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Impact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation

dc.rights.licenseopenen_US
hal.structure.identifierLaboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG]
dc.contributor.authorHULOT, Vivien
hal.structure.identifierLaboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG]
dc.contributor.authorMETZGER, Edouard
hal.structure.identifierInstitut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
dc.contributor.authorDE CHANVALON, Aubin Thibault
hal.structure.identifierLaboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG]
dc.contributor.authorMOURET, Aurélia
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHMIDT, Sabine
IDREF: 131836129
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDEFLANDRE, Bruno
IDREF: 170923509
hal.structure.identifierDétection, évaluation, gestion des risques CHROniques et éMErgents (CHROME) / Université de Nîmes [CHROME]
dc.contributor.authorRIGAUD, Sylvain
hal.structure.identifierLaboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG]
dc.contributor.authorBENETEAU, Eric
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSAVOYE, Nicolas
ORCID: 0000-0001-6433-8519
IDREF: 067128637
hal.structure.identifierLaboratoire Environnement Ressources Morbihan Pays de Loire [LERMPL]
dc.contributor.authorSOUCHU, Philippe
hal.structure.identifierLaboratoire Environnement Ressources Morbihan Pays de Loire [LERMPL]
dc.contributor.authorLE MERRER, Yoann
hal.structure.identifierLaboratoire de Planétologie et Géosciences - Angers [LPG-ANGERS]
hal.structure.identifierLaboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG]
dc.contributor.authorMAILLET, Grégoire
dc.date.accessioned2024-01-29T13:15:19Z
dc.date.available2024-01-29T13:15:19Z
dc.date.issued2023-02-16
dc.identifier.issn2296-7745en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187594
dc.description.abstractEnDespite 20 years of control on eutrophication, episodes of summer hypoxia still occur in the Loire estuary, impacting water quality and posing a key scientific and management challenge. This work aimed to quantify the contribution of the benthic compartment to hypoxia in the Loire estuary by direct measurement of water-sediment fluxes and an in-depth understanding of the seasonal variations of oxides and phosphorus stocks. During the summer's low-discharge period, results show that the iron oxide-rich deposit is stable under hypoxic conditions, limiting the release of dissolved phosphorus into the overlying water column. The high nitrate content of the water column appears to be an important oxidizer of iron during hypoxic periods, limiting dissolved phosphorus leakage and aggravation of hypoxia. During the exceptional winter flood, significant sediment erosion associated with bubbling phenomena (attributed to methane efflux) created severe fractures in the sediment and stimulated water-sediment exchange. During the following months, these fractures were progressively filled, which decreased the intensity of benthic fluxes. However, due to the high residence time in the water during the summer period, a simple model demonstrated that benthic contributions were sufficient to directly (by direct oxygen consumption) or indirectly (by promoting ammonia oxidation) affect the oxygen stock in the water column during the low-discharge period. Our study demonstrates the importance of the benthic compartment in the occurrence of hypoxia and the obvious lack of knowledge to illustrate and model the biogeochemical functioning of the estuary.
dc.language.isoENen_US
dc.subject.enestuary
dc.subject.enflood
dc.subject.enhypoxia
dc.subject.enoxides-phosphorus interactions
dc.subject.enwater sediment exchanges
dc.subject.enestuary
dc.title.enImpact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation
dc.typeArticle de revueen_US
dc.identifier.doi10.3389/fmars.2023.1083377en_US
dc.subject.halChimieen_US
dc.subject.halChimie/Chimie analytiqueen_US
bordeaux.journalFrontiers in Marine Scienceen_US
bordeaux.volume10en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04046714
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Frontiers%20in%20Marine%20Science&rft.date=2023-02-16&rft.volume=10&rft.eissn=2296-7745&rft.issn=2296-7745&rft.au=HULOT,%20Vivien&METZGER,%20Edouard&DE%20CHANVALON,%20Aubin%20Thibault&MOURET,%20Aur%C3%A9lia&SCHMIDT,%20Sabine&rft.genre=article


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