Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events
To evaluate the influence of upwelling events on nitrous oxide (N2O) levels and sea-air exchange in Setúbal Bay (SW Portugal), measurements of dissolved N2O were carried out from the surface down to 200 m depth in May 2006 and May 2007. During the weak upwelling event (May 2006), higher N2O concentr...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | México |
| Institución: | UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIA |
| Repositorio: | Ciencias Marinas |
| Idioma: | inglés |
| OAI Identifier: | oai:cienciasmarinas.com.mx:article/1787 |
| Acceso en línea: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1787 |
| Access Level: | acceso abierto |
| Palabra clave: | upwelling nitrous oxide sea-air fluxes Setúbal Bay surgencia óxido de nitrógeno disuelto flujos bahía de Setúbal |
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Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events Concentraciones y flujos de óxido de nitrógeno disuelto en la bahía de Setúbal, Portugal, durante los eventos de surgencia |
| title |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events |
| spellingShingle |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events Gonçalves, C upwelling nitrous oxide sea-air fluxes Setúbal Bay surgencia óxido de nitrógeno disuelto flujos bahía de Setúbal |
| title_short |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events |
| title_full |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events |
| title_fullStr |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events |
| title_full_unstemmed |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events |
| title_sort |
Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling events |
| dc.creator.none.fl_str_mv |
Gonçalves, C Brogueira, MJ Camões, MF |
| author |
Gonçalves, C |
| author_facet |
Gonçalves, C Brogueira, MJ Camões, MF |
| author_role |
author |
| author2 |
Brogueira, MJ Camões, MF |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
upwelling nitrous oxide sea-air fluxes Setúbal Bay surgencia óxido de nitrógeno disuelto flujos bahía de Setúbal |
| topic |
upwelling nitrous oxide sea-air fluxes Setúbal Bay surgencia óxido de nitrógeno disuelto flujos bahía de Setúbal |
| description |
To evaluate the influence of upwelling events on nitrous oxide (N2O) levels and sea-air exchange in Setúbal Bay (SW Portugal), measurements of dissolved N2O were carried out from the surface down to 200 m depth in May 2006 and May 2007. During the weak upwelling event (May 2006), higher N2O concentrations (values up to 14 nmol L–1) were observed in the upper and deeper layers. In the upper layers a positive correlation between ΔN2O (N2O excess) and apparent oxygen utilization was calculated, suggesting that nitrification contributed to N2O production. During the stronger upwelling event (May 2007), N2O values were lower and did not surpass 12 nmol L–1. Production of N2O could not be disentangled and apparently upwelling provided an effective pathway for ventilating N2O from subsurface waters to the atmosphere. Surface waters were, in general, supersaturated with respect to the atmosphere (percent saturation values 95–160%), indicating that the study area was acting as a source of atmospheric N2O. Higher upwelling-favorable winds (values up to 9 m s–1) registered in May 2007 contributed to increase N2O emissions, which attained a maximum value of 15.2 µmol m–2 d–1 in this period. Lower N2O sea-air fluxes were estimated in May 2006 and values did not surpass 8.8 µmol m–2 d–1. Taking into account the N2O flux in our study area, the contribution of Portuguese coastal upwelling to N2O emission was estimated, varying from 0.040 to 0.102 Gg N yr–1. These values are lower than those reported for most upwelling systems and represent a minor source to atmospheric N2O. |
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2011 |
| dc.date.none.fl_str_mv |
2011-04-26 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado |
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article |
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publishedVersion |
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https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1787 10.7773/cm.v38i1B.1787 |
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https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1787 |
| identifier_str_mv |
10.7773/cm.v38i1B.1787 |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
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https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1787/1664 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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Iniversidad Autónoma de Baja California |
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Iniversidad Autónoma de Baja California |
