Please use this identifier to cite or link to this item: https://app.uff.br/riuff/handle/1/19696
Title: COMPOSIÇÃO BIOGÊNICA E FLUXOS DO MATERIAL PARTICULADO NA PLATAFORMA CONTINENTAL DE CABO FRIO, BRASIL: EXPERIMENTOS COM ARMADILHAS DE SEDIMENTOS DURANTE FUNDEIOS DA PRIMAVERA DE 2010 E OUTONO DE 2011
Keywords: Fundeio;  Armadilhas de sedimento;  Matéria orgânica particulada;  Plataforma continental;  Cabo Frio;  Mooring line;  Sediment traps;  Particulate organic matter;  Continental shelf;  Cabo Frio
Issue Date: 27-Feb-2012
Abstract: The Cabo Frio upwelling system (SRCF) is recognized as one of the more productive area of the Eastern South American coast, although the role of the continental contribution as water fertilizer of the shelf has been neglected. This study reports two experiments of sediment traps positioned at 50 m (AS) and 100 m (AF) depth over the continental shelf of Cabo Frio (local depth 140 m, 23 ◦ 36 ' S-041 ◦ 34 ' W). The traps were scheduled to capture particulate matter during the sedimentation process in two experiments, the first in the late spring of 2010 (for a period of 45 days with 3 days of integration for each bottle) and the second in autumn of 2011 (for a period of 90 days with 7 days of integration for each bottle). This work addresses the flux and the composition of biogenic particulate matter (organic carbon, nitrogen, δ13C and δ 15N determined by EA-IRMS) with the attributes of their possible origin. The total mass flux captured by the traps varied widely (1.06-52.7 mg. m-2. day-1). The flux of particulate organic carbon showed smaller fluctuations (0.33-5, 37mgOC. m-2. day-1), where the mean flux at the bottom sediment traps was higher. The results of the correlations between isolated factors, such as temperature, divergent winds, cross-shelf and long-shelf flux, and the total mass flux were non significant, suggesting that the flux of particles could not be explained by the control of a single factor but by the interaction of events on the continental shelf. Particles with marine origin were captured during most of the time, but with the contribution of continental material especially at the bottom trap, suggesting a possible origin in the sedimentation and ressuspension processes of continental material in the shelf, probably the product of coastal degradation or river inputs.Thus, the SRCF is a highly dynamic and compartmentalized system, where the formation, transport and dispersion of particles are controlled by multiple processes where continental input play an important role.
URI: https://app.uff.br/riuff/handle/1/19696
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