Underway pH measurements in upwelling conditions: The California Current

TA Del-Valls

doi:10.7773/cm.v25i3.719

PDF

Published: Mar 6, 1999

DOI: https://doi.org/10.7773/cm.v25i3.719

Keywords:

spectrophotometric pH, CO2, biogeochemical processes, upwelling, California Current

TA Del-Valls

Universidad de Cádiz

Abstract

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.

Downloads

Download data is not yet available.

How to Cite

Del-Valls, T. (1999). Underway pH measurements in upwelling conditions: The California Current. Ciencias Marinas, 25(3), 345–365. https://doi.org/10.7773/cm.v25i3.719

Issue

Vol. 25 No. 3 (1999)

Section

Research Article

This is an open access article distributed under a Creative Commons Attribution 4.0 License, which allows you to share and adapt the work, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Figures, tables and other elements in the article are included in the article’s CC BY 4.0 license, unless otherwise indicated. The journal title is protected by copyrights and not subject to this license. Full license deed can be viewed here.

Metrics

Most read articles by the same author(s)

TA Del-Valls, V Sáenz, AM Arias, J Biasco, Thallium in the marine environment: First ecotoxicological assessments in the Guadalquivir estuary and its potential adverse effect on the Doñana European natural reserve after the Aznalcóllar mining spill (SW Spain) , Ciencias Marinas: Vol. 25 No. 2 (1999)
TA Del-Valls, JM Forja, A Gomez-Parra, The use of multivariate analysis to link sediment contamination and toxicity data to establish sediment quality guidelines an example in the Gulf of Cadiz (Spain) , Ciencias Marinas: Vol. 24 No. 2 (1998)
ML Martín-Díaz, SR Tuberty, CL McKenney-Jr, D Sales, TA Del-Valls, Effects of cadmium and zinc on Procambarus clarkii: Simulation of the Aznalcóllar mining spill , Ciencias Marinas: Vol. 31 No. 1B (2005)
E García-Luque, I Sáenz, I Riba, TA Del-Valls, JM Forja, A Gómez-Parra, Heavy metals at the Guadalquivir estuary , Ciencias Marinas: Vol. 29 No. 4 (2003)
N Fernández, A Cesar, M González, TA Del-Valls, Level of contamination in sediments affected by the Prestige oil spill and impact on the embryo development of the sea urchin , Ciencias Marinas: Vol. 32 No. 2B (2006)
JM Forja, T Ortega, TA del-Valls, A Gómez-Parra, Influence of benthic regeneration on the biogeochemical cycle of CO2 in littoral ecosystems , Ciencias Marinas: Vol. 27 No. 3 (2001)
Mc Casado-Martínez, T Campisi, A Díaz, R Lo-Re, R Obispo, JF Postma, I Riba, AC Sneekes, JL Buceta, TA del-Valls, Interlaboratory assessment of marine bioassays to evaluate the environmental quality of coastal sediments in Spain. II. Bioluminescence inhibition test for rapid sediment toxicity assessment , Ciencias Marinas: Vol. 32 No. 1B (2006)
MC Casado-Martínez, R Beiras, MJ Belzunce, MA González-Castromil, M Guirao, JF Postma, I Riba, TA del-Valls, Interlaboratory assessment of marine bioassays to evaluate the environmental quality of coastal sediments in Spain. IV. Whole sediment toxicity test using crustacean amphipods , Ciencias Marinas: Vol. 32 No. 1B (2006)
MC Casado-Martínez, JL Buceta, JM Forja, TA del-Valls, Interlaboratory assessment of marine bioassays to evaluate the environmental quality of coastal sediments in Spain. VI. General analysis of results and conclusions of the exercise , Ciencias Marinas: Vol. 32 No. 1B (2006)
MC Casado-Martínez, JL Buceta, JM Forja, TA del-Valls, Interlaboratory assessment of marine bioassays to evaluate the environmental quality of coastal sediments in Spain. I. Exercise description and sediment quality , Ciencias Marinas: Vol. 32 No. 1B (2006)

1 2 > >>

Article Sidebar

Main Article Content

Abstract

Downloads

Article Details

Metrics

Most read articles by the same author(s)