A corrente do Brasil ao largo da costa leste brasileira

Silveira, Ilson Carlos Almeida da; Schmidt, A.; Campos, Edmo; Godói, Sueli Susana de; Ikeda, Yoshimine

doi:10.1590/s1413-77392000000200008

Cited by 340 publications

(345 citation statements)

References 26 publications

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“…The Cabo Frio upwelling is seasonal (stronger during summer) with predominant North and Northeast winds (Silveira et al, 2000). According to Castro and Miranda (1998), the SACW intrusion is associated with meanders and eddies from the Brazil Current.…”

Section: Discussionmentioning

confidence: 97%

Population biology of the commercially exploited shrimp Artemesia longinaris (Decapoda: Penaeidae) in an upwelling region in the Western Atlantic: comparisons at different latitudes

et al. 2015

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This study characterized the population biology of the dendrobranchiate penaeid shrimp Artemesia longinaris Spence Bate, 1888, focusing on population structure, sexual maturity, reproductive period and recruitment, and comparing reproductive parameters of a different populations along western South Atlantic..Samples were collected monthly from March, 2008 to February, 2010 in Macaé, northern coast of Rio de Janeiro State, Brazil, a region influenced by the Cabo Frio upwelling. There was a significantly higher percentage of females and with larger sizes than males. Both carapace length and sexual maturity in Macaé were similar to the dimensions found in populations in the South of the continent (Argentina). Reproductive females were present in all months, with main peaks during winter and summer. Recruitment was also continuous, with peaks, usually one to two months after the appearance of reproductive females, after the reduction of the bottom temperature values of water. These data suggest that November to January would be the appropriate months for legal off-season, due to the higher intensity of spawning females and juveniles during this period. A comparação latitudinal dos parâmetros reprodutivos, não confirma o paradigma de que tamanho do corpo e a maturidade sexual das fêmeas são menores em regiões tropicais e aumentam em direção às maiores latitudes, reforçando a hipótese da influência e importância da ACAS na dinâmica reprodutiva de A. longinaris na região The results of this study contribute to the understanding of the biology of A. longinaris, and could also be a reference to monitor this important fishery resource and consequent legal off-season. Furthermore, this population located at the northern limit of the species distribution is a source of highly relevant comparison for population studies in other areas.Keywords: Dendrobranchiata, sex ratio, recruitment, reproductive biology, shrimp fishery. Biologia populacional do camarão explorado comercialmente

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Section: Discussionmentioning

confidence: 97%

Population biology of the commercially exploited shrimp Artemesia longinaris (Decapoda: Penaeidae) in an upwelling region in the Western Atlantic: comparisons at different latitudes

et al. 2015

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“…There are two types of upwelling in the southeastern Brazilian Continental Margin (Palma & Matano, 2009): the coastal upwelling near Cabo Frio, which is intensifi ed in the summer due to the action of NE winds, and the shelf break upwelling that operates all the year. In the studied area, the SACW constitutes the main source of nutrients, due to the shoaling of the nutricline induced by the NE winds or by the upwelling in cyclonic eddies formed in the BC at the shelf break (Silveira et al, 2000).…”

Section: Modern Oceanography Of the Study Areamentioning

confidence: 99%

The productivity history in the southwestern Atlantic as inferred from coccolithophore record for the last 130 kyr

Leonhardt¹,

Toledo

Coimbra

2013

rev. bras. paleontol.

