CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)

CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)

 Variations of the partial pressure of CO2 (pCO2) and related parameters were determined in surface seawater adjacent to the Tagus Estuary during May 2000 (spring) and March 2001 (winter). The pCO2 values of 730 and 1450 µatm estimated in spring and winter, respectively, are of the same ord...

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Main Authors: Oliveira, AP, Nogieira, M, Cabeçadas, G
Format: info:eu-repo/semantics/article
Language:eng
Published: Iniversidad Autónoma de Baja California 2006
Subjects:
CO2 air-sea fluxes
partial pressure of CO2
physical-biological control
Tagus Estuary
coastal seas
flujos océano-atmósfera de CO2
presión parcial de CO2
control físico-biólogico
estuario del Tajo
aguas costeras
Online Access:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1088
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spelling repositorioinstitucional-20.500.12930-74142023-05-09T14:30:23Z CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal) Variabilidad de CO2 en aguas costeras superficiales adyacentes al estuario del Tajo (Portugal) Oliveira, AP Nogieira, M Cabeçadas, G CO2 air-sea fluxes partial pressure of CO2 physical-biological control Tagus Estuary coastal seas flujos océano-atmósfera de CO2 presión parcial de CO2 control físico-biólogico estuario del Tajo aguas costeras  Variations of the partial pressure of CO2 (pCO2) and related parameters were determined in surface seawater adjacent to the Tagus Estuary during May 2000 (spring) and March 2001 (winter). The pCO2 values of 730 and 1450 µatm estimated in spring and winter, respectively, are of the same order of magnitude as those of other European coastal areas. The extremely high Tagus River discharge (1820 m3 s–1) that occurred in winter created a pronounced estuarine plume reflected in decreased surface salinity and elevated supersaturation of CO2 with respect to the atmosphere (~400%). The pCO2 distribution was mainly governed by enhanced CO2 solubility at low temperatures and by the hydrodynamics. In contrast, in spring, when the discharge was much lower (190 m3 s–1), the distribution of pCO2 depended on phytoplankton productivity. In fact, CO2 was close to equilibrium with the atmosphere and controlled by biological processes. The estimated CO2 fluxes for the entire study area reached mean values of 1 and 55 mmol CO2 m–2 d–1 in spring and winter, respectively. The CO2 emissions during the productive period exhibited negligible values due to the reduction of pCO2 in surface waters. This study reveals that the coastal area off the Tagus Estuary functions as a likely source of CO2 to the atmosphere during some periods of the year. Se determinaron las variaciones de la presión parcial de CO2 (pCO2) y los parámetros relacionados en las aguas costeras superficiales adyacentes al estuario del Tajo durante mayo de 2000 (primavera) y marzo de 2001 (invierno). Los valores de pCO2 de 730 y 1450 µatm estimados para primavera e invierno, respectivamente, son del mismo orden de magnitud que los de otras zonas costeras europeas. Durante el invierno, la extremadamente alta descarga del Río Tajo (1820 m3 s–1) generó una pluma estuarina pronunciada que se reflejó en la reducción de la salinidad superficial y la supersaturación de CO2 con respecto a la atmósfera (~400%). La distribución de pCO2 estuvo determinada principalmente por el incremento en la solubilidad del CO2 a bajas temperaturas y la hidrodinámica local. En contraste, en primavera, cuando la descarga fue mucho menor (190 m3 s–1), la distribución de pCO2 dependió de la productividad fitoplanctónica. De hecho, el CO2 estuvo cerca del equilibrio con la atmósfera y controlado por procesos biológicos. Los flujos de CO2 estimados para toda el área de estudio alcanzaron valores medios de 1 y 55 mmol CO2 m–2 d–1 en primavera e invierno, respectivamente. Las emisiones de CO2 durante el periodo productivo mostraron valores despreciables debido a la reducción de pCO2 en aguas superficiales. Este estudio mostró que la zona costera adyacente al estuario del Tajo probablemente funciona como una fuente de CO2 a la atmósfera durante algunos periodos del año. 2006-08-17 2021-06-03T03:55:15Z 2021-06-03T03:55:15Z 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/1088 10.7773/cm.v32i22.1088 https://hdl.handle.net/20.500.12930/7414 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1088/1921 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 32 No. 2B (2006); 401-411 Ciencias Marinas; Vol. 32 Núm. 2B (2006); 401-411 2395-9053 0185-3880
institution Repositorio Institucional
collection DSpace
language eng
topic CO2 air-sea fluxes
partial pressure of CO2
physical-biological control
Tagus Estuary
coastal seas
flujos océano-atmósfera de CO2
presión parcial de CO2
control físico-biólogico
estuario del Tajo
aguas costeras
spellingShingle CO2 air-sea fluxes
partial pressure of CO2
physical-biological control
Tagus Estuary
coastal seas
flujos océano-atmósfera de CO2
presión parcial de CO2
control físico-biólogico
estuario del Tajo
aguas costeras
Oliveira, AP
Nogieira, M
Cabeçadas, G
CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)
description  Variations of the partial pressure of CO2 (pCO2) and related parameters were determined in surface seawater adjacent to the Tagus Estuary during May 2000 (spring) and March 2001 (winter). The pCO2 values of 730 and 1450 µatm estimated in spring and winter, respectively, are of the same order of magnitude as those of other European coastal areas. The extremely high Tagus River discharge (1820 m3 s–1) that occurred in winter created a pronounced estuarine plume reflected in decreased surface salinity and elevated supersaturation of CO2 with respect to the atmosphere (~400%). The pCO2 distribution was mainly governed by enhanced CO2 solubility at low temperatures and by the hydrodynamics. In contrast, in spring, when the discharge was much lower (190 m3 s–1), the distribution of pCO2 depended on phytoplankton productivity. In fact, CO2 was close to equilibrium with the atmosphere and controlled by biological processes. The estimated CO2 fluxes for the entire study area reached mean values of 1 and 55 mmol CO2 m–2 d–1 in spring and winter, respectively. The CO2 emissions during the productive period exhibited negligible values due to the reduction of pCO2 in surface waters. This study reveals that the coastal area off the Tagus Estuary functions as a likely source of CO2 to the atmosphere during some periods of the year.
format info:eu-repo/semantics/article
author Oliveira, AP
Nogieira, M
Cabeçadas, G
author_facet Oliveira, AP
Nogieira, M
Cabeçadas, G
author_sort Oliveira, AP
title CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)
title_short CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)
title_full CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)
title_fullStr CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)
title_full_unstemmed CO2 variability in surface coastal waters adjacent to the Tagus Estuary (Portugal)
title_sort co2 variability in surface coastal waters adjacent to the tagus estuary (portugal)
publisher Iniversidad Autónoma de Baja California
publishDate 2006
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1088
_version_ 1792608727047602176

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