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Climatology and nutrient fluxes in the Tagus estuary: A coupled model application

2022-12Artigo científico Acesso restrito
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dc.contributor.authorde Pablo, Hilda
dc.contributor.authorSobrinho, João
dc.contributor.authorNunes, Susana
dc.contributor.authorCorreia, Alexandre
dc.contributor.authorNeves, Ramiro
dc.contributor.authorGaspar, Miguel
dc.date.accessioned2023-02-08T13:47:04Z
dc.date.available2023-02-08T13:47:04Z
dc.date.issued2022-12
dc.description.abstractRivers are responsible for the main transport of nutrients from land to estuaries and coastal areas. Understanding the fate of these anthropogenic inputs and their impacts on estuaries and adjacent marine ecosystems is essential for the protection of coastal waters. Here, the 3D MOHID hydrodynamic model coupled with a biogeochemical model was used to determine seasonal nutrient fluxes between areas of the Tagus estuary. For this purpose, the estuary was divided into boxes, which allowed to evaluate nutrients (and phytoplankton) exchanges between areas, to identify source and sink zones, to estimate the amount of nutrients exported to the coastal zone adjacent to the estuary, and to understand the recycling capacity of this estuarine system. Globally, for all nutrients and seasons, the highest net fluxes were observed in the main and central body of the estuary. The differences observed in the flux budget for each box and for all nutrients are mostly related to variations in the seasonal abundance of phytoplankton, which is much higher in Spring/Summer than in the rest of the year due to the higher seawater temperature and irradiance. During these seasons the high temperatures also promoted the fast mineralization of organic matter along the water column and in the sediment. For all seasons, an export of nutrients and phytoplankton from upstream to downstream was observer at the surface, and from the most confined areas of the southern margin into the central body and main channel of the estuary, whilst the opposite was observed in the bottom layers. Nevertheless, surface fluxes were always higher than those recorded at depth, indicating that the estuary exported nutrients to the coast, all year round. For 2020 it was estimated that 52%, 88% and 65% of the ammonium, nitrate, and phosphate, respectively, that entered the estuary from both rivers and wastewater treatment plants were exported to the adjacent coast. The amount of nutrients exported to the coastal area is closely related to river discharge, being much higher in flood years than in dry years, particularly for nitrate.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.ecss.2022.108129pt_PT
dc.identifier.eissn1096-0015
dc.identifier.urihttp://hdl.handle.net/10400.1/19021
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationLaboratory of Robotics and Engineering Systems
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subject3D-MOHIDpt_PT
dc.subjectModel validationpt_PT
dc.subjectNumerical modellingpt_PT
dc.subjectTagus estuarypt_PT
dc.subjectHydrodynamicspt_PT
dc.subjectNutrients fluxespt_PT
dc.subjectBiogeochemicalpt_PT
dc.titleClimatology and nutrient fluxes in the Tagus estuary: A coupled model applicationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleLaboratory of Robotics and Engineering Systems
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50009%2F2020/PT
oaire.citation.startPage108129pt_PT
oaire.citation.titleEstuarine, Coastal and Shelf Sciencept_PT
oaire.citation.volume279pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameGaspar
person.givenNameMiguel
person.identifier.ciencia-idF719-07AC-E41F
person.identifier.orcid0000-0001-9245-8518
person.identifier.ridF-5398-2011
person.identifier.scopus-author-id23501123500
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6185b7ee-acc9-4a7e-a7db-37384e94f4df
relation.isAuthorOfPublication.latestForDiscovery6185b7ee-acc9-4a7e-a7db-37384e94f4df
relation.isProjectOfPublication63f1f0ee-a2d4-4055-8a65-111048e05495
relation.isProjectOfPublication.latestForDiscovery63f1f0ee-a2d4-4055-8a65-111048e05495

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