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| Laruelle, Goulven G.; Marescaux, Audrey; Le Gendre, Romain; Garnier, Josette; Rabouille, Christophe; Thieu, Vincent. |
| 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... |
| Tipo: Text |
Palavras-chave: Dissolved inorganic and organic carbon; Carbon dioxide; Reactive-transport model; Seine river and estuary; Biogeochemical budget. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00493/60421/63858.pdf |
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| Desmit, Xavier; Lacroix, Geneviève; Thieu, Vincent; Menesguen, Alain; Dulière, Valerie; Campuzano, Francisco; Billen, Gilles; Neves, Ramiro; Lancelot, Christiane; Gypens, Nathalie; Dussauze, Morgan; Garnier, Josette; Silvestre, Marie; Passy, Paul; Lassaletta, Luis; Guittard, Gabriel; Théry, Sylvain; Thouvenin, Benedicte; Garcia, Carla; Pinto, Ligia; Sobrinho, Joao; Mateus, Marco; Ascione Kenov, Isabella. |
| One of the leading challenges in marine science and governance is to improve scientific guidance of management measures to mitigate eutrophication nuisances in the EU seas. Too few approaches integrate the eutrophication process in space (continuum river-ocean) and in time (past, present and future status). A strong need remains for (i) knowledge/identification of all the processes that control eutrophication and its consequences, (ii) consistent and harmonized reference levels assigned to each eutrophication-related indicator, (iii) identification of the main rivers directly or indirectly responsible for eutrophication nuisances in specific areas, (iv) an integrated transboundary approach and (v) realistic short term and long term nutrient reduction... |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00292/40301/38750.pdf |
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| Menesguen, Alain; Desmit, Xavier; Duliere, Valerie; Lacroix, Genevieve; Thouvenin, Benedicte; Thieu, Vincent; Dussauze, Morgan. |
| Since 1950, increase in nitrogen (N) and phosphorus (P) river loadings in the North-East Atlantic (NEA) continental seas has induced a deep change in the marine coastal ecosystems, leading to eutrophication symptoms in some areas. In order to recover a Good Ecological Status (GES) in the NEA, as required by European Water Framework Directive (WFD) and Marine Strategy Framework Directive (MSFD), reductions in N- and P-river loadings are necessary but they need to be minimal due to their economic impact on the farming industry. In the frame of the “EMoSEM” European project, we used two marine 3D ecological models (ECO-MARS3D, MIRO&CO) covering the Bay of Biscay, the English Channel and the southern North Sea to estimate the contributions of various... |
| Tipo: Text |
Palavras-chave: Marine eutrophication; Ecosystem modelling; Nutrient reduction scenario; Linear optimization; Good ecological status; EU policies. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00426/53774/54661.pdf |
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| Garnier, Josette; Castelle, Bruno; Labille, Jérôme; Souchu, Philippe; Thieu, Vincent; Delacourt, Christophe. |
| L’interface entre l’atmosphère et les surfaces continentales est un lieu d’échanges importants d’énergie et de matière liquide, solide ou gazeuse. Aussi, comprendre et quantifier les interactions entre surfaces et atmosphère est un enjeu de premier ordre pour essayer d’anticiper au mieux les conséquences de nouvelles et futures évolutions des surfaces continentales, que ce soit sous l’effet de l’évolution du climat ou de modifications de l’usage des sols. Des processus spécifiques se produisent à l’interface surface-atmosphère, rendant nécessaire l’étude de cette interface non comme un simple lieu de transfert, mais en tant qu’objet propre. S’attacher à identifier et quantifier les processus opérant dans le continuum sol-eau-plante-atmosphère doit... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00603/71464/69919.pdf |
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| Garnier, Josette; Riou, Philippe; Le Gendre, Romain; Ramarson, Antsiva; Billen, Gilles; Cugier, Philippe; Schapira, Mathilde; Théry, Sylvain; Thieu, Vincent; Ménesguen, Alain. |
| The continental coastal waters of the Eastern Channel, from Normandy to Hauts-de-France, are subject to the major influence of unbalanced nutrient inputs from inflowing rivers. Several episodes of harmful algal blooms (HABs) compromising fishing and shellfish farming activities have been observed at the coast. For a better understanding of how the land-to-sea aquatic continuum functions, the GRAFS-RIVERSTRAHLER river biogeochemical model was implemented to cover the watersheds of 11 rivers flowing into this area (including the Seine) and chained with the ecological marine ECO-MARS3D model, applied to the French Northern coastal zone. Human activities strongly impact on the functioning of coastal ecosystems. Specifically, for these fertile soils of Northern... |
| Tipo: Text |
Palavras-chave: Toxic microalgae; Pseudo-nitzschia spp.; River basins; Nutrient flows; Scenarios; Coastal zone ecosystem; Modelling. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00589/70076/68049.pdf |
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| Billen, Gilles; Garnier, Josette; Ramarson, Antsiva; Romero, Estela; Thieu, Vincent; Le Noe, Julia; Silvestre, Marie; Thery, Sylvain; Barles, Sabine; Bognon, Sabine; Castaings, Jerome; Legendre, Romain; Riou, Philippe; Bacq, Nicolas; Fisson, Cédric. |
| Le système agro-alimentaire du bassin de la Seine est aujourd’hui caractérisé par une extrême spécialisation en grandes cultures céréalières de sa partie centrale, l’élevage étant repoussé vers sa frange orientale où domine la polyculture-élevage, et celle occidentale dont les systèmes se rapprochent du modèle d’élevage intensif du Grand Ouest. Cette spécialisation s’inscrit dans le mouvement historique de «modernisation» de l’agriculture qui s’affirme au milieu du XXe siècle, et est accentué en ce début de XXIe siècle par les politiques publiques et privées qui visent à renforcer la concentration de population le long de l’axe Paris-Le Havre («Le Grand Paris») au détriment des zones amont du bassin, et à accroitre la place de la France comme exportatrice... |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00416/52796/53695.pdf |
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