Algorithms for density, potential temperature, Conservative Temperature and freezing temperature of seawater
This page contains oceanographic software relating to Jackett et al. (2006) here after refered to as JMFWG-06.
Jackett, David R., Trevor J. McDougall, Rainer Feistel, Daniel G. Wright, Stephen M. Griffies, 2006: Algorithms for density, potential temperature, Conservative Temperature, and the freezing temperature of seawater. J. Atmos. Oceanic Technol., 23, 1709–1728. doi: 10.1175/JTECH1946.1
Algorithms are presented for density, potential temperature, Conservative Temperature, and the freezing temperature of seawater. The algorithms for potential temperature and density (in terms of potential temperature) are updates to routines recently published by McDougall et al., while the algorithms involving Conservative Temperature and the freezing temperatures of seawater are new. The McDougall et al. algorithms were based on the thermodynamic potential of Feistel and Hagen; the algorithms in this study are all based on the "new extended Gibbs thermodynamic potential of seawater" of Feistel. The algorithm for the computation of density in terms of salinity, pressure, and Conservative Temperature produces errors in density and in the corresponding thermal expansion coefficient of the same order as errors for the density equation using potential temperature, both being twice as accurate as the International Equation of State (EOS-80) when compared with Feistel's new equation of state. An inverse function relating potential temperature to Conservative Temperature is also provided. The difference between Practical Salinity and Absolute Salinity is discussed, and it is shown that the present practice of essentially ignoring the difference between these two different salinities is unlikely to cause significant errors in ocean models.
Matlab and Fortran implementations of algorithms are available for
Professor Trevor J. McDougall School of Mathematics and Statistics University of New South Wales Sydney NSW 2052 Australia.