Articles | Volume 19, issue 3
https://doi.org/10.5194/bg-19-931-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-931-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Feb 2022
Research article |
| 15 Feb 2022
| 15 Feb 2022
Nutrient transport and transformation in macrotidal estuaries of the French Atlantic coast: a modeling approach using the Carbon-Generic Estuarine Model
Xi Wei
CORRESPONDING AUTHOR
UMR Metis 7619, Sorbonne Université, CNRS EPHE, 4 Place Jussieu, Paris 75005, France
Josette Garnier
CORRESPONDING AUTHOR
UMR Metis 7619, Sorbonne Université, CNRS EPHE, 4 Place Jussieu, Paris 75005, France
Vincent Thieu
UMR Metis 7619, Sorbonne Université, CNRS EPHE, 4 Place Jussieu, Paris 75005, France
Paul Passy
UMR 8586 PRODIG, Université de Paris, 8 rue Albert Einstein, 75013 Paris, France
Romain Le Gendre
Ecosystèmes et Aquaculture Durable, Unité de Recherche Lagons, IFREMER, Nouméa 98897, New Caledonia
Gilles Billen
UMR Metis 7619, Sorbonne Université, CNRS EPHE, 4 Place Jussieu, Paris 75005, France
Maia Akopian
Department of Research and Scientific Support, French Biodiversity Agency (OFB), 5 Square Félix Nadar, 94300 Vincennes, France
Goulven Gildas Laruelle
Department of Geosciences, Environment and Society, Université Libre de Bruxelles, Brussels 1050, Belgium
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Cited articles
Arndt, S., Regnier, P., and Vanderborght, J. P.: Seasonally-resolved nutrient
export fluxes and filtering capacities in a macrotidal estuary, J. Marine
Syst., 78, 42–58, https://doi.org/10.1016/j.jmarsys.2009.02.008, 2009.
Arndt, S., Lacroix, G., Gypens, N., Regnier, P., and Lancelot, C.: Nutrient
dynamics and phytoplankton development along an estuary–coastal zone
continuum: A model study, J. Marine Syst., 84, 49–66,
https://doi.org/10.1016/j.jmarsys.2010.08.005, 2011.
Baker, A.: Land Use and Water Quality, in: Encyclopedia of Hydrological Sciences, edited by: Anderson, M. G. and McDonnell, J. J., https://doi.org/10.1002/0470848944.hsa195, 2006.
Barbier, E. B., Hacker, S. D., Kennedy, C., Koch, E. W., Stier, A. C., and
Silliman, B. R.: The value of estuarine and coastal ecosystem services,
Ecol. Monogr., 81, 169–193, https://doi.org/10.1890/10-1510.1, 2011.
Bauer, J. E., Cai, W. J., Raymond, P. A., Bianchi, T. S., Hopkinson, C. S., and Regnier, P. A.: The
changing carbon cycle of the coastal ocean, Nature,
504, 61–70, https://doi.org/10.1038/nature12857, 2013.
Bernot, M. J. and Dodds, W. K.: Nitrogen Retention, Removal, and Saturation
in Lotic Ecosystems, Ecosystems, 8, 442–453,
https://doi.org/10.1007/s10021-003-0143-y, 2005.
Billen, G. and Garnier, J.: The Phison River plume: Coastal eutrophication
in response to changes in land use and water management in the watershed,
Aquat. Microb. Ecol., 13, 3–17, https://doi.org/10.3354/ame013003, 1997.
Billen, G. and Garnier, J.: River basin nutrient delivery to the coastal
sea: Assessing its potential to sustain new production of non-siliceous
algae, Mar. Chem., 106, 148–160,
https://doi.org/10.1016/j.marchem.2006.12.017, 2007.
Billen, G., Garnier, J., and Silvestre, M.: A simplified algorithm for
calculating benthic nutrient fluxes in river systems, Ann. Limnol., 51,
37–47, https://doi.org/10.1051/limn/2014030, 2015.
Billy, C., Birgand, F., Ansart, P., Peschard, J., Sebilo, M., and Tournebize,
J.: Factors controlling nitrate concentrations in surface waters of an
artificially drained agricultural watershed, Landscape Ecol., 28, 665–684,
https://doi.org/10.1007/s10980-013-9872-2, 2013.
