Developments in marine pCO2 measurement technology; towards sustained in situ observations

Clarke, Jennifer S., Achterberg, Eric P., Connelly, Douglas P., Schuster, Ute and Mowlem, Matthew (2017) Developments in marine pCO2 measurement technology; towards sustained in situ observations TrAC - Trends in Analytical Chemistry, 88 . pp. 53-61. DOI 10.1016/j.trac.2016.12.008.

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Supplementary data:



• Evaluation of currently available marine pCO2 sensors with respect to in situ deployment potential.
• In depth review of novel optode technology for pCO2.
• A pCO2 optode was calibrated using modified time-domain dual lifetime referencing, over the range 280–480 μatm, with a precision of 0.8 μatm.


The oceanic uptake of anthropogenic CO2 causes pronounced changes to the marine carbonate system. High quality pCO2 measurements with good temporal and spatial coverage are required to monitor the oceanic uptake, identify regions with pronounced carbonate system changes, and observe the effectiveness of CO2 emission mitigation strategies. There are currently several instruments available, but many are unsuitable for autonomous deployments on in situ platforms such as gliders, moorings and Argo floats. We assess currently available technology on its suitability for in situ deployment, with a focus on optode technology developments.

Optodes for pCO2 measurements provide a promising new technological approach, and were successfully calibrated over the range of 280–480 μatm applying modified time-domain dual lifetime referencing. A laboratory precision of 0.8 μatm (n = 10) and a response time (τ90) of 165 s were achieved, and with further development pCO2 optodes may become as widely used as their oxygen counterparts.

Document Type: Article
Keywords: pCO2; Sensors; Seawater; In situ observations; Optodes
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.trac.2016.12.008
ISSN: 0165-9936
Projects: Future Ocean
Date Deposited: 17 Jan 2017 07:36
Last Modified: 19 Dec 2017 12:42

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