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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)
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
0886-6236
895-897
Zeebe, Richard E.
a94a934c-a71d-465c-99f0-83067df5e50b
Tyrrell, Toby
6808411d-c9cf-47a3-88b6-c7c294f2d114
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, 895-897. (doi:10.1002/2017GB005786).

Record type: Letter

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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More information

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
ORCID for Toby Tyrrell: ORCID iD orcid.org/0000-0002-1002-1716

Catalogue record

Date deposited: 23 Jul 2018 16:30
Last modified: 07 Oct 2020 01:39

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