Brion, N., Billen, G., Guezennec, L., and Ficht, A.: Distribution of
nitrifying activity in the Seine River “France” from Paris to the estuary,
Estuaries, 23, 669–682, https://doi.org/10.2307/1352893, 2000.
Brzezinski, M. A.: THE Si : C : N RATIO OF MARINE DIATOMS: INTERSPECIFIC
VARIABILITY AND THE EFFECT OF SOME ENVIRONMENTAL VARIABLES, J. Phycol.,
21, 347–357, https://doi.org/10.1111/j.0022-3646.1985.00347.x, 1985.
Burchard, H., Schuttelaars, H. M., and Ralston, D. K.: Sediment trapping in estuaries, Annu. Rev. Mar. Sci., 10, 371–395, https://doi.org/10.1146/annurev-marine-010816-060535, 2018.
CORINE Land Cover: L'occupation des sols en 2018, available at:
https://land.copernicus.eu/pan-european/corine-land-cover/clc2018 (last access: 7 February 2022),
2018.
Coynel, A., Seyler, P., Etcheber, H., and Meybeck, M.: Spatial and seasonal
dynamics of total suspended sediment and organic carbon species in the Congo
River, Global Biogeochem. Cy., 19, 1–17, https://doi.org/10.1029/2004GB002335, 2005.
Coynel, A., Gorse, L., Curti, C., Schafer, J., Grosbois, C., Morelli, G.,
Ducassou, E., Blanc, G., Maillet, G. M., and Mojtahid, M.: Spatial
distribution of trace elements in the surface sediments of a major European
estuary (Loire Estuary, France): Source identification and evaluation of
anthropogenic contribution, J. Sea Res., 118, 77–91,
https://doi.org/10.1016/j.seares.2016.08.005, 2016.
Crossland, C. J., Kremer, H. H., Lindeboom, H. J., Marshal Crosslandl, J. I.,
and Le Tissier, M. D. A. (Eds.): Coastal Fluxes in the Anthropocene, Springer Berlin Heidelberg, Berlin, Heidelberg, https://doi.org/10.1007/3-540-27851-6, 2005.
Cugier, P., Billen, G., Guillaud, J. F., Garnier, J., and Ménesguen, A.:
Modelling the eutrophication of the Seine Bight (France) under historical,
present and future riverine nutrient loading, J. Hydrol., 304,
381–396, https://doi.org/10.1016/j.jhydrol.2004.07.049, 2005a.
Cugier, P., Ménesguen, A., and Guillaud, J. F.: Three-dimensional (3D)
ecological modelling of the Bay of Seine (English Channel, France), J. Sea
Res., 54, 104–124, https://doi.org/10.1016/j.seares.2005.02.009, 2005b.
Defontaine, S., Sous, D., Morichon, D., Verney, R., and Monperrus, M.:
Hydrodynamics and SPM transport in an engineered tidal estuary: The Adour
river (France), Estuar. Coast. Shelf S., 231, 106445,
https://doi.org/10.1016/j.ecss.2019.106445, 2019.
Dürr, H. H., Laruelle, G. G., van Kempen, C. M., Slomp, C. P., Meybeck,
M., and Middelkoop, H.: Worldwide Typology of Nearshore Coastal Systems:
Defining the Estuarine Filter of River Inputs to the Oceans, Estuar.
Coast., 34, 441–458, https://doi.org/10.1007/s12237-011-9381-y, 2011.
Edmondson, W. T.: VOLLENWEIDER, R. A. 1968. Water management research. Scientific fundamentals of the eutrophication of lakes and flowing waters with particular reference to nitrogen and phosphorus as factors in eutrophication. Organization for Economic Co-operation and Development. Directorate for Scientific Affairs. Paris. Mimeographed. 159 p. + 34 Figs. + 2 separately paged annexes: Bibliography, 61 p; Current status of research on eutrophication in Europe, the United States and Canada, 20 p. (French and German versions available.), Limnol. Oceanogr., 15, 169–170, https://doi.org/10.4319/lo.1970.15.1.0169, 1970.
