Caracterização hidrográfica da plataforma continental do maranhão a partir de dados oceanográficos medidos, remotos e modelados

Silva, Alex Costa da; Araújo, Moacyr; Pinheiro, Lidriana de Souza

doi:10.1590/s0102-261x2007000300005

Cited by 8 publications

(8 citation statements)

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“…Johns et al (1998) (Silva et al, 2007a), mostram a predominância de ventos alísios de nordeste em maio, período este em que a Zona de Convergência Intertropical (ZCIT) se encontra mais próxima do Equador e há mudança na variação de direção dos ventos alísios de nordeste para sudeste em junho (Figura 3).…”

Section: Dinâmica Na Plataforma Continental Do Amazonas E áRea Oceâniunclassified

Observações hidrológicas e resultados de modelagem no espalhamento sazonal e espacial da pluma de água Amazônica

et al. 2009

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ResumoNeste estudo são apresentadas as análises espaciais e temporais dos dados sinóticos coletados durante quatro campanhas oceanográficas do programa "REVIZEE/SCORE-N" realizadas em março-abril de 1995, outubro-novembro de 1997, abrilmaio de 1999 e agosto-setembro de 2001. Em complemento às análises dos dados hidrológicos, foram utilizados resultados do modelo numérico CLIPPER -Experimento ATL6 (1/6 deg.). A ênfase deste artigo é avaliar o deslocamento sazonal e espacial da pluma de água Amazônica nas regiões localizadas à sudoeste, noroeste e em frente à foz do rio Amazonas. Dados hidrológicos e resultados do modelo demonstram que durante os meses de março-maio a pluma do rio Amazonas move-se para sudoeste, ao longo da costa norte brasileiro, tendendo a diminuir o deslocamento da pluma para sudoeste durante os meses de agosto-setembro. De outubro a novembro, não foi observado ou registrado o deslocamento da pluma para sudoeste. Resultados do modelo revelam anéis gerados pela retroflexão da Corrente Norte do Brasil (CNB) em torno de 7º N, e também a influência de água proveniente do rio Amazonas em volta desses anéis durante o mês de agosto.PalavRas-chave: Pluma do rio Amazonas; anéis; Corrente Norte do Brasil; modelo Atlântico; dados do REVIZEE. Hydrological observations and modeling results of the seasonal and spatial spread of the Amazonian water plume abstRactIn this study, we present surface synoptic data collected during four oceanographic cruises undertaken in March-April 1995, October-November 1997, April-May 1999 and August-September 2001 in the Brazilian Program "REVIZEE/SCORE-NO" and a combination of model results (1/6 deg.). The emphasis of this paper is to point out the monthly changes on the spreading of the Amazon plume over the external Amazon shelf area and the eastern region of the Amazon River. Hydrographic data and model results demonstrated that during March-May, the Amazon plume moved southwestward along the northern coast of Brazil, decreasing during August-September; but this was not observed during October-November. Model results revealed ring signatures shedding from the North Brazil Current (NBC). Results also showed that during August the Amazon plume encircling the NBC retroflection was around 7º N.

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Section: Dinâmica Na Plataforma Continental Do Amazonas E áRea Oceâniunclassified

Observações hidrológicas e resultados de modelagem no espalhamento sazonal e espacial da pluma de água Amazônica

et al. 2009

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“…Thus, it suggests the same spawning period for the southwestern Atlantic. Studies conducted with past oceanographic data obtained in situ and modelled from the Maranhão shelf suggest that a reduction in SST occurs and that a band of colder water appears in June in the oceanic region adjacent to the continental shelf (Silva et al ., 2007), strong wind shear occurs from January to July (Geyer et al ., 1996; Silva, 2006) and fresh water contributes hundreds of kilometres in an open sea direction (Ffield, 2007; Hellweger & Gordon, 2002).…”

Section: Discussionmentioning

confidence: 99%

Demography of the black grouper, Mycteroperca bonaci (Poey, 1860) (Teleostei: Epinephelidae) from the North Brazil Shelf

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Filho²,

Feitosa

et al. 2022

Journal of Fish Biology

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Mycteroperca bonaci (black grouper) is one of the most sought species of grouper along its entire distribution, being a prime target for demersal line fisheries because of its high commercial value. Nonetheless, because of population declines the species is considered near threatened according to the IUCN red list. The present study aimed to determine the population parameters of M. bonaci, including growth, reproduction and mortality, and thus contributes to measures towards its conservation and management in the southwestern Atlantic. The sampling area is in the North Brazil Shelf, off Maranhão State, an area of intense fisheries development and yet poorly known. The large continental shelf harbours unique coral reef formations and has been declared an ecologically or biologically significant marine area (EBSA). Sampling on landing sites was carried out monthly between May 2017 and January 2019. A total of 137 black grouper specimens were sampled from commercial landings of artisanal fisheries. The size of the specimens ranged from 44 to 157 cm, and the weight varied from 0.976 to 54 kg. The length–weight was established: log(TW) = −11.26 + 3.01log(TL). Histological analysis of the gonads confirmed only the presence of female individuals, and the occurrence of individuals in the sexual transition was not recorded. Higher GSI values and higher frequency of spawning capable staged individuals occurred during the months of June to August, indicating spawning peaks. The estimated age of sexual maturity A50 for females was 4.62 years (falsex_ 93 cm−TL). The growth parameters for the Von Bertalanffy model were TL∞ (cm): 185.5, k: 0.04, t0 (year): −4.75 (t0 not fixed) and TL∞ (cm): 141, k: 0.11 (t0 = 0 fixed). The total estimated mortality rate (Z) according to catch length presented a Z value = 0.11, and the natural mortality was M = 0.04 year−1. This is the first study on the age and growth of M. bonaci in the SWA, a region where the species is considered as endangered according to Brazil's red list regional assessment. Only females were present in the samples, results that suggest either differential capturability of sexes because of distinct patterns of behaviour or distribution or an effect of selective mortality upon larger and older individuals, as the species is described as a protogynous hermaphrodite. This indicates the need to closely manage this population to avoid collapses. Recovery plans that have been planned by the Brazilian government but not yet implemented for the species must be put into practice to avoid progressive decline as fisheries target more remote areas.

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“…Conceitua-se que as regiões equatoriais são áreas de grande importância inter-hemisféricas (SILVA, et al, 2007). Silva ( 2006) relata a quantidade de radiação solar que chega à superfície terrestre depende muito da latitude, isto é, da posição geográfica do local.…”

Section: Breves Considerações Geográficas De Iluminaçãounclassified

O Mercado Imobiliário Por Loteamentos Fechados Como Impulsor Da Dispersão Urbana Em Macapá, Amapá

Corrêa¹,

Leonelli²

2022

Encontros E Percepções Geográficas: Diálogos E Provocações

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Caracterização hidrográfica da plataforma continental do maranhão a partir de dados oceanográficos medidos, remotos e modelados

Cited by 8 publications

References 19 publications

Observações hidrológicas e resultados de modelagem no espalhamento sazonal e espacial da pluma de água Amazônica

Observações hidrológicas e resultados de modelagem no espalhamento sazonal e espacial da pluma de água Amazônica

Demography of the black grouper, Mycteroperca bonaci (Poey, 1860) (Teleostei: Epinephelidae) from the North Brazil Shelf

O Mercado Imobiliário Por Loteamentos Fechados Como Impulsor Da Dispersão Urbana Em Macapá, Amapá

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