Articles | Volume 15, issue 13
https://doi.org/10.5194/bg-15-4291-2018
https://doi.org/10.5194/bg-15-4291-2018
Technical note
 | 
16 Jul 2018
Technical note |  | 16 Jul 2018

Technical note: Continuous fluorescence-based monitoring of seawater pH in situ

John W. Runcie, Christian Krause, Sergio A. Torres Gabarda, and Maria Byrne

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Cited articles

Caldwell, P. C., Merrfield, M. A., and Thompson, P. R.: Sea level measured by tide gauges from global oceans – the Joint Archive for Sea Level holdings (NCEI Accession 0019568), Version 5.5, NOAA National Centers for Environmental Information, Dataset, https://doi.org/10.7289/V5V40S7W, 2015. 
Dickson, A. G.: The carbon dioxide system in seawater: equilibrium chemistry and measurements, in Guide to best practises for ocean acidification research and data reporting, edited by: Riebesell, V. J., Fabry, V. J., Hansson, L., and Gattuso, J.-P., Publications Office of the European Union, Luxembourg, 17–40, 2010. 
Dickson, A. G. and Millero, F. J.: A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media, Deep-Sea Res., 34, 1733–1743, https://doi.org/10.1016/0198-0149(87)90021-5, 1987. 
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Douglas, N. K. and Byrne, R. H.: Achieving accurate spectrophotometric pH measurements using unpurified meta-cresol purple, Mar. Chem., 190, 66–72, https://doi.org/10.1016/j.marchem.2017.02.004, 2017a. 
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Short summary
pH in coastal waters can be highly variable. A means to measure this variation is needed. A fully autonomous submersible fluorescence-based pH monitoring device incorporating additional sensors for temperature and salinity was deployed in or adjacent to a shallow estuary for week-long intervals. Results and calculated aragonite/calcite saturation values are presented. The device is well suited to continuous flow-through or stand-alone measurements with a precision of at least 0.007 pH units.
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