Escolano, J. J., Pedreño, J. N., Lucas, I. G., Almendro Candel, M. B.,
and Zorpas, A. A.: Decreased Organic Carbon Associated With Land Management
in Mediterranean Environments, Report From the Commission to the European
Parliament, the Council, Elsevier Inc., 2018.
Etcheber, H., Taillez, A., Abril, G., Garnier, J., Servais, P., Moatar, F.,
and Commarieu, M. V.: Particulate organic carbon in the estuarine turbidity
maxima of the Gironde, Loire and Seine estuaries: Origin and lability,
Hydrobiologia, 588, 245–259, https://doi.org/10.1007/s10750-007-0667-9, 2007.
EU Water Framework Directive (WFD): DIRECTIVE 2000/60/EC OF THE EUROPEAN
PARLIAMENT AND OF THE COUNCIL, available at:
https://ec.europa.eu/environment/water/water-framework/index_en.html (last access: 7 February 2022), 2000.
Garnier, J., Billen, G., and Cébron, A.: Modelling nitrogen
transformations in the lower Seine river and estuary (France): impact of
wastewater release on oxygenation and N2O emission, Hydrobiologia, 588,
291–302, https://doi.org/10.1007/s10750-007-0670-1, 2007.
Garnier, J., Billen, G., Even, S., Etcheber, H., and Servais, P.: Organic
matter dynamics and budgets in the turbidity maximum zone of the Seine
Estuary (France), Estuar. Coast. Shelf S., 77, 150–162,
https://doi.org/10.1016/j.ecss.2007.09.019, 2008.
Garnier, J., Beusen, A., Thieu, V., Billen, G., and Bouwman, L.: N : P : Si
nutrient export ratios and ecological consequences in coastal seas evaluated
by the ICEP approach, Global Biogeochem. Cy., 24, GB0A05,
https://doi.org/10.1029/2009GB003583, 2010a.
Garnier, J., Billen, G., Némery, J., and Sebilo, M.: Transformations of
nutrients (N, P, Si) in the turbidity maximum zone of the Seine estuary and
export to the sea, Estuar. Coast. Shelf S., 90, 129–141,
https://doi.org/10.1016/j.ecss.2010.07.012, 2010b.
Garnier, J., Riou, P., Le Gendre, R., Ramarson, A., Billen, G., Cugier, P.,
Schapira, M., Théry, S., Thieu, V., and Ménesguen, A.: Managing the
Agri-Food System of Watersheds to Combat Coastal Eutrophication: A
Land-to-Sea Modelling Approach to the French Coastal English Channel,
Geosciences, 9, 441, https://doi.org/10.3390/geosciences9100441, 2019.
Garnier, J., Billen, G., Lassaletta, L., Vigiak, O., Nikolaidis, N. P., and
Grizzetti, B.: Hydromorphology of coastal zone and structure of watershed
agro-food system are main determinants of coastal eutrophication, Environ.
Res. Lett., 16, 023005, https://doi.org/10.1088/1748-9326/abc777, 2021.
Glibert, P. M.: Harmful algae at the complex nexus of eutrophication and
climate change, Harmful Algae, 91, 101583,
https://doi.org/10.1016/j.hal.2019.03.001, 2020.
Gohin, F., Van der Zande, D., Tilstone, G., Eleveld, M. A., Lefebvre, A.,
Andrieux-Loyer, F., Blauw, A. N., Bryère, P., Devreker, D., Garnesson,
P., Hernández Fariñas, T., Lamaury, Y., Lampert, L., Lavigne, H.,
Menet-Nedelec, F., Pardo, S., and Saulquin, B.: Twenty years of satellite and
in situ observations of surface chlorophyll-a from the northern Bay of
Biscay to the eastern English Channel. Is the water quality improving?,
Remote Sens. Environ., 233, 111343,
https://doi.org/10.1016/j.rse.2019.111343, 2019.
Goubert, E., Menier, D., Traini, C., Mathew, M. J., and Le Gall, R.:Recent Morphobathymetrical Changes of the Vilaine Estuary (South Brittany, France): Discrimination of Natural and Anthropogenic Forcings and Assessment for Future Trends, Elsevier, Coastal Zone Management, 485–500, ISBN 978-0-12-814350, 2019.
