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A comparison between water circulation and terrestrially-driven dissolved silica fluxes to the Mediterranean Sea traced using radium isotopes

dc.rights.licenseopenen_US
hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorTAMBORSKI, Joseph
hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorBEJANNIN, Simon
hal.structure.identifierUniversitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
dc.contributor.authorGARCIA-ORELLANA, Jordi
hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorSOUHAUT, Marc
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCHARBONNIER, Celine
IDREF: 176318933
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorANSCHUTZ, Pierre
hal.structure.identifierLaboratoire d'Océanographie Microbienne [LOMIC]
dc.contributor.authorPUJO-PAY, Mireille
hal.structure.identifierLaboratoire d'Océanographie Microbienne [LOMIC]
dc.contributor.authorCONAN, Pascal
hal.structure.identifierLaboratoire d'Océanographie Microbienne [LOMIC]
dc.contributor.authorCRISPI, Olivier
hal.structure.identifierGéosciences Environnement Toulouse [GET]
dc.contributor.authorMONNIN, Christophe
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
hal.structure.identifierCentre for Tropical Water Research & Aquatic Ecosystem Research (TropWATER)
dc.contributor.authorSTIEGLITZ, Thomas
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorRODELLAS, Valenti
hal.structure.identifierVrije Universiteit Brussel [Bruxelles] [VUB]
dc.contributor.authorANDRISOA, Aladin
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorCLAUDE, Christelle
hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorVAN BEEK, Pieter
dc.date.accessioned2024-05-17T11:45:12Z
dc.date.available2024-05-17T11:45:12Z
dc.date.issued2018
dc.identifier.issn0016-7037en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199921
dc.description.abstractEnThe circulation of seawater through permeable coastal sediments is increasingly recognized as an important source of nutrients, including dissolved silica (DSi), to the coastal ocean. Here, we utilized a Ra isotope (223 Ra, 224 Ra ex , 228 Ra) mass balance to quantify DSi fluxes driven by water circulation to a small shallow coastal lagoon (La Palme; French Mediter-ranean) during June 2016, as compared to karstic groundwater spring inputs. The DSi flux driven by lagoon water circulation (derived from 224 Ra ex) was approximately one order of magnitude greater (1900 ± 1700 mol d À1) than the DSi load of the karstic groundwater spring (250 ± 50 mol d À1) and greater than molecular diffusion (970 ± 750 mol d À1). Lagoon water circulation was a negligible source of 228 Ra, indicating that circulation-driven DSi inputs occur over a timescale of days. Offshore transects were studied to quantify fluxes of marine-derived submarine groundwater discharge (SGD) from the permeable sandy coastline adjacent to the lagoon, into the Mediterranean Sea. Surface water transects revealed near-shore enrichments of Ra and DSi, attributed to wave-setup and water exchange through the permeable beach between the lagoon and the sea. Upscaling over the 9.5 km stretch of sandy beaches results in a marine SGD-driven DSi flux of 2.3 ± 1.3 Â 10 4 mol d À1 , similar in magnitude to the Têt river during November 2016 (3.3 ± 2.4 Â 10 4 mol d À1), the largest river in the region. A positive relationship between DSi and 224 Ra ex in lagoon water and seawater, but not 228 Ra, suggests that 224 Ra ex and DSi enrichments are derived from a similar source, the sediment (i.e. lithogenic particle dissolution), operating on short timescales. A marine SGD-driven DSi flux to the Gulf of Lions (3.8 ± 2.2 Â 10 5 mol d À1) is likely continuous over time. The relatively constant DSi inputs from water circulation for the shallow lagoons and beaches along the French Mediterranean Sea
dc.description.sponsorshipINITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE - ANR-11-IDEX-0001en_US
dc.language.isoENen_US
dc.subject.enPore water exchange
dc.subject.enRadium isotopes
dc.subject.enSubmarine groundwater discharge
dc.subject.enMediterranean Sea
dc.subject.enDissolved silica
dc.subject.enCirculation
dc.title.enA comparison between water circulation and terrestrially-driven dissolved silica fluxes to the Mediterranean Sea traced using radium isotopes
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.gca.2018.07.022en_US
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnementen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
bordeaux.journalGeochimica et Cosmochimica Actaen_US
bordeaux.page496-515en_US
bordeaux.volume238en_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-01986094
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
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