Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 5
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Black Sea vertical circulation and extremes of the hydrochemical and hydrooptical parameters ArchiMer
Bulgakov, Sn; Kushnir, Vm; Martinez, A.
A statistical evaluation of vertical current velocity profiles w(z) has been undertaken using data provided by current meter profilers. The calculation of profiles w(z) involves the estimation of the standard deviation of vertical current at each depth level, and the standard deviation of the statistical variability of that estimate. Profiles w(z) have been computed for the northwestern Black Sea, using current meter and CTD data from three surveys carried out during 1992-1994. The calculations show w(z) to have a two-layered structure, with zero values occurring in the main pycnocline. Such vertical current structures are consistent with a hydrodynamic model, whereby the current field is induced by buoyancy fluxes through the lateral basin boundaries....
Tipo: Text Palavras-chave: Mer Noire; Circulation verticale; Chimie marine; Optique marine; Black Sea; Vertical circulation; Hydrochemistry; Hydrooptics.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43602/43921.pdf
Imagem não selecionada

Imprime registro no formato completo
Influence of land use changes on water chemistry in streams in the State of São Paulo, southeast Brazil Anais da ABC (AABC)
Silva,Daniela M.L.; Camargo,Plínio B.; Mcdowell,William H.; Vieira,Ivan; Salomão,Marcos S.M.B.; Martinelli,Luiz A..
Streamwater is affected by several processes in the watershed including anthropogenic activities that result in changes in water quality as well as in the functioning of these stream ecosystems. Therefore, this work aims to evaluate the concentration of major ions (Ca2+, Mg2+, Na+, K+, NH4+, NO3-, NO2-, Cl-, SO4(2-), PO4(3-), HCO3-) in streams in the state of São Paulo (southeast Brazil). The sampling sites are located at undisturbed (ombrophilus dense forest, semideciduous forest and savanna - cerrado) and disturbed areas (pasture, urbanization and sugar cane crops). Streamwater chemistry varied according to land use change and, in general, was higher in disturbed sites. Streams located in undisturbed sites at Ribeira de Iguape/Alto Paranapanema watershed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrochemistry; Land use; Streams; Watersheds.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400007
Imagem não selecionada

Imprime registro no formato completo
Limnology of the largest multi-use artificial reservoir in NE Brazil: The Castanhão Reservoir, Ceará State Anais da ABC (AABC)
LACERDA,LUIZ D.; SANTOS,JANAÍNA A.; MARINS,ROZANE V.; SILVA,FRANCISCO A.T.F. DA.
Abstract This work reviews the limnology of the largest multi-use reservoir in NE Brazil, the Castanhão Reservoir in Ceará State, during 5 years of an extended drought when the reservoir’s volume decreased from 88% to about 30%. Major physical and chemical parameters of the water column, phytoplankton community, trophic state and sediment geochemistry were monitored, as well as the impact from extensive aquaculture. Water quality of the full reservoir was maintained due to hydrodynamics, which transport nutrients to the hypolimnion of a stratified water column, rendering an oligotrophic state to the reservoir, notwithstanding the large nutrient inputs from aquaculture and irrigated agriculture. However, with the extension of the drought period, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrochemistry; Hydrodynamics; Nutrients; Water quality; Sediments; Aquaculture.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502073
Imagem não selecionada

Imprime registro no formato completo
O rio Arapiuns: estudo limnológico de um corpo d'agua da região do terciário, plioceno, série das barreiras, do Baixo Amazonas. Repositório Alice
SIOLI, H..
bitstream/item/210338/1/O-Rio-Arapiuns.pdf
Tipo: Outras publicações científicas (ALICE) Palavras-chave: Hidrofísica; Hidroquímica; Rio Arapiuns; Pará; Brasil; Analysis; Hydrophysic; Água; Análise; Geografia; Geologia; Historia; Limnologia; Amazonia; Geography; Geology; History; Hydrochemistry; Limnology; Water.
Ano: 1956 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/376370
Imagem não selecionada

Imprime registro no formato completo
The impacts of land use changes in the mercury flux in the Madeira River, Western Amazon Anais da ABC (AABC)
Lacerda,Luiz D.; Bastos,Wanderley R.; Almeida,Marcelo D..
Changes in hydrochemistry and Hg distribution in the Madeira River from Porto Velho to the confluence with the Amazon River were studied in two cruises in 1997 and 2002. Water conductivity was similar in both periods, but the pH was significantly higher in 2002, in particular along the middle reaches of the river. Total suspended matter concentrations also increased from 1997 to 2002 along the same river portion, which is a result of forest conversion to other land uses, in particular pastures and agriculture accelerated during the interval between the cruises. Dissolved Hg concentrations were similar along the river in both cruises, but particulate Hg concentrations increased significantly along the middle portion of the river, although the suspended...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Deforestation; Mercury; Hydrochemistry; Contamination; Amazon.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100007
Registros recuperados: 5
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional