Carbon Dynamics Along the Seine River Network: Insight From a Coupled Estuarine/River Modeling Approach

Type Article
Date 2019-04
Language English
Author(s) Laruelle Goulven G.1, 2, Marescaux Audrey1, 2, Le Gendre RomainORCID3, Garnier Josette1, 4, Rabouille Christophe5, Thieu Vincent1
Affiliation(s) 1 : UMR 7619 Metis, CNRS, EPHE, Institute Pierre Simon Laplace (IPSL), Sorbonne Université, Paris, France
2 : FR636 Institute Pierre Simon Laplace (IPSL), CNRS, Sorbonne Université, Paris, France
3 : IFREMER LEAD NC, Noumea, New Caledonia
4 : FR3020 Fédération-Ile-de-France de Recherche sur l’Environnement (FIRE), CNRS, Sorbonne Université, Paris, France
5 : Laboratoire des Sciences du Climat et de l’Environnement, UMR CEA-CNRS-UVSQ et IPSL, Gif-sur-Yvette, France
Source Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2019-04 , Vol. 6 , N. 216 , P. 16p.
DOI 10.3389/fmars.2019.00216
Keyword(s) dissolved inorganic and organic carbon, carbon dioxide, reactive-transport model, Seine river and estuary, biogeochemical budget
Abstract

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.

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Laruelle Goulven G., Marescaux Audrey, Le Gendre Romain, Garnier Josette, Rabouille Christophe, Thieu Vincent (2019). Carbon Dynamics Along the Seine River Network: Insight From a Coupled Estuarine/River Modeling Approach. Frontiers In Marine Science, 6(216), 16p. Publisher's official version : https://doi.org/10.3389/fmars.2019.00216 , Open Access version : https://archimer.ifremer.fr/doc/00493/60421/