Biological and oceanographic upwelling indicators at Cabo Frio (RJ)

Moser, Gleyci Aparecida Oliveira; Gianesella, Sônia Maria Flores

doi:10.1590/s1413-77391997000100002

Cited by 15 publications

(2 citation statements)

References 6 publications

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“…Wind and wind stress curl variability are also important in the development of upwelling and downwelling cycles [Carbonel 2003;Castelão and Barth 2006]. Though upwelling around CF has been reported in winter [Moser and Gianesella-Galvão, 1997], the more frequent and intense events are observed in summer and spring. The later events can influence the position of the Brazilian sardine spawning areas [Matsuura, 1998] and the algal distribution [Guimaraens and Coutinho, 2000].…”

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confidence: 99%

Seasonal variability and coastal upwelling near Cape Santa Marta (Brazil)

et al. 2013

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[1] The Santa Marta Grande Cape (CSM) area, a relatively steep and narrow continental shelf off southeast Brazil, is under the influence of the Brazil Current and intense seasonal variations of the wind field that affect the composition of water masses and their circulation. Hydrographic data, satellite-derived wind stress, and numerical simulations are used to characterize the seasonal and shorter period variability of the oceanographic conditions off CSM, in the area between 27 S and 30 S. The study is focused on the upwelling episodes and the dynamical mechanisms associated with these events. Field data and numerical results indicate significant seasonal changes in the oceanographic structure, the water mass composition, and the dynamical balance. During fall and winter, when southwesterly winds prevail and the frequency of meteorological frontal systems increases, the region is characterized by waters of continental origin, the Plata Plume Water (PPW). During spring and summer, deeper waters reach the surface layer due to the action of northeasterly winds. Coastal upwelling events are revealed by surface temperature minima observed south of CSM. Synoptic data show that these events occur in pulses associated with changes in the wind direction. Analysis of the numerical results shows that this particular location of the upwelling band results from the synergy between shelf-break upwelling and the regional shelf circulation induced by the northeasterly winds, both of which are modulated by changes in the coastline orientation and shelf width.

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confidence: 99%

Seasonal variability and coastal upwelling near Cape Santa Marta (Brazil)

et al. 2013

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“…25 Coastal upwelling is an important process because it brings nutrient-rich water to the surface, thereby allowing the development of phytoplankton blooms. 23,26 Acoording to Carbonel and Valentin, 27 the sea surface temperature that normally ranges from 20 to 22 ºC may decrease to 15 °C, triggering an enrichment in nutrient concentration of up to 10-12 µmol L -1 NO 3 -N and a phytoplankton production (in chlorophyll a) of up to 6 mg L -1 .…”

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Bioaccumulation of mercury and selenium in Trichiurus lepturus

Seixas¹,

Moreira²,

Malm³

et al. 2012

J. Braz. Chem. Soc.

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Mercúrio e selênio foram determinados no tecido muscular do peixe espada (Trichiurus lepturus) de três áreas costeiras (Baía da Ilha Grande, Baía de Guanabara and Búzios, Estado do Rio de Janeiro) que apresentam diferentes condições ambientais, localizadas no sudeste brasileiro. Hg foi determinado por espectrometria de absorção atômica em vapor frio (CV-AAS) e Se por espectrometria de absorção atômica com forno de grafite (GF-AAS). As concentrações variaram de 0,44 a 0,87 µg Hg g -1 e de 0,0050 a 3,12 µg Se g -1 , em peso seco. Foram observadas diferenças significativas na concentração de mercúrio e na razão molar selênio:mercúrio entre as áreas. O comprimento total e os intervalos de tamanho influenciaram na acumulação de mercúrio, entretanto estes parâmetros biológicos não influenciaram na acumulação de selênio. Foi observado um excesso de selênio em relação ao mercúrio. Provavelmente, as diferenças regionais podem ser em parte atribuídas às diferenças nas condições ambientais (temperatura da água e produção primária), e também a outros fatores, tais como a escolha das presas e a disponibilidade destes elementos nos ambientes.Mercury and selenium were assessed in the muscle tissue of cutlassfish (Trichiurus lepturus) from three coastal areas (Ilha Grande Bay, Guanabara Bay and Búzios coast, Rio de Janeiro State, Brazil) that present different environmental conditions, localized in Southeastern Brazil. Hg was determined by cold vapor atomic absorption spectrometry (CV-AAS) and Se was determined by graphite furnace atomic absorption spectrometry (GF-AAS). Across sites, mercury and selenium in this fish ranged from 0.44 to 0.87 µg Hg g -1 and 0.0050 to 3.12 µg Se g -1 dry wt. Significant differences were observed in mercury concentrations and Se:Hg molar ratios among the areas. The total length and size intervals presented a significant influence on the accumulation of mercury, whereas this pattern was not observed for selenium. A large excess of selenium in relation to mercury was observed. Probably, the regional differences can be partly attributed to differences in the prevalent environmental conditions (water temperature and primary production), and also to other factors, such as prey choices and availability across locations.

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