globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-017-0405-y
Scopus记录号: 2-s2.0-85035340277
论文题名:
Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)
作者: Cotovicz L.C.; Jr.; Knoppers B.A.; Brandini N.; Poirier D.; Costa Santos S.J.; Cordeiro R.C.; Abril G.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期:2018-01-02
语种: 英语
英文关键词: Carbon dynamics ; Eutrophication ; Marine carbonate system ; Organic carbon ; Southeastern coast of Brazil
英文摘要: We 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 (pCO2), 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 pCO2 undersaturation, and DOC reached 82 mg L−1, POC 152 mg L−1, and Chl a 800 μg 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. © 2017, Springer International Publishing AG, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83200
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Departamento de Geoquímica, Universidade Federal Fluminense, Outeiro São João Batista s/n, Niterói, RJ, Brazil; Laboratoire Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), CNRS, Université de Bordeaux, Allée Geoffroy Saint-Hilaire, Pessac Cedex, France; Laboratoire d’Océanographie et du Climat: Expérimentations et Analyses Numériques (LOCEAN), Centre IRD France Nord, 32 avenue Henri Varagnat, Bondy Cedex, France

Recommended Citation:
Cotovicz L.C.,Jr.,Knoppers B.A.,et al. Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)[J]. Biogeochemistry,2018-01-01,137(2018-01-02)
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