Mangrove‐Derived Organic and Inorganic Carbon Exchanges Between the Sinnamary Estuarine System (French Guiana, South America) and Atlantic Ocean

Type Article
Date 2020-08
Language English
Author(s) Ray Raghab1, Thouzeau Gerard1, Walcker Romain2, Vantrepotte Vincent3, 4, Gleixner Gerd5, Morvan Sylvain4, Devesa Jeremy1, Michaud Emma1
Affiliation(s) 1 : CNRS, Univ Brest, IRD, Ifremer, LEMAR Plouzané ,France
2 : EcoLab, Univ Toulouse, CNRS, INPT, UPS Toulouse ,France
3 : LOG, UMR 8187 CNRS, Univ Lille, ULCO, Univ du Littoral Côte d'Opale Wimereux, France
4 : LEEISA, USR 3456 CNRS, Univ Guyane, Ifremer, Centre de recherche de Montabo Guyane, Française France
5 : Department of Biogeochemical Processes Max Planck Institute for Biogeochemistry Jena, Germany
Source Journal Of Geophysical Research-biogeosciences (2169-8953) (American Geophysical Union (AGU)), 2020-08 , Vol. 125 , N. 8 , P. e2020JG005739 (24p.)
DOI 10.1029/2020JG005739
WOS© Times Cited 12
Keyword(s) organic matter, tidal cycle, carbon flux, mangroves, French Guiana

There is growing evidence that a substantial fraction of the dissolved organic and inorganic carbon (DOC and DIC) and particulate organic carbon (POC) can be exported from mangroves to the ocean. Yet our understanding of C fluxes in mangrove forests is limited to only few regional studies that exclude the world's longest sediment dispersal system connected to the Amazon River. The present study aims at (1) examining tidal fluctuations of DOC, POC, and DIC; their isotopes; and optical properties such as chromophoric dissolved organic matter (CDOM) and (2) estimating their exchange fluxes between the mangroves and adjacent coastal water in the Sinnamary estuary, French Guiana. Time series observation highlighted that physical processes coupled to tides controlled diel dynamics and sources of DOC (e.g., litter leaching and pore water seepage) and POC (microphytobenthos, sediment resuspension, and bioturbation activities). Intense benthic remineralization could account for high water column pCO2 and DIC exchange flux during the low tide. Mangrove‐derived DOC export to inner shelf (8.14 g C m−2 day−1) was exceeding import of POC and DIC from the mud bank and marine sources to the mangroves (1.35 and 0.90 g C m−2 day−1, respectively). Because of specific dynamics of the Amazon mobile muds, local geomorphology, water column stratification, and environmental forcing, Guianese mangroves cannot be seen as simple C exporters to the Atlantic waters. These first data setting on C fluxes for the region should be included along with other studies to improve global mangrove C budget estimate.

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Ray Raghab, Thouzeau Gerard, Walcker Romain, Vantrepotte Vincent, Gleixner Gerd, Morvan Sylvain, Devesa Jeremy, Michaud Emma (2020). Mangrove‐Derived Organic and Inorganic Carbon Exchanges Between the Sinnamary Estuarine System (French Guiana, South America) and Atlantic Ocean. Journal Of Geophysical Research-biogeosciences, 125(8), e2020JG005739 (24p.). Publisher's official version : , Open Access version :