TY - JOUR T1 - Mangrove‐Derived Organic and Inorganic Carbon Exchanges Between the Sinnamary Estuarine System (French Guiana, South America) and Atlantic Ocean A1 - Ray,Raghab A1 - Thouzeau,Gerard A1 - Walcker,Romain A1 - Vantrepotte,Vincent A1 - Gleixner,Gerd A1 - Morvan,Sylvain A1 - Devesa,Jeremy A1 - Michaud,Emma AD - CNRS, Univ Brest, IRD, Ifremer, LEMAR Plouzané ,France AD - EcoLab, Univ Toulouse, CNRS, INPT, UPS Toulouse ,France AD - LOG, UMR 8187 CNRS, Univ Lille, ULCO, Univ du Littoral Côte d'Opale Wimereux, France AD - LEEISA, USR 3456 CNRS, Univ Guyane, Ifremer, Centre de recherche de Montabo Guyane, Française France AD - Department of Biogeochemical Processes Max Planck Institute for Biogeochemistry Jena, Germany UR - https://archimer.ifremer.fr/doc/00643/75488/ DO - 10.1029/2020JG005739 KW - organic matter KW - tidal cycle KW - carbon flux KW - mangroves KW - French Guiana N2 - 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. Y1 - 2020/08 PB - American Geophysical Union (AGU) JF - Journal Of Geophysical Research-biogeosciences SN - 2169-8953 VL - 125 IS - 8 ID - 75488 ER -