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

Developments in marine pCO2 measurement technology: towards sustained in situ observations
Developments in marine pCO2 measurement technology: towards sustained in situ observations
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.
0165-9936
53-61
Clarke, Jennifer S.
b52af005-821a-4b39-93b7-c0b66ce9d66c
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Schuster, Ute
3ba01afd-9a84-46e5-ae83-2e3ae708250f
Mowlem, Matthew
6f633ca2-298f-48ee-a025-ce52dd62124f
Clarke, Jennifer S.
b52af005-821a-4b39-93b7-c0b66ce9d66c
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Schuster, Ute
3ba01afd-9a84-46e5-ae83-2e3ae708250f
Mowlem, Matthew
6f633ca2-298f-48ee-a025-ce52dd62124f

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. Trends in Analytical Chemistry, 88, 53-61. (doi:10.1016/j.trac.2016.12.008).

Record type: Article

Abstract

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.

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Accepted/In Press date: 28 December 2016
Published date: 1 March 2017

Identifiers

Local EPrints ID: 413497
URI: https://eprints.soton.ac.uk/id/eprint/413497
ISSN: 0165-9936
PURE UUID: 14caa70a-fc50-44f1-9e67-e913cd236cfa

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Date deposited: 25 Aug 2017 16:31
Last modified: 02 Dec 2019 18:53

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