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Seawater-pH measurements for ocean-acidification observations

Seawater-pH measurements for ocean-acidification observations
Seawater-pH measurements for ocean-acidification observations
The uptake of anthropogenic CO2 by the oceans since the onset of the industrial revolution is considered a serious challenge to marine ecosystems due to ensuing carbonate-chemistry changes (ocean acidification). Furthermore, the CO2 uptake is reducing the ocean’s capacity to absorb future CO2 emissions. In order to follow the changes in the ocean’s carbonate system, high-quality analytical measurements with good spatial and temporal resolution are necessary. High-precision and accurate pH measurements are now possible, and allow us to determine the progression of ocean acidification. The spectrophotometric pH technique is now widely used and capable of the required high-quality measurements. Spectrophotometric pH systems are deployed on ships and in situ on remote platforms. Smaller and more rugged instruments are nevertheless required for more widespread in situ application to allow routine high-resolution measurements, even in the most remote regions.

We critically review oceanic pH measurements, and focus on state-of-the-art spectrophotometric pH measurement techniques and instrumentation. We present a simple microfluidic design integrated in a shipboard instrument featuring high accuracy and precision as a key step towards a targeted pH microsensor system.
Carbonate system, Colorimetry, Microfluidic pH sensor, Ocean acidification, Oceanic pH, pH microsensor system, Seawater, Sensor, Spectrophotometric pH, Spectrophotometry
0165-9936
146-157
Rérolle, Victoire M.C.
454aa1fc-b776-4df7-a763-721155a7be40
Floquet, Cedric F.A.
9e0adc5e-10f1-4d67-81cc-63157949b704
Mowlem, Matt C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Bellerby, Richard R.G.J.
ce2ed8d6-fe0c-443f-af66-a7db52c02838
Rérolle, Victoire M.C.
454aa1fc-b776-4df7-a763-721155a7be40
Floquet, Cedric F.A.
9e0adc5e-10f1-4d67-81cc-63157949b704
Mowlem, Matt C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Bellerby, Richard R.G.J.
ce2ed8d6-fe0c-443f-af66-a7db52c02838

Rérolle, Victoire M.C., Floquet, Cedric F.A., Mowlem, Matt C., Connelly, Douglas P., Achterberg, Eric P. and Bellerby, Richard R.G.J. (2012) Seawater-pH measurements for ocean-acidification observations. Trends in Analytical Chemistry, 40, 146-157. (doi:10.1016/j.trac.2012.07.016).

Record type: Article

Abstract

The uptake of anthropogenic CO2 by the oceans since the onset of the industrial revolution is considered a serious challenge to marine ecosystems due to ensuing carbonate-chemistry changes (ocean acidification). Furthermore, the CO2 uptake is reducing the ocean’s capacity to absorb future CO2 emissions. In order to follow the changes in the ocean’s carbonate system, high-quality analytical measurements with good spatial and temporal resolution are necessary. High-precision and accurate pH measurements are now possible, and allow us to determine the progression of ocean acidification. The spectrophotometric pH technique is now widely used and capable of the required high-quality measurements. Spectrophotometric pH systems are deployed on ships and in situ on remote platforms. Smaller and more rugged instruments are nevertheless required for more widespread in situ application to allow routine high-resolution measurements, even in the most remote regions.

We critically review oceanic pH measurements, and focus on state-of-the-art spectrophotometric pH measurement techniques and instrumentation. We present a simple microfluidic design integrated in a shipboard instrument featuring high accuracy and precision as a key step towards a targeted pH microsensor system.

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More information

Published date: 2012
Keywords: Carbonate system, Colorimetry, Microfluidic pH sensor, Ocean acidification, Oceanic pH, pH microsensor system, Seawater, Sensor, Spectrophotometric pH, Spectrophotometry
Organisations: Ocean Biochemistry & Ecosystems, Marine Geoscience, Ocean Technology and Engineering

Identifiers

Local EPrints ID: 346720
URI: http://eprints.soton.ac.uk/id/eprint/346720
ISSN: 0165-9936
PURE UUID: fd415253-c3b8-4d54-b47c-262fa7e41b26
ORCID for Matt C. Mowlem: ORCID iD orcid.org/0000-0001-7613-6121

Catalogue record

Date deposited: 08 Jan 2013 10:07
Last modified: 15 Mar 2024 03:02

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Contributors

Author: Victoire M.C. Rérolle
Author: Cedric F.A. Floquet
Author: Matt C. Mowlem ORCID iD
Author: Douglas P. Connelly
Author: Richard R.G.J. Bellerby

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