Methods for estimating the velocities of the Brazil Current in the pre-salt reservoir area off southeast Brazil (23∘ S–26∘ S)

Biló, Tiago Carrilho; Silveira, Ilson Carlos Almeida da; Belo, Wellington Ceccopieri; Castro, Belmiro Mendes de; Piola, Alberto R.

doi:10.1007/s10236-014-0761-2

Cited by 50 publications

(76 citation statements)

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“…The lowest in SSH is around the ABFZ and reaches the southwestern African coast. The high in SSH in the southwestern Atlantic is at the centre of the subtropical gyre with the Brazil Current at its western side (e.g., Bilo et al 2014). In NorESM, however, the lowest SSH in the ABFZ seems to be displaced southward because the SSH bias is negative south of the ABFZ and positive north of it.…”

Section: Noresm Tropical Atlantic Sst Biasesmentioning

confidence: 95%

Causes of the large warm bias in the Angola–Benguela Frontal Zone in the Norwegian Earth System Model

et al. 2017

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simulation). There is no evidence that local air-sea feedbacks among wind stress curl, SST, and sea level pressure (SLP) affect the ABFZ SST bias. Turbulent surface heat flux differences between coupled and uncoupled experiments explain the remaining 2 °C warm SST bias in NorESM. Ocean circulation, upwelling and turbulent heat flux errors all modulate the intensity and the seasonality of the ABFZ errors.

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Section: Noresm Tropical Atlantic Sst Biasesmentioning

confidence: 95%

Causes of the large warm bias in the Angola–Benguela Frontal Zone in the Norwegian Earth System Model

et al. 2017

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“…Despite its relatively low maximum velocity, the BC system is associated with intense mesoscale activity, particularly in the BrazilMalvinas Confluence region, exhibiting strong year-to-year variability (Goni et al 2011), shedding of large anticyclonic rings (Lentini et al 2006), and possible contributing to the low frequency variability of the South Atlantic meridional heat transport (Dong et al 2015). Near Cabo Frio (23°S), most of the studies of the BC volume transport have relied upon geostrophic computations (e.g., Signorini 1978;Campos et al 1995;Silveira et al 2000;Mata et al 2012;Biló et al 2014). Although these works are based on the use of different reference levels, results indicate that most of the BC geostrophic transport is confined to the first 200 m of the water column, and meanders and eddies were captured close to Cabo Frio (23°S).…”

Section: Introductionmentioning

confidence: 99%

An assessment of the Brazil Current baroclinic structure and variability near 22° S in Distinct Ocean Forecasting and Analysis Systems

et al. 2016

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The Brazil Current (BC) is the Western Boundary Current of the South Atlantic subtropical gyre, the dominant dynamic feature in the South Atlantic Ocean. The importance of this current lies in that it is the main conduit of subtropical waters to higher latitudes in the South Atlantic Ocean. This study assesses the structure and variability of the BC across the nominal latitude of 22°S using data from the high-density eXpendable BathyThermograph (XBT) AX97 transect and from three numerical ocean models with data assimilation. This XBT transect was implemented in 2004 and represents one of the longer-term monitoring systems of the BC in existence. The goal of this work is to enhance the understanding of the temporal and spatial variability of the ocean dynamics in the southwestern South Atlantic Ocean by using a suite of hydrographic observations and numerical model outputs. In the present work, 37 XBT transect realizations using data collected between 2004 and 2012 are used. Daily outputs covering the same time period are evaluated from Hybrid Coordinate Ocean Model with the Navy Coupled Ocean Data Assimilation (HYCOM-NCODA) with a 1/12°horizontal resolution, and GLORYS2V3 and FOAM, both with a 1/4°horizontal resolution. These Ocean Forecasting and Analysis Systems (OFAS) are able to capture the mean observed features in the 22°S region, showing a BC core confined to the west of 39°W and an Intermediate Western Boundary Current between the depths of 200 and 800 m. However, the OFAS tend to overestimate the mean BC baroclinic volume transport across the AX97 reference transect and underestimate its variability. The OFAS show that the coastal region between the coastline and the western edge of the AX97 transect plays an important role in the mean BC total transport, contributing to up to 23 % of its value, and further that this transport is not sampled by the XBT observations with its current sampling strategy. In order to understand the variability of the BC, a statistical classification of the BC is proposed, with the identification of three different events: weak, intermediate, and strong.