Guillaud, J.-F., Aminot, A., Delmas, D., Gohin, F., Lunven, M., Labry, C.,
and Herbland, A.: Seasonal variation of riverine nutrient inputs in the
northern Bay of Biscay (France), and patterns of marine phytoplankton
response, J. Marine Syst., 72, 309–319,
https://doi.org/10.1016/j.jmarsys.2007.03.010, 2008.
Hofmann, A. F., Soetaert, K., and Middelburg, J. J.: Present nitrogen and carbon dynamics in the Scheldt estuary using a novel 1-D model, Biogeosciences, 5, 981–1006, https://doi.org/10.5194/bg-5-981-2008, 2008.
Howarth, R., Chan, F., Conley, D. J, Garnier, J., Doney, S. C., Marino, R., and Billen, G.: Coupled Biogeochemical Cycles: Eutrophication and Hypoxia in Temperate Estuaries and Coastal Marine Ecosystems, Front. Ecol. Environ., 9, 18–26, https://doi.org/10.1890/100008, 2011.
Howarth, R. W., Fruci, J. R., and Sherman, D.: Inputs of Sediment and Carbon
to an Estuarine Ecosystem: Influence of Land Use, Ecol. Appl., 1, 27–39,
https://doi.org/10.2307/1941845, 1991.
Hu, J. and Li, S.: Modeling the mass fluxes and transformations of nutrients
in the Pearl River Delta, China, J. Marine Syst., 78, 146–167,
https://doi.org/10.1016/j.jmarsys.2009.05.001, 2009.
Husson, B., Hernández-Fariñas, T., Le Gendre, R., Schapira, M., and
Chapelle, A.: Two decades of Pseudo-nitzschia spp. blooms and king scallop
(Pecten maximus) contamination by domoic acid along the French Atlantic and
English Channel coasts: Seasonal dynamics, spatial heterogeneity and
interannual variability, Harmful Algae, 51, 26–39,
https://doi.org/10.1016/j.hal.2015.10.017, 2016.
INSEE: Populations légales 2014, available at:
https://www.insee.fr/fr/statistiques/2525755?sommaire=2525768#consulter-sommaire (last access: 7 February 2022),
2014.
Jakobsen, H. H. and Markager, S.: Carbon-to-chlorophyll ratio for
phytoplankton in temperate coastal waters: Seasonal patterns and
relationship to nutrients, Limnol. Oceanogr., 61, 1853–1868,
https://doi.org/10.1002/lno.10338, 2016.
Jay, D. A., Uncles, R. J., Largier, J., Geyer, W. R., Vallino, J., and
Boynton, W. R.: A Review of Recent Developments in Estuarine Scalar Flux
Estimation, Estuaries, 20, 262, https://doi.org/10.2307/1352342, 1997.
Kaiser, D., Unger, D., Qiu, G., Zhou, H., and Gan, H.: Natural and human
influences on nutrient transport through a small subtropical Chinese
estuary, Sci. Total Environ., 450–451, 92–107,
https://doi.org/10.1016/j.scitotenv.2013.01.096, 2013.
Kobori, H. and Taga, N.: Phosphatase activity and its rôle in the mineralization of organic phosphorus in coastal sea water, J. Exp. Mar. Bio. Ecol., 36, 23–39, https://doi.org/10.1016/0022-0981(79)90098-4, 1979.
Labry, C., Delmas, D., Youenou, A., Quere, J., Leynaert, A., Fraisse, S., Raimonet, M., and Ragueneau, O.: High alkaline phosphatase activity in phosphate replete waters: The case of two macrotidal estuaries, Limnol. Oceanogr., 61, 1513–1529, https://doi.org/10.1002/lno.10315, 2016.
Lajaunie-Salla, K., Wild-Allen, K., Sottolichio, A., Thouvenin, B., Litrico,
X., and Abril, G.: Impact of urban effluents on summer hypoxia in the highly
turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment
transport and biogeochemical processes, J. Marine Syst., 174, 89–105,
https://doi.org/10.1016/j.jmarsys.2017.05.009, 2017.
