Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)

19 pages, 2 tables, 8 figures.-- This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY)

Detalhes bibliográficos
Autores: Calvo-Martín, Elisa, Álvarez-Salgado, Xosé Antón, Rocha, Carlos, Ibánhez, J. Severino P.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/258667
Acesso em linha:http://hdl.handle.net/10261/258667
Access Level:acceso abierto
Palavra-chave:Subterranean estuary
Groundwater discharge
Radon
Dissolved oxygen
Nitrogen cycling
Ría de Vigo
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spelling Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)Calvo-Martín, ElisaÁlvarez-Salgado, Xosé AntónRocha, CarlosIbánhez, J. Severino P.Subterranean estuaryGroundwater dischargeRadonDissolved oxygenNitrogen cyclingRía de Vigo19 pages, 2 tables, 8 figures.-- This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY)Subterranean estuaries (STEs), where continental groundwaters and saltwaters meet, are zones of intense biogeochemical reactivity. As such, STEs significantly modify groundwater-borne nutrient fluxes to the coastal zone. Thus, evaluating their reactive role is crucial to anticipate impacts of submarine groundwater discharge (SGD) over coastal ecosystems. Here, we studied the nitrogen biogeochemistry of two STEs with contrasting wave-exposure and redox conditions in Panxón and Ladeira beaches (Ría de Vigo, NW Iberian Peninsula). Seasonal surveys were performed at the permanently saturated zone of both beaches during low tide in February, May, July, and October 2019. Sediment was sampled and porewater samples collected using push-pull piezometers. Salinity, 222Rn and 226Ra activities were used to trace water circulation inside each beach. Porewater nitrate, ammonium, nitrite and dissolved oxygen were used to evaluate the role of these STEs as reactive sinks or sources of inorganic nitrogen. Our results showed a marked seasonal variability of water circulation inside both beaches, with strong salinity gradients in February and May and weakened circulation in July and October. The presence of a gravel layer in Panxón beach completely altered the typical structure of STEs by increasing porewater transport and mixing through the beach interior. As a result, Panxón beach profiles were highly enriched in nitrate and oxygen. Conversely, suboxic, and anoxic conditions were prevalent in Ladeira beach during the study period, with ammonium being the prevailing inorganic nitrogen form. High nitrate concentrations occurred associated to the tidal circulation cell during February and May, being the only effective mechanism of sediment oxygenation in Ladeira beach. Although nitrate reduction and production were observed in both STEs, comparison with averaged conservative mixing porewater profiles showed that Ladeira beach acted as a net nitrogen sink whereas Panxón beach acted as a net nitrogen source. The presence of a gravel layer oxygenates the interior of Panxón beach, thus limiting nitrate reduction and promoting the amplification of groundwater-borne nitrogen fluxes to the coastThis research was supported by the SUBACID project (SUBmarine groundwater discharge (SGD) impact on coastal ACIDification processes in contrasting Atlantic Shores: towards securing ecosystem services and food production) that has received funding from the Irish Research Council and the European Union’s Horizon 2020 Research and Innovation Program under the Marie Skłodowska-Curie grant agreement No. 713279 through the CAROLINE program (CLNE/2017/210)Peer reviewedFrontiers MediaIrish Research CouncilEuropean CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/258667reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/713279The underlying dataset has been published as supplementary material of the article in the publishers platform at DOI https://doi.org/10.3389/fmars.2021.626813https://doi.org/10.3389/fmars.2021.626813Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2586672026-05-22T06:33:51Z
dc.title.none.fl_str_mv Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
title Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
spellingShingle Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
Calvo-Martín, Elisa
Subterranean estuary
Groundwater discharge
Radon
Dissolved oxygen
Nitrogen cycling
Ría de Vigo
title_short Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
title_full Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
title_fullStr Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
title_full_unstemmed Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
title_sort Reactive Solute Transport Through Two Contrasting Subterranean Estuary Exit Sites in the Ría de Vigo (NW Iberian Peninsula)
dc.creator.none.fl_str_mv Calvo-Martín, Elisa
Álvarez-Salgado, Xosé Antón
Rocha, Carlos
Ibánhez, J. Severino P.
author Calvo-Martín, Elisa
author_facet Calvo-Martín, Elisa
Álvarez-Salgado, Xosé Antón
Rocha, Carlos
Ibánhez, J. Severino P.
author_role author
author2 Álvarez-Salgado, Xosé Antón
Rocha, Carlos
Ibánhez, J. Severino P.
author2_role author
author
author
dc.contributor.none.fl_str_mv Irish Research Council
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Subterranean estuary
Groundwater discharge
Radon
Dissolved oxygen
Nitrogen cycling
Ría de Vigo
topic Subterranean estuary
Groundwater discharge
Radon
Dissolved oxygen
Nitrogen cycling
Ría de Vigo
description 19 pages, 2 tables, 8 figures.-- This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY)
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
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/10261/258667
url http://hdl.handle.net/10261/258667
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/713279
The underlying dataset has been published as supplementary material of the article in the publishers platform at DOI https://doi.org/10.3389/fmars.2021.626813
https://doi.org/10.3389/fmars.2021.626813
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Frontiers Media
publisher.none.fl_str_mv Frontiers Media
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 15,198674

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