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Cotovicz L. C., Knoppers B. A., Brandini N., Poirier D., Santos S. J. C., Cordeiro R. C., Abril Gwenaël. (2018). Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil). Biogeochemistry, 137 (1-2), 1-14. ISSN 0168-2563

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Titre
Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000423362600001
AuteursCotovicz L. C., Knoppers B. A., Brandini N., Poirier D., Santos S. J. C., Cordeiro R. C., Abril Gwenaël.
SourceBiogeochemistry, 2018, 137 (1-2), p. 1-14. ISSN 0168-2563
RésuméWe investigate the carbon dynamics in Guanabara Bay, an eutrophic tropical coastal embayment surrounded by the megacity of Rio de Janeiro (southeast coast of Brazil). Nine sampling campaigns were conducted for dissolved, particulate and total organic carbon (DOC, POC and TOC), dissolved inorganic carbon (DIC), partial pressure of CO2 (pCO(2)), chlorophyll a (Chl a), pheo-pigments and ancillary parameters. Highest DOC, POC and Chl a concentrations were found in confined-shallow regions of the bay during the summer period with strong pCO(2) undersaturation, and DOC reached 82 mg L-1, POC 152 mg L-1, and Chl a 800 mu g L-1. Spatially and temporally, POC and DOC concentrations varied positively with total pigments, and negatively with DIC. Strong linear correlations between these parameters indicate that the production of TOC translates to an equivalent uptake in DIC, with 85% of the POC and about 50% of the DOC being of phytoplanktonic origin. Despite the shallow depths of the bay, surface waters were enriched in POC and DOC relative to bottom waters in periods of high thermohaline stratification. The seasonal accumulation of phytoplankton-derived TOC in the surface waters reached about 105 g C m(-2) year(-1), representing between 8 and 40% of the net primary production. The calculated turnover time of organic carbon was 117 and 34 days during winter and summer, respectively. Our results indicate that eutrophication of coastal bays in the tropics can generate large stocks of planktonic biomass and detrital organic carbon which are permanently being produced and partially degraded and buried in sediments.
Plan de classementEcologie, systèmes aquatiques [036]
Descr. géo.BRESIL ; RIO DE JANEIRO ; GUANABARA BAIE
LocalisationFonds IRD [F B010072022]
Identifiant IRDfdi:010072022
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010072022

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