Physical and chemical aspects of transient stages of the upwelling at southwest of Cabo Frio (Lat. 23ºS - Long. 42ºW)

Magliocca, A.; Miranda, Luíz Bruner de; Signorini, Sérgio R.

doi:10.1590/s0373-55241979000200005

Cited by 16 publications

(9 citation statements)

References 7 publications

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“…Cross‐shelf sea surface temperature (SST) gradients are coherent with the wind stress directions according to “coastal upwelling” theory for those regions (Figure ), with the exception of Fall and Winter south of Cabo de Santa Marta (CSM), when the cold waters along the southern coast are not driven by upwelling, but instead are advected from the Argentinian and Uruguayan shelves by the northward currents often occurring during these seasons [ Pereira , ; Campos et al ., ; Lima et al ., ; Campos et al ., ; Piola et al ., ; Lentini et al ., ; Soares and Möller , ; Zavialov et al ., ; Souza and Robinson , ; Piola et al ., ; Campos et al ., ]. Several studies presented observational evidence of the coastal upwelling phenomenon occurring at Cabo Frio (CF) [ Allard , ; Emílsson , ; Ikeda et al ., ; Magliocca et al ., ; Castro and Miranda , ; Rodrigues and Lorenzzetti , ] and south of Cabo de Santa Marta [ Lima et al ., ; Möller et al ., ; Campos et al ., ].…”

Section: Introductionmentioning

confidence: 99%

A comparison of mechanisms generating vertical transport in the Brazilian coastal upwelling regions

Mazzini

Barth

2013

J. Geophys. Res. Oceans

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[1] Several mechanisms can drive vertical velocities in the coastal ocean, including windforcing and through gradients in the vorticity field generated by flow-topography interactions. A two-layer, steady, wind-driven, analytical model is applied to the major upwelling systems of Brazil: Cabo Frio (CF) and Cabo de Santa Marta (CSM) regions. Comparisons are made between the relative roles of wind and flow-topography interaction in inducing upwelling over these regions. Ekman pumping is the weakest mechanism over the shelf, but does influence the along-shelf temperature in the CF area. Away from coastline irregularities, wind-driven upwelling (Ekman transport) dominates over all mechanisms. However, in the vicinity of capes and coastal features, topographically driven upwelling plays a significant role, and its transports may vary from 43% to 94% of winddriven upwelling. Upstream of capes, topographically driven vertical motions are downwelling favorable and act against the wind-driven coastal upwelling, while downstream of capes, they are upwelling favorable, where all mechanisms add up to create strong upwelling. Peaks in total upwelling in the CF region are about twice as large as those in the CSM area because the CF region has stronger winds and larger coastline perturbations than in the CSM region. Observed sea surface temperatures (SST) agree well with variability in the vertical transports where upwelling peaks are in phase with low temperature peaks along the coast. Results suggest that on larger scales, the SST variability along the coast is mainly controlled by wind-driven upwelling, while upwelling due to flowtopography interaction is responsible for the smaller scale SST variability.

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Section: Introductionmentioning

confidence: 99%

A comparison of mechanisms generating vertical transport in the Brazilian coastal upwelling regions

Mazzini

Barth

2013

J. Geophys. Res. Oceans

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“…de interação ar-mar, à circulaç~o e às características geomorfológicas da linha da costa e do fundo submarino. Esse fenômeno, ao ocasionar uma ripida renova-ç~o das iguas costeiras (Silva & Rodrigues, 1966;Almeida & Azevedo, 1970;Ikeda et al, 1974;Tanaka, 1977;Rodrigues, 1977;Magliocca et al, 1979;Mesquita et al, 1979), por água de origem oceânica de camadas mais profundas, faz com que a correlação T-S das iguas da plataforma continental seja muito semelhante aquela obtida para a região oceânica adjacente.…”

Section: Introductionunclassified

Forma da correlação T-S de massas de água das regiões costeira e oceânica entre o Cabo de São Tomé (RJ) e a Ilha de São Sebastião (SP), Brasil

Miranda

1985

Bol. Inst. Oceanogr.

