Oceanographic characteristics of an impacted coastal bay: Baía de Guanabara, Rio de Janeiro, Brazil

Kjerfve, Björn; Ribeiro, Cesar H. A.; Dias, Gilberto T. M.; Filippo, Alessandro; Quaresma, Valéria da Silva

doi:10.1016/s0278-4343(97)00028-9

Cited by 377 publications

(405 citation statements)

References 14 publications

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“…Guanabara Bay is the most anthropogenically disturbed area along the Brazilian coast (Dorneles et al, 2008b). The estuary is bordered by more than 14,000 industries and four cities (Wasserman et al, 2006) with a population of more than 10 million people (Jablonski et al, 2006;Kjerfve et al, 1997). Despite the anthropogenic pressure, the small Guiana dolphin population exhibits habitat fidelity to Guanabara Bay, since the same individuals are found year-round in this site (Azevedo et al, 2004), where feeding-related activities predominate .…”

Section: A Serious Pcb Problemmentioning

confidence: 99%

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Dorneles

Sanz

Eppe

et al. 2013

Science of The Total Environment

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• Dioxin-like PCBs accounted for over 83% of the total TEQ for all cetaceans • Negative correlations were found between length and TEQ values in franciscanas.• PCB concentrations found are among the highest ever reported for cetaceans. a b s t r a c t a r t i c l e i n f o Blubber samples from three delphinid species (false killer whale, Guiana and rough-toothed dolphin), as well as liver samples from franciscana dolphins were analyzed for dioxins and related compounds (DRCs). Samples were collected from 35 cetaceans stranded or incidentally captured in a highly industrialized and urbanized area (Southeast and Southern Brazilian regions). Dioxin-like PCBs accounted for over 83% of the total TEQ for all cetaceans. Non-ortho coplanar PCBs, for franciscanas (82%), and mono-ortho PCBs (up to 80%), for delphinids, constituted the groups of highest contribution to total TEQ. Regarding franciscana dolphins, significant negative correlations were found between total length (TL) and three variables, ΣTEQ-DRCs, ΣTEQ-PCDF and ΣTEQ non-ortho PCB. An increasing efficiency of the detoxifying activity with the growth of the animal may be a plausible explanation for these findings. This hypothesis is reinforced by the significant negative correlation found between TL and PCB126/PCB169 concentration ratio. DRC concentrations (ng/g lipids) varied from 36 to 3006, for franciscana dolphins, as well as from 356 to 30,776, for delphinids. The sum of dioxin-like and indicator PCBs varied from 34,662 to 279,407 ng/g lipids, for Guiana dolphins from Rio de Janeiro state, which are among the highest PCB concentrations ever reported for cetaceans. The high concentrations found in our study raise concern not only on the conservation of Brazilian coastal cetaceans, but also on the possibility of human health problem due to consumption of fish from Brazilian estuaries.

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Section: A Serious Pcb Problemmentioning

confidence: 99%

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Dorneles

Sanz

Eppe

et al. 2013

Science of The Total Environment

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“…For example, Baía de Guanabara, according to Kjerfve et al (1997), has a V /Q f ratio twice as small, varying from 0.12 × 10 8 s to 0.67 × 10 8 s in the dry and wet season, respectively. A V /Q f ratio of 0.12 × 10 8 s was also estimated for Baía de Paranaguá, considering a year average freshwater input of about 200 m 3 s -1 (Lessa et al, 1998;Mantovanelli et al, 2004).…”

Section: Sitementioning

confidence: 99%

“…Except for BG (Kjerfve et al, 1997), a comprehensive overview of the oceanographic characteristics of large Brazilian bays and their surrounding coastal zone is not yet found in the scientific literature. For instance, the relevant publications for BTS are restricted to studies regarding data analysis (Wolgemuth et al, 1981;Lessa et al, 2001) and modeling of water circulation (Montenegro et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Oceanographic characteristics of Baía de Todos os Santos, Brazil

Cirano¹,

Lessa²

2007

Rev. Bras. Geof.

