A circulação oceânica de larga-escala na região oeste do Atlântico Sul com base no modelo de circulação Global OCCAM

Cirano, Mauro; Mata, Maurício M.; Campos, Edmo; Deiró, Núbia F. R.

doi:10.1590/s0102-261x2006000200005

Cited by 66 publications

(48 citation statements)

References 11 publications

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“…The high number of migrants per generation can hardly be explained by occasional adult migration, which might suggest that larval migration plays a role in these species. Asymmetric migration toward the south was observed in O. evelinae, from OvFB to OvVN and from OvVN to OvFl, which is consistent with the major currents along the Brazilian coast (Cirano et al 2006; Fig. 1).…”

Section: Larval Dispersal In Ototyphlonemertes?supporting

confidence: 81%

Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)

2011

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Understanding the evolutionary processes from recent demographic history is especially difficult for interstitial organisms due to their poorly known natural history. In this study, the genetic variation and population history of the four Ototyphlonemertes (Diesing in Sitz ber Math Nat Kl Akad Wiss Wien 46:413-416, 1863) species were evaluated from samples collected along the Brazilian coast (between 27°31 0 S and 13°00 0 W) in 2006. The mitochondrial region cytochrome c oxidase subunit 3 (COX3) is analyzed to assess the genetic variation of these dioecious species. Although these species have a sympatric distribution along the coast, our data suggest that their levels of differentiation and their demographic histories differ sharply. There is strong evidence of gene flow among demes in O. erneba and O. evelinae, and their level of structuring is much lower than for the other two species. Indeed, the COX3 fragment reveals cryptic lineages in O. lactea and O. parmula. The results seem to contradict the high genetic structuring and low intrapopulational variability expected with the ecological constriction and habitat discontinuity faced by these organisms, meaning that there might be gene flow among populations or their dispersal capability has been underestimated.

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Section: Larval Dispersal In Ototyphlonemertes?supporting

confidence: 81%

Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)

2011

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“…For example, it varies from 12°S at 100 m depth to 20°S at the 500 m depth (Figure 3.9). These results corroborate some recent works such as Cirano et al (2006) and Rodrigues et al (2007) and confirm that the ROMS model can represent the dynamic of the western boundary of the South Atlantic. The bifurcation of the SEC is defined here as where the meridional transport from the continental slope is zero.…”

Section: Veleda D R a Et Al Seasonal And Interannual Variabilitysupporting

confidence: 92%

“…The alongshore current are reverse northernmost at about 17°S in October and November while the southernmost reverse of currents is from March to July at about 19°S. These fields are important to confirm the depth dependence of the bifurcation of the sSEC, as such as in Rodrigues et al (2007) and Cirano et al (2006), as well in ROMS model results in this work (Figures 3.7,3.8 and 3.9). Such as in ROMS results, the bifurcation of the sSEC is defined here as where the meridional transport from the continental slope is zero.…”

Section: Climatology Of the Soda Reanalysissupporting

confidence: 79%

“…According with Stramma and England (1999) the northern limb of the gyre, or the sSEC in the near-surface layer, reaches the shelf of Brazil near 16°S and separates into the southward flow of the Brazil Current and at subsurface into the northward flow of the NBUC while in the Central Water layer the sSEC reaches the Brazilian continent at about 20°S and in the AAIW the sSEC reaches the shelf at about 26°S. Cirano et al (2006) found a depth dependence of the sSEC bifurcation; they used the OCCAM from Ocean Circulation and Climate Advanced Modeling Project. Their results indicate that the model is capable of representing the southward zonal migration of the sSEC with the increase of depth.…”

Section: Veleda D R a Et Al Seasonal And Interannual Variabilitymentioning

confidence: 99%

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Seasonal and interannual variability of the southern south Equatorial Current bifurcation and meridional transport along the eastern brazilian edge.