Lamy, D., Artigas, L. F., Jauzein, C., Lizon, F., and Cornille, V.: Coastal
bacterial viability and production in the eastern English Channel: A case
study during a Phaeocystis globosa bloom, J. Sea Res., 56, 227–238,
https://doi.org/10.1016/j.seares.2006.04.003, 2006.
Laruelle, G. G., Goossens, N., Arndt, S., Cai, W.-J., and Regnier, P.: Air–water CO2 evasion from US East Coast estuaries, Biogeosciences, 14, 2441–2468, https://doi.org/10.5194/bg-14-2441-2017, 2017.
Laruelle, G. G., Marescaux, A., Gendre, R. Le, Garnier, J., Rabouille, C.,
Thieu, V., and Lehrter, J. C.: Carbon Dynamics Along the Seine River
Network: Insight From a Coupled Estuarine/River Modeling Approach,
6, 1–16, https://doi.org/10.3389/fmars.2019.00216, 2019.
Lazure, P. and Dumas, F.: An external–internal mode coupling for a 3D
hydrodynamical model for applications at regional scale (MARS), Adv. Water
Resour., 31, 233–250, https://doi.org/10.1016/j.advwatres.2007.06.010, 2008.
Lefebvre, A., Guiselin, N., Barbet, F., and Artigas, F. L.: Long-term
hydrological and phytoplankton monitoring (1992–2007) of three potentially
eutrophic systems in the eastern English Channel and the Southern Bight of
the North Sea, ICES J. Mar. Sci., 68, 2029–2043,
https://doi.org/10.1093/icesjms/fsr149, 2011.
Liquete, C., Piroddi, C., Drakou, E. G., Gurney, L., Katsanevakis, S.,
Charef, A., and Egoh, B.: Current Status and Future Prospects for the
Assessment of Marine and Coastal Ecosystem Services: A Systematic Review,
edited by S. J. Bograd, PLoS One, 8, e67737,
https://doi.org/10.1371/journal.pone.0067737, 2013.
Lockhart, K. M., King, A. M., and Harter, T.: Identifying sources of
groundwater nitrate contamination in a large alluvial groundwater basin with
highly diversified intensive agricultural production, J. Contam. Hydrol.,
151, 140–154, https://doi.org/10.1016/j.jconhyd.2013.05.008, 2013.
Luu, T. N. M., Garnier, J., Billen, G., Le, T. P. Q., Nemery, J., Orange, D.,
and Le, L. A.: N, P, Si budgets for the Red River Delta (northern Vietnam):
How the delta affects river nutrient delivery to the sea, Biogeochemistry,
107, 241–259, https://doi.org/10.1007/s10533-010-9549-8, 2012.
McLean, M. J., Mouillot, D., Goascoz, N., Schlaich, I., and Auber, A.:
Functional reorganization of marine fish nurseries under climate warming,
Glob. Change Biol., 25, 660–674, https://doi.org/10.1111/gcb.14501, 2019.
Ménesguen, A., Dussauze, M., and Dumas, F.: Designing optimal scenarios
of nutrient loading reduction in a WFD/MSFD perspective by using passive
tracers in a biogeochemical-3D model of the English Channel/Bay of Biscay
area, Ocean Coast. Manage., 163, 37–53,
https://doi.org/10.1016/j.ocecoaman.2018.06.005, 2018a.
Ménesguen, A., Desmit, X., Dulière, V., Lacroix, G., Thouvenin, B.,
Thieu, V., and Dussauze, M.: How to avoid eutrophication in coastal seas? A
new approach to derive river-specific combined nitrate and phosphate maximum
concentrations, Sci. Total Environ., 628–629, 400–414,
https://doi.org/10.1016/j.scitotenv.2018.02.025, 2018b.
Ménesguen, A., Dussauze, M., Dumas, F., Thouvenin, B., Garnier, V.,
Lecornu, F., and Répécaud, M.: Ecological model of the Bay of Biscay
and English Channel shelf for environmental status assessment part 1:
Nutrients, phytoplankton and oxygen, Ocean Model., 133,
56–78, https://doi.org/10.1016/j.ocemod.2018.11.002, 2019.
