TY - JOUR T1 - Carbon Dynamics Along the Seine River Network: Insight From a Coupled Estuarine/River Modeling Approach A1 - Laruelle,Goulven G. A1 - Marescaux,Audrey A1 - Le Gendre,Romain A1 - Garnier,Josette A1 - Rabouille,Christophe A1 - Thieu,Vincent AD - UMR 7619 Metis, CNRS, EPHE, Institute Pierre Simon Laplace (IPSL), Sorbonne Université, Paris, France AD - FR636 Institute Pierre Simon Laplace (IPSL), CNRS, Sorbonne Université, Paris, France AD - IFREMER LEAD NC, Noumea, New Caledonia AD - FR3020 Fédération-Ile-de-France de Recherche sur l’Environnement (FIRE), CNRS, Sorbonne Université, Paris, France AD - Laboratoire des Sciences du Climat et de l’Environnement, UMR CEA-CNRS-UVSQ et IPSL, Gif-sur-Yvette, France UR - https://archimer.ifremer.fr/doc/00493/60421/ DO - 10.3389/fmars.2019.00216 KW - dissolved inorganic and organic carbon KW - carbon dioxide KW - reactive-transport model KW - Seine river and estuary KW - biogeochemical budget N2 - The Seine river discharges over 700 Gg of carbon (C) every year into the sea mostly under the form of dissolved inorganic carbon (DIC) and emits 445 Gg under the form of carbon dioxide (CO2) to the atmosphere over its entire river network. The watershed, which drains 76,000 km2, is heavily populated with 18 106 inhabitants and is thus submitted to large anthropic pressure. The offline coupling of two Reactive Transport Models is used to understand the complex spatial and temporal dynamics of carbon, oxygen and nutrients and quantify the CO2 exchange at the air-water interface along the main axis of the river. The estuarine section of the Seine is simulated by the generic estuarine model C-GEM (for Carbon Generic Estuarine Model), while the upstream part of the network, devoid of tidal influence is simulated by the pyNuts-Riverstrahler modeling platform which also includes an explicit representation of the drainage network ecological functioning. Our simulations provide a process-based representation of nutrients, oxygen, total organic carbon (TOC) and the carbonate system (DIC and alkalinity) over the entire year 2010. Our coupled modeling chain allows quantifying the respective contributions of the estuarine and freshwater sections of the system in the removal of carbon as well as following the fate of TOC and DIC along the river network. Our results also allow calculating an integrated carbon budget of the Seine river network for year 2010. Y1 - 2019/04 PB - Frontiers Media SA JF - Frontiers In Marine Science SN - 2296-7745 VL - 6 IS - 216 ID - 60421 ER -