Veleda¹,

Araújo²,

Silva³

et al. 2011

TropOcean

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The dynamics of the southern band of the South Equatorial Current (sSEC) near to Brazilian shelf is investigated using recent field observations and a regional numerical modeling approach. The field measurements were obtained from five moorings deployed by German CLIVAR (Climate Variability and Predictability Program) cruises (March 2000-August 2004) along a crossshore line at 11oS. The Regional Ocean Model (ROMS) is used to simulate the circulation and thermohaline structures within the ocean area comprised between 5°S-25°S and 20°W-47°W. This integration domain was covered by an isotropic 1/12o horizontal grid and 40 terrain-following layers. The numerical results confirm a seasonal migration of the sSEC divergence along the Brazilian edge, as well as its depth dependence with a maximum southward shift in July at 200 m depth, while a maximum northward displacement occurs in November at this same depth. This intrannual variability coincides with the North Brazil Undercurrent (NBUC) seasonality at 11oS from moorings measurements. Empirical Orthogonal Function (EOF) and numerical results show a minimum NBUC strength during November and a maximum northward transport in July. The mean transport from field measurements is 25Sv while this from numerical simulations is 24.5Sv. The SODA reanalysis with 47 years of monthly mean indicates that the sSEC has not only a seasonal variability as well as quasi-biannual variability.

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“…According to Silveira et al (2000a) and Soutelino (2008) the BC originates at the latitude of 10 • S from the bifurcation of South Equatorial Current (SEC) and then flows southward. According to Cirano et al (2006), the BC is very shallow at lower latitudes and deepens as it flows poleward. Rodrigues et al (2006) showed that the SEC bifurcation presents latitudinal migrations due to variation in the wind stress intensity, which result in seasonal variations in the BC volume and mass transports.…”

Section: Study Areamentioning

confidence: 99%

Oil spill modeling off the Brazilian eastern coast: the effect of tidal currents on oil fate

Lemos¹,

Soares²,

Ghisolfi³

et al. 2009

Rev. Bras. Geof.

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ABSTRACT. This study presents a comparative analysis of several theoretical oil spill scenarios occurring in the vicinity of the Abrolhos Reefs, a preservation area located off the Brazilian east coast. The following petroleum blocks were considered in the study: BM-CUM-1, BM-CUM-2, J-M-259 and ES-M-418, to verify the effect of the tide on the oil spreading on the continental shelf in the eastern Brazilian. The probabilistic oil spill simulations were carried out for 30 days and considered an oil of intermediate API (American Petroleum Institute) type. The simulations were performed by the OSCAR (Oil Spill Contingency and Response) model which was fed by synoptic wind data and hydrodynamic data simulated by the POM (Princeton Ocean Model) model. Two distinct seasonal scenarios were studied: the austral winter and the austral summer of 1989 and the results were discussed in terms of seasonal variability caused by the winter/summer winds and differences in mesoscale instabilities.The effect caused by tidal currents was analyzed through the comparison between simulations with and without the tides. It was concluded that the tide strongly influenced foram discutidos em termos das variações de intensidade e direção do espalhamento causado pelo vento sinótico de cada estação, assim como pelos processos de mesoescala e pela maré. O efeito causado pela maré foi analisado através da comparação de simulações com e sem maré. Concluiu-se que a maré influenciou fortemente nos resultados probabilísticos de destino doóleo nos cenários de derramamento. Muitos fatores mostraram influenciar nesse destino do espalhamento doóleo com a ausência dos processos supra-inerciais, como a localização geográfica do derramamento, os ventos predominantes e o comportamento da maré na região. A ausência da maré nos dados hidrodinâmicos não permitiu encontrar os cenários de pior caso de derramamento em simulações nos blocos BM-CUM-1, BM-CUM-2 e J-M-259, principalmente no verão com a utilização deóleo intermediário, subestimando os cenários reais de derramamento.Palavras-chave: marés, modelagem,óleo, POM, OSCAR.

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A circulação oceânica de larga-escala na região oeste do Atlântico Sul com base no modelo de circulação Global OCCAM

Cited by 66 publications

References 11 publications

Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)

Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)

Seasonal and interannual variability of the southern south Equatorial Current bifurcation and meridional transport along the eastern brazilian edge.

Oil spill modeling off the Brazilian eastern coast: the effect of tidal currents on oil fate

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