Michel, P., Boutier, B., and Chiffoleau, J. F.: Net fluxes of dissolved
arsenic, cadmium, copper, zinc, nitrogen and phosphorus from the Gironde
Estuary (France): Seasonal variations and trends, Estuar. Coast. Shelf S.,
51, 451–462, https://doi.org/10.1006/ecss.2000.0691, 2000.
Middelburg, J. J. and Herman, P. M. J.: Organic matter processing in tidal
estuaries, Mar. Chem., 106, 127–147,
https://doi.org/10.1016/j.marchem.2006.02.007, 2007.
Modéran, J., David, V., Bouvais, P., Richard, P., and Fichet, D.: Organic
matter exploitation in a highly turbid environment: Planktonic food web in
the Charente estuary, France, Estuar. Coast. Shelf S., 98, 126–137,
https://doi.org/10.1016/j.ecss.2011.12.018, 2012.
Moriasi, D. N., Arnold, J. G., Van Liew, M. W., Bingner, R. L., Harmel, R.
D., and Veith, T. L.: Model Evaluation Guidelines for Systematic
Quantification of Accuracy in Watershed Simulations, T. ASABE, 50,
885–900, https://doi.org/10.13031/2013.23153, 2007.
Nguyen, A. T., Némery, J., Gratiot, N., Garnier, J., Dao, T. S., Thieu,
V., and Laruelle, G. G.: Biogeochemical functioning of an urbanized tropical
estuary: Implementing the generic C-GEM (reactive transport) model, Sci.
Total Environ., 784, 147261, https://doi.org/10.1016/j.scitotenv.2021.147261, 2021.
Nguyen, T. T. N., Némery, J., Gratiot, N., Garnier, J., Strady, E.,
Tran, V. Q., Nguyen, A. T., Nguyen, T. N. T., Golliet, C., and Aimé, J.:
Phosphorus adsorption/desorption processes in the tropical Saigon River
estuary (Southern Vietnam) impacted by a megacity, Estuar. Coast. Shelf
S., 227, 106321, https://doi.org/10.1016/j.ecss.2019.106321, 2019.
Nixon, S. W., Ammerman, J. W., Atkinson, L. P., Berounsky, V. M., Billen,
G., Boicourt, W. C., Boynton, W. R., Church, T. M., Ditoro, D. M., Elmgren,
R., Garber, J. H., Giblin, A. E., Jahnke, R. A., Owens, N. J. P., Pilson, M.
E. Q., and Seitzinger, S. P.: The fate of nitrogen and phosphorus at the
land-sea margin of the North Atlantic Ocean, Biogeochemistry, 35,
141–180, https://doi.org/10.1007/BF02179826, 1996.
Normandin, C., Lubac, B., Sottolichio, A., Frappart, F., Ygorra, B., and
Marieu, V.: Analysis of Suspended Sediment Variability in a Large Highly
Turbid Estuary Using a 5-Year-Long Remotely Sensed Data Archive at High
Resolution, J. Geophys. Res.-Ocean, 124, 7661–7682,
https://doi.org/10.1029/2019JC015417, 2019.
Perez, B. C., Day, J. W., Justic, D., Lane, R. R., and Twilley, R. R.:
Nutrient stoichiometry, freshwater residence time, and nutrient retention in
a river-dominated estuary in the Mississippi delta, Hydrobiologia, 658,
41–54, https://doi.org/10.1007/s10750-010-0472-8, 2011.
Pozdnyakov, D. V, Pettersson, L. H., and Korosov, A. A.: Exploring the Marine
Ecology from Space, Springer International Publishing, Cham., ISBN 978-3-3193-007-57, 2017.
Pritchard, D. W.: What is an estuary: physical viewpoint, in: Estuaries,
AAAS, Washington DC, 3–5, Pub. 83, 1967.
Ragueneau, O., Chauvaud, L., Leynaert, A., Thouzeau, G., Paulet, Y.-M., Bonnet, S., Lorrain, A., Grall, J., Corvaisier, R., Le Hir, M., Jean, F., and Clavier, J.: Direct evidence of a biologically active coastal silicate pump: ecological implications, Limnol. Oceanogr., 47, 1849–1854, 2002.
