Underway pH measurements in upwelling conditions: The California Current

Underway pH measurements in upwelling conditions: The California Current

This paper reports the use of underway spectrophotometric pH as part of a series of measurements (together with underway salinity, temperature and some discrete measurements of chlorophyll a) made in the California Current coastal upwelling area. The values of pH obtained (measured at 25ºC) ranged f...

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Autor principal: Del-Valls, TA
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 1999
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719
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spelling oai:cienciasmarinas.com.mx:article-7192019-05-16T23:42:00Z Underway pH measurements in upwelling conditions: The California Current Medidas en continuo de pH en condiciones de afloramiento: La Corriente de California Del-Valls, TA spectrophotometric pH CO2 biogeochemical processes upwelling California Current pH espectrofotométrico CO2 procesos biogeoquímicos afloramiento Corriente de California This paper reports the use of underway spectrophotometric pH as part of a series of measurements (together with underway salinity, temperature and some discrete measurements of chlorophyll a) made in the California Current coastal upwelling area. The values of pH obtained (measured at 25ºC) ranged from 7.6 near the coastline (in the centre of the upwelling) to 8.3 at the western boundary of the study area (close to the oceanic environment); pH values were more uniform away from the influence of upwelling. Variations in the pH, temperature and chlorophyll a were all approximately in phase. In particular, higher pH values –indicative of photosynthetic activity– were well correlated with the chlorophyll a measurements. These results illustrate the need to consider both small and mesoscale processes when investigating carbon dioxide exchange across the air-sea interface in such systems, and also show that spectrophotometric pH measurements are sufficiently sensitive (and can be measured sufficiently rapidly) to describe various biogeochemical processes in such systems. Este trabajo muestra el uso de medidas espectrofotométricas de pH realizadas de forma continua y automatizadas como parte de una serie de medidas (conjuntamente en continuo, la salinidad, temperatura y algunos datos discretos de clorofila a) en el área de afloramiento de la Corriente de California. Los valores obtenidos de pH (medidos a 25ºC) oscilaron entre 7.6 cerca de la línea de costa (en el centro del afloramiento) y 8.3 en la frontera más oeste del área estudiada (cerca del ambiente oceánico); los valores de pH fueron más uniformes lejos de la zona de influencia del afloramiento. Las variaciones en pH, temperatura y clorofila a estuvieron aproximadamente en fase conjuntamente. En particular, los valores mayores de pH –indicativos de actividad fotosintética– mostraron buena correlación con las medidas de clorofila a. Estos resultados muestran la necesidad de considerar tanto los procesos a nivel de escala pequeña como a mesoescala cuando se estudia el intercambio de dióxido de carbono a través de la interfase aire-océano en sistemas como los estudiados, y también muestran a las medidas espectrofotométricas de pH como suficientemente sensibles (pudiéndose medir suficientemente rápido) para describir diferentes procesos biogeoquímicos en estos sistemas. Iniversidad Autónoma de Baja California 1999-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719 10.7773/cm.v25i3.719 Ciencias Marinas; Vol. 25 No. 3 (1999); 345-365 Ciencias Marinas; Vol. 25 Núm. 3 (1999); 345-365 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719/646
institution Ciencias Marinas
collection OJS
language eng
format Online
author Del-Valls, TA
spellingShingle Del-Valls, TA
Underway pH measurements in upwelling conditions: The California Current
author_facet Del-Valls, TA
author_sort Del-Valls, TA
title Underway pH measurements in upwelling conditions: The California Current
title_short Underway pH measurements in upwelling conditions: The California Current
title_full Underway pH measurements in upwelling conditions: The California Current
title_fullStr Underway pH measurements in upwelling conditions: The California Current
title_full_unstemmed Underway pH measurements in upwelling conditions: The California Current
title_sort underway ph measurements in upwelling conditions: the california current
description This paper reports the use of underway spectrophotometric pH as part of a series of measurements (together with underway salinity, temperature and some discrete measurements of chlorophyll a) made in the California Current coastal upwelling area. The values of pH obtained (measured at 25ºC) ranged from 7.6 near the coastline (in the centre of the upwelling) to 8.3 at the western boundary of the study area (close to the oceanic environment); pH values were more uniform away from the influence of upwelling. Variations in the pH, temperature and chlorophyll a were all approximately in phase. In particular, higher pH values –indicative of photosynthetic activity– were well correlated with the chlorophyll a measurements. These results illustrate the need to consider both small and mesoscale processes when investigating carbon dioxide exchange across the air-sea interface in such systems, and also show that spectrophotometric pH measurements are sufficiently sensitive (and can be measured sufficiently rapidly) to describe various biogeochemical processes in such systems.
publisher Iniversidad Autónoma de Baja California
publishDate 1999
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719
_version_ 1715724002479046656

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