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Ciencias Marinas; Vol. 38 No. 1B (2012); 177-190 Ciencias Marinas; Vol. 38 Núm. 1B (2012); 177-190 2395-9053 0185-3880 reponame:Ciencias Marinas instname:UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIA instacron:UABC |
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UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIA |
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UABC |
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UABC |
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Ciencias Marinas |
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Ciencias Marinas |
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Nitrous oxide content and fluxes in Setúbal Bay, Portugal, during upwelling eventsConcentraciones y flujos de óxido de nitrógeno disuelto en la bahía de Setúbal, Portugal, durante los eventos de surgenciaGonçalves, CBrogueira, MJCamões, MFupwellingnitrous oxidesea-air fluxesSetúbal Baysurgenciaóxido de nitrógeno disueltoflujosbahía de SetúbalTo evaluate the influence of upwelling events on nitrous oxide (N2O) levels and sea-air exchange in Setúbal Bay (SW Portugal), measurements of dissolved N2O were carried out from the surface down to 200 m depth in May 2006 and May 2007. During the weak upwelling event (May 2006), higher N2O concentrations (values up to 14 nmol L–1) were observed in the upper and deeper layers. In the upper layers a positive correlation between ΔN2O (N2O excess) and apparent oxygen utilization was calculated, suggesting that nitrification contributed to N2O production. During the stronger upwelling event (May 2007), N2O values were lower and did not surpass 12 nmol L–1. Production of N2O could not be disentangled and apparently upwelling provided an effective pathway for ventilating N2O from subsurface waters to the atmosphere. Surface waters were, in general, supersaturated with respect to the atmosphere (percent saturation values 95–160%), indicating that the study area was acting as a source of atmospheric N2O. Higher upwelling-favorable winds (values up to 9 m s–1) registered in May 2007 contributed to increase N2O emissions, which attained a maximum value of 15.2 µmol m–2 d–1 in this period. Lower N2O sea-air fluxes were estimated in May 2006 and values did not surpass 8.8 µmol m–2 d–1. Taking into account the N2O flux in our study area, the contribution of Portuguese coastal upwelling to N2O emission was estimated, varying from 0.040 to 0.102 Gg N yr–1. These values are lower than those reported for most upwelling systems and represent a minor source to atmospheric N2O. Para evaluar la influencia de los eventos de surgencia en las concentraciones y flujos a la atmósfera del óxido de nitrógeno disuelto (N2O) en la bahía de Setúbal (SO de Portugal), se midió el N2O desde la superficie hasta una profundidad de 200 m en mayo de 2006 y mayo de 2007. Durante el afloramiento débil (mayo de 2006), las mayores concentraciones de N2O (valores de hasta 14 nmol L–1) fueron observadas en la capa superior y la capa más profunda de la columna de agua. En las capas superiores se detectó una correlación positiva entre el ΔN2O (exceso de N2O) y el consumo aparente de oxígeno, lo que sugiere que la nitrificación contribuyó a la producción de N2O. Durante el evento de surgencia más fuerte (mayo de 2007), las concentraciones de N2O disuelto fueron menores y no rebasaron los 12 nmol L–1. No fue posible definir el proceso de producción de N2O, y el afloramiento parece haber sido una forma eficiente de ventilación del N2O a la atmósfera. En general, las aguas superficiales estuvieron sobresaturadas en N2O con respecto a la atmósfera (saturación de 95 a 160%), lo que indica que el área de estudio estaba actuando como una fuente de N2O atmosférico. Vientos más fuertes y favorables a las surgencias, registrados en mayo de 2007 (de hasta 9 m s–1), contribuyeron al aumento de las emisiones de N2O, que alcanzaron valores de hasta 15.2 µmol m–2 d–1 en dicho periodo. En mayo de 2006 se estimaron los flujos más bajos de N2O a la atmósfera, que no superararon 8.8 µmol m–2 d–1. Teniendo en cuenta el flujo de N2O del área de estudio, se estima que la surgencia costera portuguesa cotribuye con una emisión de N2O entre 0.040 y 0.102 Gg N año–1. Estos valores son inferiores a los de la mayoría de los sistemas de surgencia, por lo que representan una fuente menor de N2O atmosférico.Iniversidad Autónoma de Baja California2011-04-26info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionPeer-reviewed Article Artículo Arbitradoapplication/pdfhttps://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/178710.7773/cm.v38i1B.1787Ciencias Marinas; Vol. 38 No. 1B (2012); 177-190Ciencias Marinas; Vol. 38 Núm. 1B (2012); 177-1902395-90530185-3880reponame:Ciencias Marinasinstname:UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIAinstacron:UABCenghttps://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1787/1664info:eu-repo/semantics/openAccessoai:cienciasmarinas.com.mx:article/17872024-08-22T17:01:40Z |
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