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Articles | Volume 19, issue 6
Articles | Volume 19, issue 6
https://doi.org/10.5194/os-19-1719-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-19-1719-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 6
Research article
 | 
05 Dec 2023
Research article |  | 05 Dec 2023

A thermodynamic potential of seawater in terms of Absolute Salinity, Conservative Temperature, and in situ pressure

Trevor J. McDougall, Paul M. Barker, Rainer Feistel, and Fabien Roquet

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Cited articles

Callen, H. B.: Thermodynamics and an Introduction to Thermostatics, John Wiley and Sons, New York, 493 pp., 1985. 
Clausius, R.: Die mechanische Wärmetheorie, Vieweg, Braunschweig, 1876. 
de Groot, S. R. and Mazur P.: Non-Equilibrium Thermodynamics, North-Holland Pub. Co., Amsterdam, Friedrich Vieweg und Sohn, ISBN 0-486-64741-2, 1984. 
Feistel, R.: A new extended Gibbs thermodynamic potential of seawater, Progr. Oceanogr., 58, 43–114, 2003. 
Feistel, R.: A Gibbs function for seawater thermodynamics for −6 to 80 ∘C and salinity up to 120 g kg−1, Deep-Sea Res. Pt. I, 55, 1639–1671, 2008. 
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A thermodynamic potential is derived, with the temperature argument being Conservative Temperature. All thermodynamic quantities can be derived from this new thermodynamic potential function, and it enables the accurate (to computer machine precision) calculation of the in situ temperature and entropy of seawater. This new thermodynamic potential function adds fundamental thermodynamic justification to the adoption of Conservative Temperature in oceanography in 2010.
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