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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32777313 |
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Table of Contents:
- Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf Silvia H.M. Sousa Michel M. de Mahiques Marcia C. Bícego Ilson C.A. Silveira Rafael A. Lourenço Marina M. Fukumoto Multidisciplinaria (Ciencias Naturales y Exactas) Brazil alkenones upwelling sedimentation South Atlantic The analyses of Uk37 paleotemperatures and sedimentological parameters in box cores from the Cabo Frioupwelling zone, southeastern Brazil, were used to understand the modern sedimentation as well as to evaluatethe 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 inthe last 700 years. Since the present upwelling is dependent on local and remote wind regime, a phase ofdominating NE winds favors a more effective upward transport of the cold thermocline level South AtlanticCentralWater towards the coast. The intensification in the upwelling regime for the last ca. 700 years can beassociated with the strengthening of the NE winds off the area and a possible increase of the Brazil Currentmesoscale activity.Nevertheless, the lack of significant correlation of the paleotemperatures and most of sedimentologicalparameters indicate that upwelling is not the only sedimentation mechanism in the area. Also, the comparisonof sedimentological parameters reveals that eventual temporal changes are superimposed by the geographicalvariability. Sedimentation rates vary from 0.26 mm.yr1 to 0.66 mm.yr1. 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777313 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.77