139

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ABSTRACT. Based on a vast set of in situ data, a first comprehensive overview of the oceanographic characteristics of Baía de Todos os Santos (BTS) is provided.BTS is the second largest coastal bay in Brazil (maximum area of 1223 km 2 and average depth of 9.8 m), and is located in the northeast Brazil, in the vicinity of Salvador city. The circulation inside the bay is mostly tidally driven and does not vary significantly throughout the year. On the other hand, the wet (winter) and dry (summer) seasons does alter significantly the distribution of water properties inside the BTS. During summer, the waters inside the bay have oceanic characteristics, with Tropical Water (TW) penetrating along the whole region, except for the mouth of Rio Paraguaçu. The water temperature inside the bay is higher than in the coastal zone, and variations can be up to 3 • C, reaching a maximum of nearly 30 • C. During winter, with the increase of freshwater inflow, salinity variations of about 4 are observed between the innermost stations inside BTS and the adjacent coastal region. Salinity values inside the bay can be as low as 32.3, inhibiting the penetration of TW into the BTS, which is totally occupied by a locally formed Coastal Water (CW). An evaluation of the flushing time is also provided and shows that during summer, a 60-fold increase can be observed compared to winter (38 days). While the circulation does not vary seasonally inside the bay, the associated inner shelf is characterized by two different scenarios. During summer, the upwelling favorable easterlies drive a southwestward flow, while during winter the more frequent occurrence of cold fronts (southerly winds) tend to reverse the circulation.Keywords: Baía de Todos os Santos, circulation, tides, water masses. RESUMO.Com base em um amplo conjunto de dados in situ, este artigo apresenta uma primeira caracterização oceanográfica da Baía de Todos os Santos. A BTSé a segunda maior baía costeira do Brasil (área máxima de 1223 km 2 e profundidade média de 9,8 m), e está localizada na região nordeste do Brasil, nas proximidades da cidade de Salvador. A circulação no interior da baíaé predominantemente forçada pelas marés e não varia significantemente ao longo do ano. Por outro lado, as estações chuvosa (inverno) e seca (verão) geram uma alteração significativa nas propriedades daságuas no interior da BTS. Durante o verão, aságuas dentro da baía têm características oceânicas, com aÁgua Tropical (AT) penetrando ao longo de toda a região, com exceção da desembocadura do Rio Paraguaçu. A temperatura dá agua dentro da baíaé maior do que a da região costeira adjacente, e estas variações podem ser de até 3 • C, atingindo um máximo de 30 • C. Durante o inverno, com o aumento do aporte deágua doce, variações de salinidade de cerca de 4 podem ser observadas entre a parte mais interna da BTS e a região costeira adjacente. Valores de salinidade dentro da baía podem chegar até 32,3, inibindo a penetração da AT dentro da BTS, que fica totalmente ocupada por umaágua costeira formada local...

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“…The bay has an area of approximately 384 km 2 including its several islands and presents a coastline of 131 km long and a mean water volume of 1.87×10 9 m 3 (Amador, 1980). It measures 28 km west to east and 30 km north to south, with a narrow entrance (1.6 km wide) (Kjerfve et al, 1997). Guanabara Bay shows a complex bathymetry with a relatively flat central channel, 400 m wide, stretching from the bay's mouth to more than 5 km into the bay more or less defined by of 30 m isobath.…”

Section: Environmental Settingmentioning

confidence: 99%

Distinctive sedimentary processes in Guanabara Bay - SE/Brazil, based on the analysis of echo-character (7.0 kHz)

Catanzaro¹,

Neto²,

Guimarães³

et al. 2004

Rev. Bras. Geof.

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ABSTRACT. Guanabara Bay bottom sediments and seabed characteristics were analysed using high-resolution (7 kHz) sub-bottom profiles associated with particle size analyses of 92 bottom sediment samples. Eight types of echo-characters were identified revealing the strong relation with the particle size distribution. Sandy bottom areas presented strong echo reflections, without sub-bottom penetration (Echo types I and III), while in muddy areas sub-bottom reflections showed the acoustic basement delineating buried sugar-loaf hills and infilled-valley features (Echo type IV). The presence of shallow gas within the sediments is indicated by acoustic blanket and a series of bottom-multiple reflections (Echo types Va and Vb). Erosion by bottom currents and artificial mechanical dredging are suggested by truncations of sub-bottom reflections and a wrinkled seabed surface (Echo types VI and VII). Crystalline basement outcrops on the seabed are recognized by multiple or single hyperbolae with varying elevations above the bay bottom (Echo type II).

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Oceanographic characteristics of an impacted coastal bay: Baía de Guanabara, Rio de Janeiro, Brazil

Cited by 377 publications

References 14 publications

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Oceanographic characteristics of Baía de Todos os Santos, Brazil

Distinctive sedimentary processes in Guanabara Bay - SE/Brazil, based on the analysis of echo-character (7.0 kHz)

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