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-In this work, fossil assemblages of coccolithophorids, oxygen stable isotopes (Globigerinoides ruber), and radiocarbon dating were used as proxies. The sediment core, obtained on the slope of Campos Basin, was analyzed, comprising the last 130 kyr. The results show that placolith-bearing taxa, such as Gephyrocapsa spp. and Emiliania huxleyi, as well as Florisphaera profunda, which inhabits the lower photic zone, dominated the assemblage during the whole study interval. Over the past 130 kyr, there was a relationship between productivity (based on N ratio) and climate cyclicity. In a general way, it can be said that sensu stricto interglacial stages (MIS 5e and the Holocene) showed low productivity, while the others (MIS 5d-a, 4, 3 and 2) had large fl uctuations. During interglacial-like conditions, a northward shift in the Intertropical Convergence Zone position would take place, along with a weakening of the NE winds associated with the Southern Atlantic Subtropical High and a weakening of the Brazil Current, leading to the maintenance of the water stratifi cation. On the other hand, during glacial-like conditions, the inverse conditions would be favorable to a shallower nutricline, increasing productivity in surface waters. Maximum productivity is achieved between 14-6.5 ky (during deglaciation), which could be a refl ection of the events of the Last Glacial Maximum.Key words: paleoceanography, coccolithophorids, productivity, Quaternary, Southwestern Atlantic.RESUMO -Neste trabalho, assembleias fósseis de cocolitoforídeos, isótopos estáveis de oxigênio (Globigerinoides ruber) e datações radiocarbônicas foram usados como proxies. Um testemunho sedimentar obtido no talude da bacia de Campos foi analisado, compreendendo os últimos 130 ka. Os resultados mostram que táxons placolitoformes, como Gephyrocapsa spp. e Emiliania huxleyi, bem como Florisphaera profunda, que habita a zona fótica inferior, dominam a assembleia durante todo o intervalo estudado. Ao longo dos últimos 130 ka há uma relação entre a produtividade (baseada na razão N) e a ciclicidade climática. De uma maneira geral, pode ser dito que estágios interglaciais sensu stricto (EIM 5e e o Holoceno) mostraram baixa produtividade, enquanto os outros (EIM 5d-a, 4, 3 e 2) apresentaram grandes fl utuações. Durante condições do tipo interglacial, uma migração para o norte da posição da Zona de Convergência Intertropical, juntamente com um enfraquecimento dos ventos de nordeste associados à Alta Subtropical do Atlântico Sul e um enfraquecimento da Corrente do Brasil, possivelmente levava à manutenção da estratifi cação das águas. Por outro lado, durante condições do tipo glacial, as condições inversas favoreceriam uma nutriclina mais rasa, aumentando a produtividade das águas superfi ciais. O máximo de produtividade foi registrado entre 14-6,5 ka (durante a deglaciação), o que pode ser um refl exo de eventos do Último Máximo Glacial.Palavras-chave: paleoceanografi a, cocolitoforídeos, produtividade, Quaternário, Atlântico Sudoeste.

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“…These properties indicate the influence of SACW identified in the bottom by temperatures below 20 o C and salinities in the range of 34.6 to 36.2. 42 The plot of salinity against temperature for C1 and C2 can be seen in Supplementary Information Figure S1. The current intensity and direction is shown in Figure 3.…”

Section: Characterization Of the Water Column And Physicochemical Promentioning

confidence: 99%

Estuary Adjacent to a Megalopolis as Potential Disrupter of Carbon and Nutrient Budgets in the Coastal Ocean

Lazzari¹,

Wagener²,

Farias³

et al. 2016

Journal of the Brazilian Chemical Society

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The goals were to estimate nutrients and carbon flow rates between Guanabara Bay and the adjacent coastal waters, to characterize the provenance of the exported/imported organic matter. Samples were collected from different depths over 25 h in two seasons at the bay entrance. Measurements included physicochemical parameters, nutrients, chlorophylls, dissolved organic carbon (DOC), particulate organic carbon (POC), particulate nitrogen (PN), carbon (d 13 C) and nitrogen (d 15 N) isotopic composition, sterols in suspended particulate matter (SPM) and bacterioplankton. Most variables showed higher values in ebb tide events. The flow rates calculated on daily basis and estimated on annual basis revealed the exportation to the continental shelf of 1.27 × 10 4 kmol year -1 dissolved inorganic nitrogen (DIN), 9.52 × 10 2 kmol year -1 dissolved inorganic phosphorus (DIP), 2.65 × 10 4 t year -1 DOC, 1.96 × 10 4 t year -1 POC, and 2.96 × 10 4 t year -1 PN. The estimates show the bay contributes with 0.01% of the total global carbon influx to the ocean.

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A corrente do Brasil ao largo da costa leste brasileira

Cited by 340 publications

References 26 publications

Population biology of the commercially exploited shrimp Artemesia longinaris (Decapoda: Penaeidae) in an upwelling region in the Western Atlantic: comparisons at different latitudes

Population biology of the commercially exploited shrimp Artemesia longinaris (Decapoda: Penaeidae) in an upwelling region in the Western Atlantic: comparisons at different latitudes

The productivity history in the southwestern Atlantic as inferred from coccolithophore record for the last 130 kyr

Estuary Adjacent to a Megalopolis as Potential Disrupter of Carbon and Nutrient Budgets in the Coastal Ocean

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