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Provedor de dados:  Anais da ABC (AABC)
País:  Brazil
Título:  Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf
Autores:  Mahiques,Michel M. de
Bícego,Marcia C.
Silveira,Ilson C.A.
Sousa,Silvia H.M.
Lourenço,Rafael A.
Fukumoto,Marina M.
Data:  2005-09-01
Ano:  2005
Palavras-chave:  Sedimentation
Alkenones
Bulk organic matter
Upwelling
Brazil
South Atlantic
Resumo:  The analyses of Uk'37 paleotemperatures and sedimentological parameters in box cores from the Cabo Frio upwelling zone, southeastern Brazil, were used to understand the modern sedimentation as well as to evaluate the role played by the upwelling process in the sedimentary patterns. Three box-cores located closer to the upwelling area show a general trend of cooling waters taking place in the last 700 years. Since the present upwelling is dependent on local and remote wind regime, a phase of dominating NE winds favors a more effective upward transport of the cold thermocline level South Atlantic CentralWater towards the coast. The intensification in the upwelling regime for the last ca. 700 years can be associated with the strengthening of the NE winds off the area and a possible increase of the Brazil Current mesoscale activity. Nevertheless, the lack of significant correlation of the paleotemperatures and most of sedimentological parameters indicate that upwelling is not the only sedimentation mechanism in the area. Also, the comparison of sedimentological parameters reveals that eventual temporal changes are superimposed by the geographical variability. Sedimentation rates vary from 0.26 mm.yr-1 to 0.66 mm.yr-1.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300013
Editor:  Academia Brasileira de Ciências
Relação:  10.1590/S0001-37652005000300013
Formato:  text/html
Fonte:  Anais da Academia Brasileira de Ciências v.77 n.3 2005
Direitos:  info:eu-repo/semantics/openAccess
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