Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)

Tidal variation of CO2 system parameters was evaluated in the Tagus Estuary (SW Portugal) based on field observations performed in 2007 in the lower estuary under low river discharge conditions, during spring and autumn. Differences were found in the distribution patterns of environmental variables...

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Autores principales:	Oliveira, AP, Cabeçadas, G
Formato:	info:eu-repo/semantics/article
Lenguaje:	eng
Publicado:	Iniversidad Autónoma de Baja California 2011
Materias:	CO2 tidal variations biogeochemical processes estuaries Tagus Estuary variaciones mareales pprocesos biogeoquímicos estuarios estuario del Tajo
Acceso en línea:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1784
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id	repositorioinstitucional-20.500.12930-7436
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spelling	repositorioinstitucional-20.500.12930-74362023-05-09T14:30:32Z Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal) Procesos tras la variabilidad mareal del bióxido de carbono en elestuario del Tajo (Portugal) Oliveira, AP Cabeçadas, G CO2 tidal variations biogeochemical processes estuaries Tagus Estuary CO2 variaciones mareales pprocesos biogeoquímicos estuarios estuario del Tajo Tidal variation of CO2 system parameters was evaluated in the Tagus Estuary (SW Portugal) based on field observations performed in 2007 in the lower estuary under low river discharge conditions, during spring and autumn. Differences were found in the distribution patterns of environmental variables along a tidal cycle and at neap and spring tides essentially due to tide amplitude effects and tidal asymmetric behavior. A dominant east-westbound current was detected transporting CO2 enriched estuarine water offshore mainly during the ebb, and the reverse tidal current transporting more oxygenated marine water and with high chlorophyll a concentration during the flood. Distinct seasonal features were observed in terms of CO2 water properties and productivity. Regarding the tidal variability of the CO2 system parameters, besides the key processes controlling the variability, such as tidal advection and horizontal mixing of the two water masses present (estuarine and oceanic), specific biogeochemical processes emerged as playing an important role. Data obtained indicate that photosynthesis (in spring), aerobic respiration, and CaCO3 precipitation/dissolution (mainly in autumn) processes co-occur and control short-scale variations of CO2, reflecting the complexity of CO2 chemistry in the Tagus Estuary.  Se evaluó la variabilidad asociada a las mareas de los parámetros del sistema del CO2 en el estuario del Tajo (SO de Portugal) en base a observaciones de campo de 2007 en la parte baja del estuario en condiciones de poca descarga fluvial en la primavera y el otoño. Se encontraron diferencias en los patrones de distribución de las variables ambientales a lo largo del ciclo de mareas en las mareas muertas y las mareas vivas debidas esencialmente a los efectos de la amplitud y el comportamiento asimétrico de las mareas. Se detectó una corriente dominante de este a oeste que transporta mar adentro agua del estuario enriquecida en CO2 principalmente durante el reflujo y que se revierte en una corriente de marea de agua de mar más oxigenada y con alta concentración de clorofila a durante el flujo de la marea. Se observaron diferentes rasgos estacionales en términos de las propiedades del agua relacionadas con el CO2 y la productividad. Con relación a la variabilidad mareal de los parámetros del sistema del CO2, además de procesos claves que controlan la variabilidad como el transporte por las mareas y la mezcla de las dos masas de agua presentes (estuarina y oceánica), se ha visto que algunos procesos biogeoquímicos juegan también un papel muy importante en ésta. Los datos obtenidos indican que los procesos de fotosíntesis (en primavera), respiración aeróbica, y precipitación/disolución del CaCO3 (principalmente en otoño) concurren y controlan variaciones de corto plazo en el CO2, lo que refleja la complejidad de la química de este compuesto en el estuario del Tajo. 2011-02-04 2021-06-03T03:55:18Z 2021-06-03T03:55:18Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1784 10.7773/cm.v38i1B.1784 https://hdl.handle.net/20.500.12930/7436 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1784/1666 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 38 No. 1B (2012); 209-221 Ciencias Marinas; Vol. 38 Núm. 1B (2012); 209-221 2395-9053 0185-3880
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	CO2 tidal variations biogeochemical processes estuaries Tagus Estuary CO2 variaciones mareales pprocesos biogeoquímicos estuarios estuario del Tajo
spellingShingle	CO2 tidal variations biogeochemical processes estuaries Tagus Estuary CO2 variaciones mareales pprocesos biogeoquímicos estuarios estuario del Tajo Oliveira, AP Cabeçadas, G Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)
description	Tidal variation of CO2 system parameters was evaluated in the Tagus Estuary (SW Portugal) based on field observations performed in 2007 in the lower estuary under low river discharge conditions, during spring and autumn. Differences were found in the distribution patterns of environmental variables along a tidal cycle and at neap and spring tides essentially due to tide amplitude effects and tidal asymmetric behavior. A dominant east-westbound current was detected transporting CO2 enriched estuarine water offshore mainly during the ebb, and the reverse tidal current transporting more oxygenated marine water and with high chlorophyll a concentration during the flood. Distinct seasonal features were observed in terms of CO2 water properties and productivity. Regarding the tidal variability of the CO2 system parameters, besides the key processes controlling the variability, such as tidal advection and horizontal mixing of the two water masses present (estuarine and oceanic), specific biogeochemical processes emerged as playing an important role. Data obtained indicate that photosynthesis (in spring), aerobic respiration, and CaCO3 precipitation/dissolution (mainly in autumn) processes co-occur and control short-scale variations of CO2, reflecting the complexity of CO2 chemistry in the Tagus Estuary.
format	info:eu-repo/semantics/article
author	Oliveira, AP Cabeçadas, G
author_facet	Oliveira, AP Cabeçadas, G
author_sort	Oliveira, AP
title	Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)
title_short	Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)
title_full	Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)
title_fullStr	Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)
title_full_unstemmed	Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)
title_sort	processes underlying tidal variability of carbon dioxide in the tagus estuary (portugal)
publisher	Iniversidad Autónoma de Baja California
publishDate	2011
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1784
_version_	1792609120015089664

Processes underlying tidal variability of carbon dioxide in the Tagus Estuary (Portugal)

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