Impact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation
| dc.rights.license | open | en_US |
| hal.structure.identifier | Laboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG] | |
| dc.contributor.author | HULOT, Vivien | |
| hal.structure.identifier | Laboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG] | |
| dc.contributor.author | METZGER, Edouard | |
| hal.structure.identifier | Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM] | |
| dc.contributor.author | DE CHANVALON, Aubin Thibault | |
| hal.structure.identifier | Laboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG] | |
| dc.contributor.author | MOURET, Aurélia | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | SCHMIDT, Sabine
IDREF: 131836129 | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | DEFLANDRE, Bruno
IDREF: 170923509 | |
| hal.structure.identifier | Détection, évaluation, gestion des risques CHROniques et éMErgents (CHROME) / Université de Nîmes [CHROME] | |
| dc.contributor.author | RIGAUD, Sylvain | |
| hal.structure.identifier | Laboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG] | |
| dc.contributor.author | BENETEAU, Eric | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | SAVOYE, Nicolas
ORCID: 0000-0001-6433-8519 IDREF: 067128637 | |
| hal.structure.identifier | Laboratoire Environnement Ressources Morbihan Pays de Loire [LERMPL] | |
| dc.contributor.author | SOUCHU, Philippe | |
| hal.structure.identifier | Laboratoire Environnement Ressources Morbihan Pays de Loire [LERMPL] | |
| dc.contributor.author | LE MERRER, Yoann | |
| hal.structure.identifier | Laboratoire de Planétologie et Géosciences - Angers [LPG-ANGERS] | |
| hal.structure.identifier | Laboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG] | |
| dc.contributor.author | MAILLET, Grégoire | |
| dc.date.accessioned | 2024-01-29T13:15:19Z | |
| dc.date.available | 2024-01-29T13:15:19Z | |
| dc.date.issued | 2023-02-16 | |
| dc.identifier.issn | 2296-7745 | en_US |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/187594 | |
| dc.description.abstractEn | Despite 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.iso | EN | en_US |
| dc.subject.en | estuary | |
| dc.subject.en | flood | |
| dc.subject.en | hypoxia | |
| dc.subject.en | oxides-phosphorus interactions | |
| dc.subject.en | water sediment exchanges | |
| dc.subject.en | estuary | |
| dc.title.en | Impact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation | |
| dc.type | Article de revue | en_US |
| dc.identifier.doi | 10.3389/fmars.2023.1083377 | en_US |
| dc.subject.hal | Chimie | en_US |
| dc.subject.hal | Chimie/Chimie analytique | en_US |
| bordeaux.journal | Frontiers in Marine Science | en_US |
| bordeaux.volume | 10 | en_US |
| bordeaux.hal.laboratories | EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.team | ECOBIOC | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | hal | |
| hal.identifier | hal-04046714 | |
| hal.version | 1 | |
| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
| hal.export | false | |
| workflow.import.source | hal | |
| dc.rights.cc | CC BY | en_US |
| bordeaux.COinS | ctx_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 |
