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Modeling the influence of rutrophication and redox conditions on mercury cycling at the sediment-water interface in the Berre Lagoon

2018Journal article Open access
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dc.contributor.authorPakhomova, Svetlana
dc.contributor.authorYakushev, Evgeniy
dc.contributor.authorProtsenko, Elizaveta
dc.contributor.authorRigaud, Sylvain
dc.contributor.authorCossa, Daniel
dc.contributor.authorKnoery, Joel
dc.contributor.authorCouture, Raoul-Marie
dc.contributor.authorRadakovitch, Olivier
dc.contributor.authorYakubov, Shamil
dc.contributor.authorKrzeminska, Dominika
dc.contributor.authorNewton, Alice
dc.date.accessioned2019-04-06T09:04:14Z
dc.date.available2019-04-06T09:04:14Z
dc.date.issued2018
dc.description.abstractThis study presents a specifically designed Mercury module in a coupled benthic-pelagic reactive-transport model - Bottom RedOx Model (BROM) that allows to study mercury (Hg) biogeochemistry under different conditions. This module considers the transformation of elemental mercury (Hg(O)), divalent mercury (Hg(II)) and methylmercury (MeHg). The behavior of mercury species in the model is interconnected with changes of oxygen, hydrogen sulfide, iron oxides, organic matter, and biota. We simulated the transformation and transport of Hg species in the water column and upper sediment layer under five different scenarios, combining various levels of oxygenation and trophic state in the Berre lagoon, a shallow eutrophic lagoon of the French Mediterranean coast subjected to seasonal anoxia. The first scenario represents the conditions in the lagoon that are compared with experimental data. The four other scenarios were produced by varying the biological productivity, using low and high nutrient (N and P) concentrations, and by varying the redox conditions using different intensity of vertical mixing in the water column. The results of the simulation show that both oxidized and reduced sediments can accumulate Hg, but any shifts in redox conditions in bottom water and upper sediment layer lead to the release of Hg species into the water column. Eutrophication and/or restricted vertical mixing lead to reducing conditions and intensify MeHg formation in the sediment with periodic release to the water column. Oxygenation of an anoxic water body can lead to the appearance of Hg species in the water column and uptake by organisms, whereby Hg may enter into the food web. The comparison of studied scenarios shows that a well-oxygenated eutrophic system favors the conditions for Hg species bioaccumulation with a potential adverse effect on the ecosystem. The research is relevant to the UN Minimata convention, EU policies on water, environmental quality standards and Mercury in particular.pt_PT
dc.description.sponsorshipVISTA - a basic research program Norwegian Academy of Science and Letters 6164 Statoil 6164 project PREDHYPO A*MIDEX project - Investissements d'Avenir French Government program ANR-11-IDEX-0001-02 Norwegian Research Council SKATTEfunn project Aquatic Modeling Tools 272749 NILU CIMA IMBER Future Earth Coasts Future Earth Ocean KANpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/fmars.2018.00291pt_PT
dc.identifier.issn2296-7745
dc.identifier.urihttp://hdl.handle.net/10400.1/12453
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Mediapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMercurypt_PT
dc.subjectMethylmercurypt_PT
dc.subjectBiogeochemical modelingpt_PT
dc.subjectAnoxiapt_PT
dc.subjectEutrophicationpt_PT
dc.subjectLagoonpt_PT
dc.subjectBROMpt_PT
dc.titleModeling the influence of rutrophication and redox conditions on mercury cycling at the sediment-water interface in the Berre Lagoonpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleFrontiers in Marine Sciencept_PT
oaire.citation.volume5pt_PT
person.familyNameNewton
person.givenNameAlice
person.identifier333937
person.identifier.ciencia-id6F13-1247-B2B7
person.identifier.orcid0000-0001-9286-5914
person.identifier.scopus-author-id7201391894
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication636c0a22-6cf2-4324-a704-64777269e97d
relation.isAuthorOfPublication.latestForDiscovery636c0a22-6cf2-4324-a704-64777269e97d

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