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New equation of state of seawater
Date:2/5/2009

r seawater from which all the thermophysical properties of seawater can be derived in a physically consistent manner.

"The Gibbs function is a function of Absolute Salinity, temperature and pressure, which is a major departure from present practice (EOS-80). The reason for preferring Absolute Salinity over Practical Salinity is because the thermodynamic properties of seawater are directly influenced by the mass of dissolved constituents, or Absolute Salinity, whereas Practical Salinity depends of conductivity," said Millero. "If the new approach to defining the thermodynamic properties of seawater is well received by the scientific community, we would hope that TEOS-10 will become the new internationally accepted definition of seawater by 2010."

While Practical Salinity will still be the salinity variable that is stored in national databases (much as in situ temperature is stored in these databases), it is the new Absolute Salinity that will be used in journal publications, numerical ocean models and inverse models (as temperature is not used now, but rather, potential temperature for these purposes). The main reason for adopting the new salinity variable is to allow for the spatial differences in seawater composition; this variable composition affects conductivity differently to how it affects factors such as density, enthalpy, entropy and more.


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Contact: Barbra Gonzalez
barbgo@rsmas.miami.edu
305-421-4704
University of Miami Rosenstiel School of Marine & Atmospheric Science
Source:Eurekalert  

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