Paleoproductivity changes during the Holocene in the inner shelf of Cabo Frio, southeastern Brazilian continental margin: Benthic foraminifera and sedimentological proxies


Autoria(s): NAGAI, R. H.; SOUSA, S. H. M.; BURONE, L.; MAHIQUES, M. M.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2009

Resumo

Sedimentological and benthic foraminifera analyses carried out on a core (length 4.15 in, collected at 22 degrees 56`31 `` S and 41 degrees 58`48 `` W, at a water depth of 43 in) sampled from the inner shelf of Cabo Frio, southeastern Brazilian continental margin, allowed identification of different hydrodynamic and productivity regimes related to sea-level fluctuations and/or climatic changes, during the last 9.4 ka cal BP. Prior to 7.0 ka cal BP, a less intense hydrodynamic and lower productivity regime occurred at lower sea levels and under drier climatic conditions. Between 7.0 and 5.0 ka cal BP, relatively stronger local oceanic circulation and relatively high productivity were observed, in a scenario of rising sea levels and more humid conditions. From 5.0 to 3.0 ka cal BP, bottom currents weakened and input of nutrients increased, with productivity levels similar to the previous phase at lower sea level and in a drier climate. From 3.0 ka cal BP up to the present, stronger hydrodynamic conditions and a higher productivity regime are linked to the establishment of the upwelling process in Cabo Frio. From 2.5 ka cal BP to the present, upwelling enhancement has been recognized, resulting from the combined action of NE winds and the intensification of the meandering pattern of the Brazil Current (BC). (C) 2008 Elsevier Ltd and INQUA. All rights reserved.

Identificador

QUATERNARY INTERNATIONAL, v.206, p.62-71, 2009

1040-6182

http://producao.usp.br/handle/BDPI/32022

10.1016/j.quaint.2008.10.014

http://dx.doi.org/10.1016/j.quaint.2008.10.014

Idioma(s)

eng

Publicador

PERGAMON-ELSEVIER SCIENCE LTD

Relação

Quaternary International

Direitos

restrictedAccess

Copyright PERGAMON-ELSEVIER SCIENCE LTD

Palavras-Chave #DEEP-SEA FORAMINIFERA #SEASONAL STRATIFICATION #UPWELLING ECOSYSTEM #EQUATORIAL PACIFIC #LEVEL VARIATIONS #WATER MASSES #CELTIC SEA #SAO-PAULO #YR BP #EASTERN #Geography, Physical #Geosciences, Multidisciplinary
Tipo

article

proceedings paper

publishedVersion