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OS | Articles | Volume 16, issue 4
Ocean Sci., 16, 847–862, 2020
https://doi.org/10.5194/os-16-847-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Ocean Sci., 16, 847–862, 2020
https://doi.org/10.5194/os-16-847-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 Jul 2020

Research article | 21 Jul 2020

Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions

Olivier Sulpis et al.

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Cited articles

Bailey, N., Papakyriakou, T. N., Bartels, C., and Feiyue, W.: Henry's Law constant for CO2 in aqueous sodium chloride solutions at 1 atm and sub-zero (Celsius) temperatures, Mar. Chem., 207, 26–32, https://doi.org/10.1016/j.marchem.2018.10.003, 2018. 
Bates, N. R.: Ocean Carbon Cycle, in: Encyclopedia of Ocean Sciences, 3rd edn., edited by: Cochran, J. K., Bokuniewicz, H. J., and Yager, P. L., Elsevier, 1, 418–428, 2019. 
Brown, K. A., Miller, L. A., Davelaar, M., Francois, R., and Tortell, P. D.: Over-determination of the carbonate system in natural sea-ice brine and assessment of carbonic acid dissociation constants under low temperature, high salinity conditions, Mar. Chem., 165, 36–45, https://doi.org/10.1016/j.marchem.2014.07.005, 2014. 
Byrne, R. H. and Yao, W.: Procedures for measurement of carbonate ion concentrations in seawater by direct spectrophotometric observations of Pb(II) complexation, Mar. Chem., 112, 128–135, 2008. 
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As direct measurements of seawater carbonate system variables, such as pH, are difficult to obtain, scientists use equilibrium constants to compute them from known variables. Using a compilation of in situ data, we show that the set of equilibrium constants preferred by the community is not consistent with measurements in cold, polar waters, where human-made ocean acidification is spreading rapidly. Closing knowledge gaps regarding seawater carbon chemistry in polar regions should be a priority.
As direct measurements of seawater carbonate system variables, such as pH, are difficult to...
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