Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf

Mahiques, Michel Michaelovitch de; Bı́cego, Márcia Caruso; Silveira, Ilson Carlos Almeida da; Sousa, Silvia Helena de Mello e; Lourenço, Rafael André; Fukumoto, Marina Midori

doi:10.1590/s0001-37652005000300013

Cited by 77 publications

(59 citation statements)

References 22 publications

(17 reference statements)

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“…The upwelling itself occurs when a prevailing northeasterly trade wind dominates in the region (Calado et al, 2008) as a result of a north-south to east-west change in the orientation of the South American shoreline. The intense and constant flow of the BC and NBC waters, accompanied by a relatively low volume of regional fluvial terrigenous sediment delivery, makes the Southwestern Atlantic coast a region of low sedimentation rates (Mahiques et al, 2005). Along the Southwestern Brazilian coast the BC occupies the top 200 m of the water column.…”

Section: Site Descriptionmentioning

confidence: 99%

South Tropical Atlantic anti-phase response to Holocene Bond Events

Evangelista¹,

Gurgel²,

Sifeddine³

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Records of the climatic impacts of the North Atlantic Bond cycles over the subtropical Southern Hemisphere remain scarce, and their mechanism is a topic of active discussion. We present here an alkenone-based reconstructed sea surface temperature (SST) of a sediment core retrieved from the Brazilian Southwestern Tropical Atlantic (SWTA), Rio de Janeiro, together with a sediment SST record from the Cariaco Basin. The sediment cores span the period 2,100 B.P. -11,100 B.P. Morlet-wavelet analysis detected marked periodic signals of~0.8,~1.7 and 2.2 kyr, very similar and with comparable phases to the hematite-stained-grain time series from the Northern North Atlantic in which the cyclic pattern was recognized as Bond cycles. Our result corroborates the modeled surface ocean anti-phase thermal relation between the North and the South Atlantic. We attribute this behavior to the slowing of the Atlantic Meridional Overturning Circulation. The relative SST warming at Rio de Janeiro and the relative cooling at Cariaco were comparatively more pronounced during the early Holocene (from 11 to 5 kyr B.P.) than in more recent time.

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Section: Site Descriptionmentioning

confidence: 99%

South Tropical Atlantic anti-phase response to Holocene Bond Events

Evangelista¹,

Gurgel²,

Sifeddine³

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…In the Cabo Frio system, Laslandes et al (2006) suggested that the influence of "El Niño" events has been increasing over the last four thousand years and upwelling processes must have been associated with the predominance of northeasterly winds for about the last 2,400 years. Moreover, climatic changes in the last 1,000 to 3,000 years could have intensified upwelling events during the last seven hundred years (MAHIQUES et al, 2005). It has been suggested that the upwelling events in the Benguela system started ten million years ago (SIESSER, 1980).…”

Section: Global Changes and Local Impactsmentioning

confidence: 99%

“…An increase in upwelling intensity has been suggested for the Canary (MCGREGOR et al, 2007) and Benguela systems and may be a function of the superficial Atlantic circulation (MARLOW et al, 2000). However, a rise in temperature and water level has been reported on the southwestern coast of the USA (ROEMMICH, 1992).…”

Section: Global Changes and Local Impactsmentioning

confidence: 99%

Biophysical interactions in the Cabo Frio upwelling system, southeastern Brazil

et al. 2012

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A B S T R A C TThe rising of cold water from deeper levels characterizes coastal upwelling systems. This flow makes nutrients available in the euphotic layer, which enhances phytoplankton production and growth. On the Brazilian coast, upwelling is most intense in the Cabo Frio region (RJ). The basic knowledge of this system was reviewed in accordance with concepts of biophysical interactions. The high frequency and amplitude of the prevailing winds are the main factor promoting the rise of South Atlantic Central Water, but meanders and eddies in the Brazil Current as well as local topography and coast line are also important. Upwelling events are common during spring/summer seasons. Primary biomass is exported by virtue of the water circulation and is also controlled by rapid zooplankton predation. Small pelagic fish regulate plankton growth and in their turn are preyed on by predatory fish. Sardine furnishes an important regional fish stock. Shoreline irregularities define the embayment formation of the Marine Extractive Reserve of Arraial do Cabo making it an area with evident different intensities of upwelled water that harbors high species diversity. Consequently, on a small spatial scale there are environments with tropical and subtropical features, a point to be explored as a particularity of this ecosystem. R E S U M OOs sistemas costeiros de ressurgência são caracterizados pela ascensão de águas frias que tornam os nutrientes disponíveis na camada eufótica para o crescimento e aumento da produção fitoplanctônica. No Brasil, a região do Cabo Frio (RJ) é o principal sistema de ressurgência costeira. O objetivo desse artigo foi revisar o atual conhecimento desse sistema através dos conceitos sobre interações biofísicas. A ascensão da Água Central do Atlântico Sul ocorre devido à alta frequência e amplitude dos ventos, à presença de meandros e vórtices na Corrente do Brasil, além da topografia local e da linha de costa. Os eventos de ressurgência são comuns durante os períodos de primavera/verão e a biomassa primária é exportada devido à circulação da água, sendo também controlada pela rápida predação zooplanctônica. Os pequenos peixes pelágicos regulam o crescimento do plâncton e são consumidos pelos peixes predadores, resultando em um importante estoque pesqueiro regional. A irregularidade da costa define as enseadas do Cabo Frio, na Reserva Extrativista Marinha do Arraial do Cabo, apresentando distintas influências das águas ressurgidas e resultando em grande diversidade de espécies. Consequentemente, ambientes com características tropicais e subtropicais são observados dentro de uma pequena escala espacial, o que constitui uma particularidade desse ecossistema.

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“…Discrete upwelling events may occur throughout the entire year but are more intense and frequent during the spring and summer months when a marked thermal dome forms just below the surface (reviewed by GUIMARAENS et al, 2005). Sedimentation rates in the upwelling zone of Cabo Frio range from 0.26 to 0.66 mm.year-1 (MAHIQUES et al, 2005). The non-upwelling period in Cabo Frio is characterized by warm waters that occur during fall and winter and have temperatures generally above 21 ºC and nutrient concentrations of nitrate and phosphate are below 1 and 0.4 μg-at.-, respectively.…”

Section: Methodsmentioning

confidence: 99%

Successional trajectory of the fouling community on a tropical upwelling ecosystem in southeast Rio de Janeiro, Brazil

2015

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The present study describes the successional trajectory of the fouling community in the upwelling region of Cabo Frio in southeastern Rio de Janeiro, Brazil. For 12 months, five PVC panels were sampled monthly by underwater photography to record the percent cover of fouling organisms, which allowed for the evaluation of the successional process through functional groups. The variability in the composition of the fouling community increased throughout the successional trajectory, creating a mosaic pattern. The identification of two associations after a year of observation, with one characterized by filamentous algae, Hydrozoa and Cirripedia and another mainly by articulated calcareous algae, shows that divergent trajectories can be observed even under the same environmental conditions. As an important seasonal factor of the local oceanographic characteristics, the upwelling events allowed for an environmental heterogeneity, and rejecting the classic orderly and directional succession model.

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Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf

Cited by 77 publications

References 22 publications

South Tropical Atlantic anti-phase response to Holocene Bond Events

South Tropical Atlantic anti-phase response to Holocene Bond Events

Biophysical interactions in the Cabo Frio upwelling system, southeastern Brazil

Successional trajectory of the fouling community on a tropical upwelling ecosystem in southeast Rio de Janeiro, Brazil

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