Comment on "The Effects of Secular Calcium and Magnesium Concentration Changes on the Thermodynamics of Seawater Acid/Base Chemistry: Implications for Eocene and Cretaceous Ocean Carbon Chemistry and Buffering" by Hain et al. (2015)
Comment on "The Effects of Secular Calcium and Magnesium Concentration Changes on the Thermodynamics of Seawater Acid/Base Chemistry: Implications for Eocene and Cretaceous Ocean Carbon Chemistry and Buffering" by Hain et al. (2015)
Hain et al. (2015, https//doi.org/10.1002/2014GB004986, hereafter H15) calculated effects of changing [Ca2+] and [Mg2+] on the equilibrium constants of the CO2-CaCO3 system in seawater based on a Pitzer ionic interaction model. We show here that critical results presented in H15 are fundamentally wrong. We therefore do not recommend using H15's stoichiometric equilibrium constants to correct for past changes in major-ion seawater composition.
Calcium, Carbonic acid constants, CO system, Magnesium, Reconstructions, Seawater
895-897
Zeebe, Richard E.
a94a934c-a71d-465c-99f0-83067df5e50b
Tyrrell, Toby
6808411d-c9cf-47a3-88b6-c7c294f2d114
May 2018
Zeebe, Richard E.
a94a934c-a71d-465c-99f0-83067df5e50b
Tyrrell, Toby
6808411d-c9cf-47a3-88b6-c7c294f2d114
Zeebe, Richard E. and Tyrrell, Toby
(2018)
Comment on "The Effects of Secular Calcium and Magnesium Concentration Changes on the Thermodynamics of Seawater Acid/Base Chemistry: Implications for Eocene and Cretaceous Ocean Carbon Chemistry and Buffering" by Hain et al. (2015).
Global Biogeochemical Cycles, .
(doi:10.1002/2017GB005786).
Abstract
Hain et al. (2015, https//doi.org/10.1002/2014GB004986, hereafter H15) calculated effects of changing [Ca2+] and [Mg2+] on the equilibrium constants of the CO2-CaCO3 system in seawater based on a Pitzer ionic interaction model. We show here that critical results presented in H15 are fundamentally wrong. We therefore do not recommend using H15's stoichiometric equilibrium constants to correct for past changes in major-ion seawater composition.
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Accepted/In Press date: 22 March 2018
e-pub ahead of print date: 6 April 2018
Published date: May 2018
Keywords:
Calcium, Carbonic acid constants, CO system, Magnesium, Reconstructions, Seawater
Identifiers
Local EPrints ID: 422411
URI: http://eprints.soton.ac.uk/id/eprint/422411
ISSN: 0886-6236
PURE UUID: 1d5c9ae6-a749-48ff-8413-2767b60263e9
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Date deposited: 23 Jul 2018 16:30
Last modified: 16 Mar 2024 02:52
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Author:
Richard E. Zeebe
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