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As variações na estrutura e em propriedades de massas de água da plataforma continental e das de água oceânica adjacente são estudadas com base em expressões analíticas das curvas T-S, As medições das variáveis oceanográficas foram feitas por métodos clássicos numa rede de estações hidrografiacas, as quais foram amostradas em cinco intervalos de tempo (5-10 dias) cada um, entre os meses de janeiro de 1970 e fevereiro de 1971. A revisão da classificação das massas de água usada sob condições regionais confirma que as Massas de Água Subtropical Profunda (ASTP), Subtropical (AST) e Centrando Atlântico Sul (ACAS), são designações diferentes de uma mesma massa de água. A ultima nomenclatura, Água Central do Atlântico Sul (ACAS), é sugerida para indicar a massa de água com índice termohalino (20,0ºC; 36,36 ‰) , a qual e observada sob a Massa de Água Tropical. Esse valor de salinidade e um pouco maior do que o índice termohalino modificado da ACAS (36,20 ‰) e pode ser usado com vantagem nos cálculos volumétricos na área. As expressões polinomiais da curva T-S, cujos coeficientes foram determinados pelo método dos mínimos quadrados, foram usadas em aplicações práticas. Nessas aplicações, foram desenvolvidos métodos alternativos para a determinação da derivada termohalina e da razao de densidade constante (Rρ = αdT/βdS).

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“…Upwelling involves the ascent of cold, nutrient-rich water from subsurface layers to the surface, favoring primary production in the euphotic zone, where mass and energy are transferred through food webs; these physical processes highly impact marine life where they occur (Magliocca et al, 1979;Lehmann & Myrberg, 2008;Merino & MonrealGómez, 2009). As a result, upwelling regions are the most productive areas of the ocean (Coelho et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon, when combined with the intrusion of South Atlantic Central Water (SACW) with temperatures below 20°C and salinities between 34.6 and 36.0 (Miranda, 1985), makes the Cabo Frio region and adjacent areas highly productive and important for the distribution and abundance of benthic communities (De Léo & Pires-Vanin, 2006). Studies of Magliocca et al (1979) and Paviglione & Miranda (1985) indicated the occurrence of periodic events of the coastal upwelling off Cabo Frio, with its influence extending up to the proximity of the Cabo de São Tome (22ºS).…”

Section: Introductionmentioning

confidence: 99%

Ecological distribution of Nematopalaemon schmitti and Exhippolysmata oplophoroides (Crustacea: Caridea) near an upwelling area off southeastern Brazil

Herrera

Pescinelli

Costa

2017

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ABSTRACT.Regions affected by upwelling show environmental characteristics that may change the distribution of the species. This study evaluated the influence of environmental factors on the spatiotemporal distribution of two caridean shrimps, Nematopalaemon schmitti and Exhippolysmata oplophoroides, in a region of the Brazilian coast affected by Cabo Frio upwelling. Shrimps were collected monthly from July 2010 through June 2011 off Macaé off the northern coast of Rio de Janeiro State, at six locations: three at 5 m, and the other three at 15 m depth. Shrimp abundance was compared among seasons and sampling sites. Nematopalaemon schmitti (n = 1200) was more abundant at 5 m depth while E. oplophoroides (n = 2176) occurred predominately at 15 m. There were significant seasonal fluctuations in the distribution of the species in the region, resulting from variation in bottom temperature. The presence of the South Atlantic Central Water (SACW) favors the decrease in the abundance of N. schmitti and highest abundance of E. oplophoroides. The abundance of E. oplophoroides and the percentage of organic matter were significantly and positively correlated. The organic matter content in the sediment and water temperature was among the most important variables affecting seasonal distribution of the species. The distinct environmental characteristic between the bathymetric regions were a determinant factor in their spatial distribution.

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Physical and chemical aspects of transient stages of the upwelling at southwest of Cabo Frio (Lat. 23ºS - Long. 42ºW)

Abstract: Synopsis An upweUing event was observed during February

Cited by 16 publications

References 7 publications

A comparison of mechanisms generating vertical transport in the Brazilian coastal upwelling regions

A comparison of mechanisms generating vertical transport in the Brazilian coastal upwelling regions

Forma da correlação T-S de massas de água das regiões costeira e oceânica entre o Cabo de São Tomé (RJ) e a Ilha de São Sebastião (SP), Brasil

Ecological distribution of Nematopalaemon schmitti and Exhippolysmata oplophoroides (Crustacea: Caridea) near an upwelling area off southeastern Brazil

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