Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system

14 pages, 13 figures, 1 table

Detalles Bibliográficos
Autores: Dale, Andrew W., Prego, R.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2002
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/26057
Acceso en línea:http://hdl.handle.net/10261/26057
Access Level:acceso abierto
Palabra clave:Upwelling
Denitrification
Nitrogen
Sediment
Hydrodynamics
Benthic-pelagic coupling
Pontevedra ria
Galicia
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spelling Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling systemDale, Andrew W.Prego, R.UpwellingDenitrificationNitrogenSedimentHydrodynamicsBenthic-pelagic couplingPontevedra riaGalicia14 pages, 13 figures, 1 tableSediment incubation microcosms, multitrap apparatus and water column variables have been employed to describe the dynamic changes in benthic-pelagic coupling between nutrient pools in the Pontevedra ria, NW Spain, during spring and summer 1998. A comparison of the chemical characteristics of suspended and bed sediment together with sediment nutrient effluxes revealed that particulate organic nitrogen and carbon were progressively depleted upon transit through the nutrient pools. The main fate of particulate organic nitrogen reaching the bed sediment is denitrification, although resuspension is also important. An estimate of net denitrification (Dnet) was made at 2 muddy sites in the ria with a mass balance at the benthic boundary layer. First-order approximations calculate Dnet to be 178 and 182 µmolN m-2 h-1 at the 2 stations, and agree well with previous modelling estimates. Denitrification is highest when upwelling relaxes and the flux of organic matter to the sediment increases. Regular inputs of offshore water ensure water renewal and re-oxygenation of bottom waters, thus preventing anoxia, particularly in the summer. With upwelling, large quantities of ammonium are effluxed to the water column (250 µmolNH4+ m-2 h-1), probably as a result of the bed sediment resuspension engendered by upwelling and stirring of phytodetrital fluff held in suspension as neutrally buoyant material above the sediment surface. We hypothesise that hydrodynamical processes play an important role in determining the quantity of nutrients remineralised in the Pontevedra ria and, in the case of nitrogen, the rate of denitrification at the benthic boundary layer.This work was supported by CICYT under the project ‘The hydrodynamics and biogeochemical cycle of silicon in the Pontevedra ria’, ref. MAR96-1782. A.W.D. was supported by a research grant jointly funded by CSIC (Spain) and the University of Plymouth (UK)Peer reviewedInter ResearchComisión Interministerial de Ciencia y Tecnología, CICYT (España)Consejo Superior de Investigaciones Científicas (España)Plymouth UniversityConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201020102002info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersion1012258 bytesapplication/pdfhttp://hdl.handle.net/10261/26057reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.3354/meps235015Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/260572026-05-22T06:33:51Z
dc.title.none.fl_str_mv Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
title Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
spellingShingle Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
Dale, Andrew W.
Upwelling
Denitrification
Nitrogen
Sediment
Hydrodynamics
Benthic-pelagic coupling
Pontevedra ria
Galicia
title_short Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
title_full Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
title_fullStr Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
title_full_unstemmed Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
title_sort Physico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling system
dc.creator.none.fl_str_mv Dale, Andrew W.
Prego, R.
author Dale, Andrew W.
author_facet Dale, Andrew W.
Prego, R.
author_role author
author2 Prego, R.
author2_role author
dc.contributor.none.fl_str_mv Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
Consejo Superior de Investigaciones Científicas (España)
Plymouth University
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Upwelling
Denitrification
Nitrogen
Sediment
Hydrodynamics
Benthic-pelagic coupling
Pontevedra ria
Galicia
topic Upwelling
Denitrification
Nitrogen
Sediment
Hydrodynamics
Benthic-pelagic coupling
Pontevedra ria
Galicia
description 14 pages, 13 figures, 1 table
publishDate 2002
dc.date.none.fl_str_mv 2002
2010
2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/26057
url http://hdl.handle.net/10261/26057
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.3354/meps235015
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1012258 bytes
application/pdf
dc.publisher.none.fl_str_mv Inter Research
publisher.none.fl_str_mv Inter Research
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
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score 15,811543

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