The International thermodynamic equation of ... - unesdoc - Unesco

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The authors are responsible for the choice and the presentation of the facts contained in this publication and for the opinionsexpressed therein, which are not necessarily those of UNESCO, SCOR or IAPSO and do not commit those Organizations.For bibliographic purposes, this document should be cited as follows:The International Thermodynamic Equation of Seawater – 2010: A Summary for Policy Makers. IOC, SCOR and IAPSO, 2011(IOC. Brochures Series)TEOS-10 is published in the IOC Manuals and Guides Series:IOC, SCOR and IAPSO, 2010: The International Thermodynamic Equation of Seawater – 2010: Calculation and useof thermodynamic properties. (Manuals and Guides, 56.) (English), 196 pp. (IOC/2010/MG/56)Designer: Eric Loddé(IOC/BRO/2010/7)Printed in France© UNESCO/IOC et al. 2011
.75179 γTEOS-10: A new way to look at waterSeawater composition is a critical factor, along with temperature and pressure, in determiningthe density of the ocean and calculating its potential to contain and disperse energy. Howthese variables relate to each other is the basis for the new Thermodynamic Equation ofSeawater – 2010 (referred to as TEOS-10).The Intergovernmental Oceanographic Commission (IOC) of the United Nations Educational,Scientific, and Cultural Organization (UNESCO), the Scientific Committee on Oceanic Research(SCOR), the International Association for the Physical Sciences of the Oceans (IAPSO), andthe International Association for the Properties of Water and Steam (IAPWS) have all endorsedthe new thermodynamic approach, TEOS-10.This new method of analyzing seawater provides mutually consistent expressions for density,potential temperature, entropy, enthalpy, sound speed, chemical potential, as well as otherseawater properties — and provides an update to the Equation of State of Seawater, whichUNESCO endorsed in 1980 (referred to as EOS-80). Unlike the previous equation, however,the thermodynamic approach is also applicable to freshwater, ice, and water vapor.1
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