Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)

Abstract Ten field cruises were carried out in Tagus estuary from 1999 to 2007 to study the dynamics of the inorganic carbon system. Dissolved inorganic carbon (DIC) and total alkalinity (TA) increased with salinity. DIC and TA were generally conservative in the estuarine mixing zone (salinity > ...

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Autores principales:	A. P. Oliveira, G. Cabeçadas, M. D. Mateus
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4dee4b26abef488289fc8ff7c7f40605
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spelling	oai:doaj.org-article:4dee4b26abef488289fc8ff7c7f406052021-12-02T12:32:28ZInorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)10.1038/s41598-017-06758-z2045-2322https://doaj.org/article/4dee4b26abef488289fc8ff7c7f406052017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06758-zhttps://doaj.org/toc/2045-2322Abstract Ten field cruises were carried out in Tagus estuary from 1999 to 2007 to study the dynamics of the inorganic carbon system. Dissolved inorganic carbon (DIC) and total alkalinity (TA) increased with salinity. DIC and TA were generally conservative in the estuarine mixing zone (salinity > 10), while a complex distribution pattern was observed at the upper estuary. DIC values peaked 1786.9 ± 155.8 µmol kg−1 at that segment. Estimated annual mean fluxes of DIC were 0.27 Tg C yr−1 from the river to the estuary, and 0.37 Tg C yr−1 from here to the coastal area. The Tagus estuary was always CO2 supersaturated, with partial pressure of CO2 (pCO2) reaching 9160 µatm in the upper estuary. An average emission of 0.11 Tg C yr−1 was estimated from the estuary to the atmosphere, corresponding to 23% of exported DIC. Only 8% of the riverine DIC was ventilated. The non-conservative behaviour of CO2 parameters in the estuary segment under freshwater influence was attributed to alternations in the relevance of riverine/terrestrial runoff, photosynthesis, aerobic respiration, organic matter mineralization and CaCO3 precipitation/dissolution.A. P. OliveiraG. CabeçadasM. D. MateusNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. P. Oliveira G. Cabeçadas M. D. Mateus Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)
description	Abstract Ten field cruises were carried out in Tagus estuary from 1999 to 2007 to study the dynamics of the inorganic carbon system. Dissolved inorganic carbon (DIC) and total alkalinity (TA) increased with salinity. DIC and TA were generally conservative in the estuarine mixing zone (salinity > 10), while a complex distribution pattern was observed at the upper estuary. DIC values peaked 1786.9 ± 155.8 µmol kg−1 at that segment. Estimated annual mean fluxes of DIC were 0.27 Tg C yr−1 from the river to the estuary, and 0.37 Tg C yr−1 from here to the coastal area. The Tagus estuary was always CO2 supersaturated, with partial pressure of CO2 (pCO2) reaching 9160 µatm in the upper estuary. An average emission of 0.11 Tg C yr−1 was estimated from the estuary to the atmosphere, corresponding to 23% of exported DIC. Only 8% of the riverine DIC was ventilated. The non-conservative behaviour of CO2 parameters in the estuary segment under freshwater influence was attributed to alternations in the relevance of riverine/terrestrial runoff, photosynthesis, aerobic respiration, organic matter mineralization and CaCO3 precipitation/dissolution.
format	article
author	A. P. Oliveira G. Cabeçadas M. D. Mateus
author_facet	A. P. Oliveira G. Cabeçadas M. D. Mateus
author_sort	A. P. Oliveira
title	Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)
title_short	Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)
title_full	Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)
title_fullStr	Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)
title_full_unstemmed	Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)
title_sort	inorganic carbon distribution and co2 fluxes in a large european estuary (tagus, portugal)
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4dee4b26abef488289fc8ff7c7f40605
work_keys_str_mv	AT apoliveira inorganiccarbondistributionandco2fluxesinalargeeuropeanestuarytagusportugal AT gcabecadas inorganiccarbondistributionandco2fluxesinalargeeuropeanestuarytagusportugal AT mdmateus inorganiccarbondistributionandco2fluxesinalargeeuropeanestuarytagusportugal
_version_	1718394034022514688

Inorganic carbon distribution and CO2 fluxes in a large European estuary (Tagus, Portugal)

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