Ratmaya, W., Soudant, D., Salmon-Monviola, J., Plus, M., Cochennec-Laureau, N., Goubert, E., Andrieux-Loyer, F., Barillé, L., and Souchu, P.: Reduced phosphorus loads from the Loire and Vilaine rivers were accompanied by increasing eutrophication in the Vilaine Bay (south Brittany, France), Biogeosciences, 16, 1361–1380, https://doi.org/10.5194/bg-16-1361-2019, 2019.
Redfield, A. C., Ketchum, B. H., and Richards, F. A.: The Influence of
Organisms on the Composition of the Sea Water, in: The Sea,
edited by: Hill, M. N., Vol. 2, Interscience Publishers, New York, 26–77,
1963.
Regnier, P., Mouchet, A., Wollast, R., and Ronday, F.: A discussion of
methods for estimating residual fluxes in strong tidal estuaries, Cont.
Shelf Res., 18, 1543–1571, https://doi.org/10.1016/S0278-4343(98)00071-5, 1998.
Regnier, P., Arndt, S., Goossens, N., Volta, C., Laruelle, G. G., Lauerwald,
R., and Hartmann, J.: Modelling Estuarine Biogeochemical Dynamics: From the
Local to the Global Scale, Aquat. Geochem., 19, 591–626,
https://doi.org/10.1007/s10498-013-9218-3, 2013.
REPHY: French Observation and Monitoring program for Phytoplankton and
Hydrology in coastal waters. Metropolitan data, SEANOE [data set],
https://doi.org/10.17882/47248, 2021.
Roubeix, V., Rousseau, V., and Lancelot, C.: Diatom succession and silicon removal from freshwater in estuarine mixing zones: From experiment to modelling, Estuar. Coast. Shelf S., 78, 14–26, https://doi.org/10.1016/j.ecss.2007.11.007, 2008.
Romero, E., Garnier, J., Lassaletta, L., Billen, G., Le Gendre, R., Riou, P.,
and Cugier, P.: Large-scale patterns of river inputs in southwestern Europe:
Seasonal and interannual variations and potential eutrophication effects at
the coastal zone, Biogeochemistry, 113, 481–505,
https://doi.org/10.1007/s10533-012-9778-0, 2013.
Romero, E., Le Gendre, R., Garnier, J., Billen, G., Fisson, C., Silvestre,
M., and Riou, P.: Long-term water quality in the lower Seine: Lessons learned
over 4 decades of monitoring, Environ. Sci. Policy, 58, 141–154,
https://doi.org/10.1016/j.envsci.2016.01.016, 2016.
Romero, E., Garnier, J., Billen, G., Ramarson, A., Riou, P., and Le Gendre,
R.: Modeling the biogeochemical functioning of the Seine estuary and its
coastal zone: Export, retention, and transformations, Limnol. Oceanogr.,
64, 895–912, https://doi.org/10.1002/lno.11082, 2019.
Savenije, H. H. G.: Salinity and tides in alluvial estuaries,
available at:
http://hubertsavenije.files.wordpress.com/2014/01/salinityandtides2_21.pdf (last access: 20 September 2020), 2012.
Savoye, N., David, V., Morisseau, F., Etcheber, H., Abril, G., Billy, I.,
Charlier, K., Oggian, G., Derriennic, H., and Sautour, B.: Origin and
composition of particulate organic matter in a macrotidal turbid estuary:
The Gironde Estuary, France, Estuar. Coast. Shelf S., 108, 16–28,
https://doi.org/10.1016/j.ecss.2011.12.005, 2012.
Sebilo, M., Billen, G., Mayer, B., Billiou, D., Grably, M., Garnier, J., and
Mariotti, A.: Assessing nitrification and denitrification in the seine river
and estuary using chemical and isotopic techniques, Ecosystems, 9,
564–577, https://doi.org/10.1007/s10021-006-0151-9, 2006.
Seitzinger, S. P.: Denitrification in freshwater and coastal marine
ecosystems: Ecological and geochemical significance, Limnol. Oceanogr.,
33, 702–724, https://doi.org/10.4319/lo.1988.33.4part2.0702, 1988.
