A Recirculação Interna do Giro Subtropical do Atlântico Sul e a Circulação Oceânica na Região do Pólo Pré-sal da Bacia de Santos

Belo, Wellington Ceccopieri

doi:10.11606/t.21.2011.tde-20042012-152310

Cited by 5 publications

(6 citation statements)

References 92 publications

(218 reference statements)

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“…The principal differences between the two runs, within the Metarea V domain, are the intensification of the ocean currents and the appearance of mesoscale features with increased model resolution. One signature of the mesoscale variability in the mean SSH field of Figure Belo (2011), while the southernmost one appears to be a spurious, or at least an over intensified feature of the 1/12 degree model run. Preliminary analysis suggests that it is associated with the local bathymetry, and further studies are needed in order to understand its dynamics in the model.…”

Section: The Mean Flow and Mass Structurementioning

confidence: 94%

Modeling the South Atlantic Ocean From Medium to High-Resolution

Gabioux¹,

Costa²,

Souza³

et al. 2013

Braz J Geophys

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ABSTRACT. The standard REMO (a Brazilian approach towards operational oceanography) model configuration is tested, and results of two numerical simulations with HYCOM are presented and discussed. This configuration consists basically of a high-resolution eddy-resolving, 1/12 degree model for the Metarea V (latitudes from 7◦N to 35◦50’S, and longitudes between 20◦W and the Brazilian coast), nested in a medium-resolution eddy-permitting, 1/4 degree model of the Atlantic Ocean. These simulations aim for: a) creating a basic set-up for implementation of assimilation techniques leading to ocean prediction; b) the development of hydrodynamic bases for environmental studies; and c) providing boundary conditions for regional domains with increased resolution. This is the first time HYCOM is applied in high-resolution and particularly tailored for this region of the ocean. The 1/4 degree simulation was able to simulate realistic Equatorial and South Atlantic large scale circulation, both the wind-driven and the thermohaline components. The high-resolution introduces realistic mesoscale activity, in particular that associated with the dynamics of western boundary currents, and captures also both the continental shelf and the upper-ocean modes of variability associated with atmospheric synoptic forcing. Important issues for the simulation of the South Atlantic with high-resolution are discussed, like the ideal place for boundaries, improvements in the bathymetric representation, and the control of SST bias by the introduction of surface relaxation. In order to make a preliminary assessment of the model behavior when submitted to data assimilation, the Cooper & Haines (1996) method was used to extrapolate SSH anomalies fields to deeper layers every 7 days, with encouraging results.Keywords: numerical simulation, nesting, southwest Atlantic, Brazil Current. RESUMO. Neste trabalho são apresentados e discutidos resultados de duas simulações numéricas realizadas com o model HYCOM e que representam a configuração padrão do projeto REMO (Rede de Modelagem e Observação Oceanográfica), uma abordagem brasileira para a oceanografia operacional. Esta configuração consiste em um modelo em alta resolução (1/12 de grau, que resolve a mesoescala) da região denominada de Metarea V (latitudes de 7◦N a 35◦50’S e longitudes desde 20◦W até a costa brasileira), aninhado em um modelo em média-resolução (1/4 de grau, que resolve apenas parcialmente a mesoescala) do oceano Atlântico. Estas simulações tem como objetivos: a) a geração de um set-up básico para implementação de técnicas de assimilação visando a previsão oceânica; b) o desenvolvimento de bases hidrodinâmicas para estudos ambientais; e c) a geração de condições de contorno para domínios regionais com maior resolução. Esta é a primeira vez que o HYCOM é aplicado em alta resolução e especialmente configurado para esta região do oceano. A simulação em 1/4 de grau simulou de forma realista a circulação de larga escala no Atlântico Sul e Equatorial, tanto a componente eólica quanto a termohalina. A simulação em alta resolução foi capaz de introduzir também de forma realista a mesoescala, em particular aquela associada à dinâmica das correntes de contorno oeste, e de capturar a variabilidade da porção superior do oceano e da plataforma continental associada à forçante atmosférica em escala sinótica. Aspectos importantes para a simulação do Atlântico Sul em alta resolução são discutidos, como o posicionamento dos contornos, a representação da batimetria e o controle de possíveis tendências na TSM pela introdução de um termo de relaxamento para climatologia em superfície. Uma avaliação preliminar do comportamento do modelo submetido à assimilação de dados foi realizada com o método de Cooper & Haines (1996), capaz de extrapolar campos de anomalias de elevação da superfície para camadas mais profundas a cada 7 dias, com resultados promissores.Palavras-chave: simulação numérica, aninhamento, Atlântico sudoeste, Corrente do Brasil.

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Section: The Mean Flow and Mass Structurementioning

confidence: 94%

Modeling the South Atlantic Ocean From Medium to High-Resolution

Gabioux¹,

Costa²,

Souza³

et al. 2013

Braz J Geophys

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“…During this period, one measured profile (socalled P12 -red line) is verified with a more pronounced variation in the sound velocity and temperature along the upper region (first 700 m), in comparison with the others. Analysis of satellite altimeter data suggests an association with cold cyclonic eddies (BELO, 2011).…”

Section: Ocean Datamentioning

confidence: 99%

Parameterized water layer reconstruction for first arrivals in OBN data

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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In this work we present current results for an ongoing formulation of an inversion method focused on water velocity reconstruction of Ocean Bottom Nodes (OBN) data, based strictly on the varying behavior of first arrivals with the source offset distance.Given the similarities with the field of Oceanic Acoustic Tomography (OAT), some typical assumptions applied to the acoustic propagation on the ocean environment, such as the linearized disturbances of the sound velocity, are here enforced. Additionally, two sets of available oceanographic information, that can be known a priori for a certain region of interest, are considered: 1) monthly-averaged sound velocity profiles from reanalysis models, and 2) a parameterized set of modes to describe velocity disturbances.Our results are verified to provide improved water velocity reconstructions over a verticallyhomogeneous profile, which is typically considered in geophysical imaging.

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“…The retroflection lobe can be also interpreted as larger inner Recirculation Cell (RC) centered in ∼ 35 • S. This RC is elliptical in shape and its northern border can reach as north 32 • S. Its western border forms a counterflow to west of ∼ 53 • W and which recirculates part of the BC re-entering the main current at the RC northern tip latitude (Gordon and Greengrove, 1986;Stramma and England, 1999;Vianna et al, 2007;Schmid, 2014). The relative small size of the RC has been attributed to a possible double-subgyre system proposed by Tsuchiya (1985) (from hydrography) and Vianna et al (2007) (from altimetry and gravimetry): one centered in in ∼ 22 • S and the other centered in ∼ 32 • S (Tsuchiya, 1985;Belo, 2011). The RC described here can be thought as the inner recirculation portion of the southern subgyre.…”

Section: Descriptionmentioning

confidence: 99%

Mesoscale variability of the Brazil Current in the Santos Bight: is it locally or remotely forced?

Almeida¹

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A Recirculação Interna do Giro Subtropical do Atlântico Sul e a Circulação Oceânica na Região do Pólo Pré-sal da Bacia de Santos

Cited by 5 publications

References 92 publications

Modeling the South Atlantic Ocean From Medium to High-Resolution

Modeling the South Atlantic Ocean From Medium to High-Resolution

Parameterized water layer reconstruction for first arrivals in OBN data

Mesoscale variability of the Brazil Current in the Santos Bight: is it locally or remotely forced?

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