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...
| Author: | |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 1999 |
| Country: | México |
| Institution: | UABC |
| Repository: | Ciencias Marinas |
| Language: | English |
| OAI Identifier: | oai:cienciasmarinas.com.mx:article/719 |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719 |
| Access Level: | Open access |
| Keyword: | spectrophotometric pH CO2 biogeochemical processes upwelling California Current pH espectrofotométrico procesos biogeoquímicos afloramiento Corriente de California |
| _version_ | 1878409169974853632 |
|---|---|
| author | Del-Valls, TA |
| author_browse | Del-Valls, TA |
| author_facet | Del-Valls, TA |
| author_role | author |
| collection | Ciencias Marinas |
| 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | MX_9d00a5f7ba68c3eb00bc2a562de2e45b |
| identifier_str_mv | 10.7773/cm.v25i3.719 |
| institution | UABC |
| instname_str | UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIA |
| language | eng |
| network_acronym_str | MX |
| network_name_str | México |
| oai_identifier_str | oai:cienciasmarinas.com.mx:article/719 |
| publishDate | 1999 |
| publishDateSort | 1999 |
| publisher | Iniversidad Autónoma de Baja California |
| publisherStr | Iniversidad Autónoma de Baja California |
| reponame_str | Ciencias Marinas |
| spelling | 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 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 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719 10.7773/cm.v25i3.719 |
| spellingShingle | Underway pH measurements in upwelling conditions: The California Current Del-Valls, TA spectrophotometric pH CO2 biogeochemical processes upwelling California Current pH espectrofotométrico procesos biogeoquímicos afloramiento Corriente de California |
| status_str | publishedVersion |
| title | 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_short | Underway pH measurements in upwelling conditions: The California Current |
| title_sort | Underway pH measurements in upwelling conditions: The California Current |
| topic | spectrophotometric pH CO2 biogeochemical processes upwelling California Current pH espectrofotométrico procesos biogeoquímicos afloramiento Corriente de California |
| topic_facet | spectrophotometric pH CO2 biogeochemical processes upwelling California Current pH espectrofotométrico procesos biogeoquímicos afloramiento Corriente de California |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/719 |