Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia

16 pages, 1 table, 10 figures

Detalles Bibliográficos
Autores: Rocha, Carlos, Ibánhez, J. Severino P., Leote, Catarina
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2009
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/377342
Acceso en línea:http://hdl.handle.net/10261/377342
Access Level:acceso abierto
Palabra clave:Submarine
Groundwater
Discharge
Biogeochemistry
Nitrogen cycle
Coastal lagoons
Benthic environment
Permeable sediments
Portugal
Formosa
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spelling Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern IberiaRocha, CarlosIbánhez, J. Severino P.Leote, CatarinaSubmarineGroundwaterDischargeBiogeochemistryNitrogen cycleCoastal lagoonsBenthic environmentPermeable sedimentsPortugalFormosa16 pages, 1 table, 10 figuresTo investigate both the role of tides on the timing and magnitude of Submarine Groundwater Discharge (SGD), and the effect on benthic nitrogen biogeochemistry of nitrate-enriched brackish water percolating upwards at the seepage face, we conducted a study of SGD rates measured simultaneously with seepage meters and mini-piezometers, combined with sets (n = 39) of high resolution in-situ porewater profiles describing NH4+, NO3−, Si(OH)4 and salinity distribution with depth (0–20 cm). Sampling took place during two consecutive spring tidal cycles in four different months (November 2005, March, April and August 2006) at a backbarrier beach face in the Ria Formosa lagoon, southern Portugal. Our results show that the tide is one of the major agents controlling the timing and magnitude of SGD into the Ria Formosa. Intermittent pumping of brackish, nitrate-bearing water at the beach face through surface sediments changed both the magnitudes and depth distributions of porewater NH4+ and NO3− concentrations. The most significant changes in nitrate and ammonium concentrations were observed in near-surface sediment horizons coinciding with increased fraction of N in benthic organic matter, as shown by the organic C:N ratio. On the basis of mass balance calculations executed on available benthic profiles, providing ratios of net Ammonium Production Rate (APR) to Nitrate Reduction Rate (NRR), coupled to stoichiometric calculations based on the composition of organic matter, potential pathways of nitrogen transformation were speculated upon. Although the seepage face occasionally contributes to reduce the groundwater-borne DIN loading of the lagoon, mass balance analysis suggests that a relatively high proportion of the SGD-borne nitrogen flowing into the lagoon may be enhanced by nitrification at the shallow (1–3 cm) subsurface and modulated by dissimilatory nitrate reduction to ammonium (DNRA)These where jointly funded by Project O-DOIS (POCTI/CTA/47078/2002), financed by the Portuguese Science and Technology Foundation (FCT) and by CIMA (Centre for Marine and Environmental Research)Peer reviewedElsevierFundação para a Ciência e a Tecnologia (Portugal)Universidade do Algarve202520252009info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/377342reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.marchem.2009.06.003Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3773422026-05-22T06:33:51Z
dc.title.none.fl_str_mv Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
title Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
spellingShingle Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
Rocha, Carlos
Submarine
Groundwater
Discharge
Biogeochemistry
Nitrogen cycle
Coastal lagoons
Benthic environment
Permeable sediments
Portugal
Formosa
title_short Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
title_full Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
title_fullStr Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
title_full_unstemmed Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
title_sort Benthic nitrate biogeochemistry affected by tidal modulation of Submarine Groundwater Discharge (SGD) through a sandy beach face, Ria Formosa, Southwestern Iberia
dc.creator.none.fl_str_mv Rocha, Carlos
Ibánhez, J. Severino P.
Leote, Catarina
author Rocha, Carlos
author_facet Rocha, Carlos
Ibánhez, J. Severino P.
Leote, Catarina
author_role author
author2 Ibánhez, J. Severino P.
Leote, Catarina
author2_role author
author
dc.contributor.none.fl_str_mv Fundação para a Ciência e a Tecnologia (Portugal)
Universidade do Algarve
dc.subject.none.fl_str_mv Submarine
Groundwater
Discharge
Biogeochemistry
Nitrogen cycle
Coastal lagoons
Benthic environment
Permeable sediments
Portugal
Formosa
topic Submarine
Groundwater
Discharge
Biogeochemistry
Nitrogen cycle
Coastal lagoons
Benthic environment
Permeable sediments
Portugal
Formosa
description 16 pages, 1 table, 10 figures
publishDate 2009
dc.date.none.fl_str_mv 2009
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/377342
url http://hdl.handle.net/10261/377342
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.marchem.2009.06.003
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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
repository.mail.fl_str_mv
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score 15.81155

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