level subinertial oscillations were also generated and propagated towards north with characteristics similar to the ones generated by the cold fronts that passed through the whole SBB. The subinertial oscillations in the north part of the SBB were better correlated with the wind component perpendicular to the coastline in the Paranaguá-Cananéia region and with the wind component parallel to the coastline in the Imbituba-São Francisco region. Forcing external to the SBB also excited subinertial oscillations, specially with periods higher than 7 days. Subinertial oscillations with periods lower (higher) than 7 (9) days were generated from the south boundary of the SBB (south of the SBB) to the Cananéia-Paranaguá region and contributed with approximately 40% (12%) of the subinertial variance. The subinertial oscillations analyzed had characteristics of Continental Shelf Waves.
 
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Publishing Date
2015-03-13
 
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