High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic

Silva, Marcus André; Araújo, Moacyr; Servain, Jacques; Penven, Pierrick; Lentini, Carlos A. D.

doi:10.1016/j.ocemod.2009.07.002

Cited by 61 publications

(67 citation statements)

References 66 publications

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“…Meanwhile, subsurface salinity values are relatively high due to the presence of NBUC, whose equatorward transport increases during this period, as stated by Rodrigues et al (2007) and Silva et al (2009). For that reason, isothermal layer deepens and low surface salinity values induce shallow mixed layer resulting in thick BLs in the southern study area (south of 8 • S).…”

Section: Winter Barrier Layersmentioning

confidence: 68%

“…The difference between the late winter and summer periods relies on computed values of mixed layer depths from the latter, with Z M not exceeding 50 m. These shallow mixed layers are due to the near-surface intrusion of salty SAW (Fig. 3b), which is transported westward from subtropical regions by the intensified SEC flow verified during this period (Rodrigues et al, 2007;Silva et al, 2009). Consequently, high BLT values during austral summer are not only concentrated in the southernmost part of the study area, as observed during late winter (Fig.…”

Section: Summer Barrier Layersmentioning

confidence: 97%

“…Moreover, this region is subjected to cyclonic and anticyclonic gyres strongly controlled by surface winds (Stramma and Schott, 1999;Lumpkin and Garzoli, 2005). These gyres drive the divergence of the southern pathway of the South Equatorial Current (sSEC) (Rodrigues et al, 2007;Silva et al, 2009), which is partially at the birth site of several current systems that flow along the Brazilian coastline. The northern branch of the sSEC termination flows northward, forming the North Brazil Current/North Brazil Undercurrent (NBC/NBUC) system.…”

Section: Introductionmentioning

confidence: 99%

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Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

et al. 2011

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Section: Winter Barrier Layersmentioning

confidence: 68%

Section: Summer Barrier Layersmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

et al. 2011

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“…Surface temperature is approximately 28 °C, with permanent thermocline as of 100 m (SCHOTT et al, 2005;SILVA et al, 2009). These values of salinity and temperature are characteristic of Tropical Water.…”

Section: Study Areamentioning

confidence: 95%

Hydrography and currents on the Pernambuco Continental Shelf

Domingues

Schettini

Truccolo

et al. 2017

RBRH

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The present study presents the seasonal hydrography and currents of the Brazilian Northeast Continental Shelf. The study area is located on the Brazilian tropical coast of the Atlantic Ocean between 7.5 and 9 °S. This continental shelf is narrow (~35 km wide) and shallow, with shelf break lying at a depth of 60 m. Salinity and temperature data were collected monthly by means of hydrographic surveys, conducted across the shelf in a single transect in the central part of the study area, between March 2012 and May 2013. Two further campaigns were also conducted to characterize the winter (August 2013) and the summer (January 2014), covering the whole study area (4,600 km 2 ). Water level and currents were measured using an array of Acoustic Doppler Current Profilers (ADCP) moored at mid-shelf in the central area. Seasonal temperature ranged from 26 °C in September to 29.5 °C in April, with a 2-month lag between the minimum and maximum air temperatures. Salinity did not present a clear seasonal pattern, fluctuating between 36.5 and 37.0 psu throughout the year. The mean temperature and salinity values obtained in the winter and summer campaigns were 26.5 and 27.6 °C and 37.1 and 36.7 psu, respectively. Tropical Water (TW) was predominant, accounting for 95% to 97%, with presence of Coastal Water (CW) limited to the inner part of the shelf. The mean flow velocity values in the water column in winter and summer were 0.11 and 0.06 m/s, respectively, similarly to the seasonal wind regime. Northward currents were observed predominantly in winter, with a short period of inverted southward current. These episodes were related to periods of wind relaxation and presented periodicity of 6-13 days, observed through wavelet analysis. This periodicity may be associated with atmospheric instabilities at higher latitudes. Summer currents were sluggish, when the tides accounted for 75 and 43% of the variance in the cross-and along-shelf current components, respectively. TW is the main water mass in the Pernambuco Continental Shelf (PCS) in summer and winter. Current intensity is weak and without direction in summer and stronger towards the north in winter.Keywords: Water masses; Circulation; Brazilian Northeast Shelf. RESUMOEste trabalho apresenta a descrição sazonal da hidrografia e hidrodinâmica de uma plataforma continental localizada na borda oeste do Atlântico tropical, a área de estudo encontra-se entre as latitudes de 7,5 e 9 °S, possui apenas 35 km de largura e 187 km de extensão, com a quebra de plataforma em 60m de profundidade. A salinidade e temperatura foram coletadas em campanhas hidrográficas mensalmente entre março de 2012 e maio 2013 por meio de transectos na região central da área de estudo. Também, duas campanhas foram realizadas, uma para caracterizar o inverno (Agosto de 2013) e outra o verão (janeiro de 2014) cobrindo toda a área de estudo (4600 km 2 ). O nível da água e correntes também foram coletados com um Perfilado Acústico por efeito Doppler (ADCP) fundeado na região central da área de estudo. A ...

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“…This impact was exclusively due to the SLA assimilation, since there was no difference between A_SLA and A_TS_SLA results at this specific location. The change in the position is towards the observation around 10°S from Stramma et al (1990) and model results from Silva et al (2009) and Rodrigues et al (2007), who indicated 8°S -13°S and 10°S-14°S, respectively, considering the interannual variability. For the 100 m depth (not shown), the BiSEC is at 18°S according to the control run and at 16°S according to the two assimilations runs.…”

Section: Resultsmentioning

confidence: 57%

Assimilation of sea-level anomalies and Argo data into HYCOM and its impact on the 24 hour forecasts in the western tropical and South Atlantic

Costa

Tanajura

2015

Journal of Operational Oceanography

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Argo and along-track sea-level anomaly (SLA) data from satellites were assimilated into the Hybrid Coordinate Ocean Model in the western tropical and South Atlantic Ocean. An optimal interpolation method was employed in the assimilation, and the Cooper and Haines scheme projected the altimetry information into the subsurface. The run with assimilation of SLA and Argo data reduced the root mean square deviation of the 24 h forecasts of SLA, sea surface temperature, and subsurface temperature and salinity by 21.4%, 11.5%, 28.1%, and 15.8%, respectively, with respect to the control run without assimilation. Important improvements were also observed in the circulation.

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High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic

Cited by 61 publications

References 66 publications

Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

Hydrography and currents on the Pernambuco Continental Shelf

Assimilation of sea-level anomalies and Argo data into HYCOM and its impact on the 24 hour forecasts in the western tropical and South Atlantic

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