Importantly, while Absolute Salinity (g/kg) is the salinity variable that is needed in order to calculate density and other seawater properties, the salinity which should be archived in national data bases continues to be the measured salinity variable, Practical Salinity (PSS-78). Note that a pdf version of TEOS-10 Lecture Slides is located on the publications page. A detailed explanation of the TEOS-10 thermodynamic description of seawater can be found in the TEOS-10 Manual which has been published by IOC, SCOR and IAPSO.

The document What every oceanographer needs to know about TEOS-10 (the 'TEOS-Primer' for short) is a concise summary of the salient theoretical concepts which underpin TEOS-10, while Getting started with the GSW Oceanographic Toolbox of TEOS-10 guides the user through the steps required to process and publish physical oceanographic data using TEOS-10. Spatial variations of the composition of seawater mean that Absolute Salinity is not simply proportional to Practical Salinity TEOS-10 contains procedures to correct for these effects. The thermodynamic properties of seawater, such as density and enthalpy, are now correctly expressed as functions of Absolute Salinity rather than being functions of the conductivity of seawater. Ocean salinities now have units of g/kg.Ībsolute Salinity (g/kg) is an SI unit of concentration. TEOS-10 was adopted by the Intergovernmental Oceanographic Commission at its 25th Assembly in June 2009 to replace EOS-80 as the official description of seawater and ice properties in marine science.Ī significant change compared with past practice is that TEOS-10 uses Absolute Salinity S A (mass fraction of salt in seawater) as opposed to Practical Salinity S P (which is essentially a measure of the conductivity of seawater) to describe the salt content of seawater. TEOS-10 is based on a Gibbs function formulation from which all thermodynamic properties of seawater (density, enthalpy, entropy sound speed, etc.) can be derived in a thermodynamically consistent manner.

This site is the official source of information about the Thermodynamic Equation Of Seawater - 2010 (TEOS-10), and the way in which it should be used.

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