Soetaert, K., Middelburg, J. J., Herman, P. M. J., and Buis, K.: On the coupling
of benthic and pelagic biogeochemical models, Earth-Sci. Rev.,
51, 173–201, https://doi.org/10.1016/S0012-8252(00)00004-0, 2000.
Soletchnik, P., Ropert, M., Mazurié, J., Gildas Fleury, P., and Le Coz,
F.: Relationships between oyster mortality patterns and environmental data
from monitoring databases along the coasts of France, Aquaculture,
271, 384–400, https://doi.org/10.1016/j.aquaculture.2007.02.049, 2007.
Thouvenin, B., Gonzalez, J., and Boutier, B.: Modelling of pollutant
behaviour in estuaries: Application to cadmium in the Loire estuary, Mar.
Chem., 58, 147–161, https://doi.org/10.1016/S0304-4203(97)00031-5, 1997.
Toublanc, F., Brenon, I., Coulombier, T., and Le Moine, O.: Fortnightly tidal
asymmetry inversions and perspectives on sediment dynamics in a macrotidal
estuary (Charente, France), Cont. Shelf Res., 94, 42–54,
https://doi.org/10.1016/j.csr.2014.12.009, 2015.
Urban Wastewater Treatment Directive: UWWTD (Urban wastewater treatment
Directive) (1991) 91/271/CEE du Conseil, du 21 mai 1991, relative au
traitement des eaux urbaines résiduaires, https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=celex:31991L0271 (last access: 7 February 2022) 1991.
Vanderborght, J. P., Folmer, I. M., Aguilera, D. R., Uhrenholdt, T., and
Regnier, P.: Reactive-transport modelling of C, N, and O2 in a
river-estuarine-coastal zone system: Application to the Scheldt estuary,
Mar. Chem., 106, 92–110, https://doi.org/10.1016/j.marchem.2006.06.006,
2007.
Verri, G., Mahmoudi Kurdistani, S., Coppini, G., and Valentini, A.: Recent
Advances of a Box Model to Represent the Estuarine Dynamics: Time-Variable
Estuary Length and Eddy Diffusivity, J. Adv. Model. Earth Sy., 13,
1–16, https://doi.org/10.1029/2020MS002276, 2021.
Vilas, F., Rubio, B., Rey, D., and Bernabeu, A. M.: Estuary, in: Encyclopedia
of Planetary Landforms, 1–7, Springer, New York, NY, https://doi.org/10.1007/978-1-4614-3134-3, 2021.
Volta, C., Arndt, S., Savenije, H. H. G., Laruelle, G. G., and Regnier, P.: C-GEM (v 1.0): a new, cost-efficient biogeochemical model for estuaries and its application to a funnel-shaped system, Geosci. Model Dev., 7, 1271–1295, https://doi.org/10.5194/gmd-7-1271-2014, 2014.
Volta, C., Laruelle, G. G., Arndt, S., and Regnier, P.: Linking biogeochemistry to hydro-geometrical variability in tidal estuaries: a generic modeling approach, Hydrol. Earth Syst. Sci., 20, 991–1030, https://doi.org/10.5194/hess-20-991-2016, 2016a.
Volta, C., Laruelle, G. G., and Regnier, P.: Regional carbon and CO2 budgets
of North Sea tidal estuaries, Estuar. Coast. Shelf S., 176, 76–90,
https://doi.org/10.1016/j.ecss.2016.04.007, 2016b.
Wild-Allen, K., Skerratt, J., Whitehead, J., Rizwi, F., and Parslow, J.:
Mechanisms driving estuarine water quality: A 3D biogeochemical model
forinformed management, Estuar. Coast. Shelf S., 135, 33–45,
https://doi.org/10.1016/j.ecss.2013.04.009, 2013.
Short summary
Estuaries are key reactive ecosystems along the land–ocean aquatic continuum and are often strongly impacted by anthropogenic activities. We calculated nutrient in and out fluxes by using a 1-D transient model for seven estuaries along the French Atlantic coast. Among these, large estuaries with high residence times showed higher retention rates than medium and small ones. All reveal coastal eutrophication due to the excess of diffused nitrogen from intensive agricultural river basins.
Estuaries are key reactive ecosystems along the land–ocean aquatic continuum and are often...
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