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“…No cenário brasileiro as atividades da exploração de petróleo vêm crescendo de forma intensa e se direcionam cada vez mais para águas profundas, geralmente localizadas distante da costa (1) . Impulsionada pelas novas descobertas das reservas do pré-sal, a produção estimada de petróleo e gás no Brasil deve praticamente dobrar até 2020, com investimentos de US$ 236,5 bilhões no período entre 2012-2016 (2)(3)(4) .…”

Section: Introductionunclassified

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Santos

Maciel

Santana

2015

RBAV

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Concern for the environment has motivated several studies on the use of new materials to extend the life of equipment operating in harsh environments in the oil sector. One alternative that has been used is the application of coatings with high corrosion resistance welding process materials. The objective of this study was to evaluate the effects of different welding parameters on the geometric characteristics, dilution, microhardness, microstructure and corrosion resistance of the coatings with Inconel 625 alloy deposited on the API 5L X70 steel used in oil pipelines to transport plate. The parameters were optimized using the factorial statistical experimental design for analysis of process parameters, and the results analyzed by Response Surface Methodology (RSM). Three deposits were carried out ½ overwrite process GMAW (Gas Metal Arc Welding), followed by cross-sectional analysis of samples for the geometrical and metallographic characteristics. For the analysis corrosion, the coating surface being machined to have a height of 3 mm according to Standard N-1707 Petrobrás coating. The electrochemical behavior of the coating surface (Inconel 625) was investigated at room temperature in NaCl solution using the technique of linear potentiodynamic polarization and electrochemical impedance spectroscopy. To reveal the corrosion resistance of the coatings, featuring some important parameters were considered, such as: the polarization resistance (Rp) and the corrosion potential (Ecorr). The results showed dilution values D (%) ranging from 12.77% to 24.88% in the maximum levels (18.99 KJ/cm) and minimum (8.34 KJ/cm) welding power, and the amounts the most important of 12.77%. As to the corrosion resistance, the results were more satisfactory for the highest level of welding power.Keywords: GMAW; Coating; Corrosion. RESUMOA preocupação com o meio ambiente vem motivando diversas pesquisas sobre o uso de novos materiais para prolongar a vida útil de equipamentos que operam em ambientes agressivos no setor de petróleo. Uma das alternativas que vem sendo utilizada é a aplicação de revestimentos com materiais de alta resistência à corrosão por processo de soldagem. Objetivou-se neste estudo avaliar os efeitos dos diferentes parâmetros de soldagem sobre as características geométricas, diluição, microdureza, microestrutura e resistência à corrosão dos revestimentos com liga Inconel 625 depositados sobre chapa do aço API 5L X70 utilizado em dutos para transporte de petróleo. Os parâmetros foram otimizados utilizando o planejamento experimental fatorial completo para analise dos parâmetros de processo, sendo os resultados analisados pela Metodologia de Superfície de Resposta (MSR). Foram realizados três depósitos com sobreposição de ½ por processo de soldagem GMAW (Gas metal arc welding), seguido de corte transversal das amostras para a analise das caraterísticas geométricas e metalograficas. Para as analises de corrosão, as superfície do revestimento foram usinadas ficando com uma altura de 3 mm de acordo com a norma N...

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Methods for estimating the velocities of the Brazil Current in the pre-salt reservoir area off southeast Brazil (23∘ S–26∘ S)

Cited by 50 publications

References 32 publications

Causes of the large warm bias in the Angola–Benguela Frontal Zone in the Norwegian Earth System Model

Causes of the large warm bias in the Angola–Benguela Frontal Zone in the Norwegian Earth System Model

An assessment of the Brazil Current baroclinic structure and variability near 22° S in Distinct Ocean Forecasting and Analysis Systems

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

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