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Mangrove‐Derived Organic and Inorganic Carbon Exchanges Between the Sinnamary Estuarine System (French Guiana, South America) and Atlantic Ocean
Author(s) -
Ray Raghab,
Thouzeau Gérard,
Walcker Romain,
Vantrepotte Vincent,
Gleixner Gerd,
Morvan Sylvain,
Devesa Jeremy,
Michaud Emma
Publication year - 2020
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1029/2020jg005739
Subject(s) - mangrove , dissolved organic carbon , oceanography , estuary , water column , environmental science , total organic carbon , benthic zone , organic matter , sediment , submarine groundwater discharge , hydrology (agriculture) , geology , environmental chemistry , ecology , groundwater , chemistry , paleontology , geotechnical engineering , aquifer , biology
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 p CO 2 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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