## Contents

## USAGE:

CT = gsw_CT_from_enthalpy(SA,h,p)

## DESCRIPTION:

Calculates the Conservative Temperature of seawater, given the Absolute
Salinity, specific enthalpy, h, and pressure p. The specific enthalpy
input is the one calculated from the computationally-efficient 75-term
expression for specific volume in terms of SA, CT and p (Roquet et al.,
2015).

Note that the 75-term equation has been fitted in a restricted range of
parameter space, and is most accurate inside the "oceanographic funnel"
described in McDougall et al. (2003). The GSW library function
"gsw_infunnel(SA,CT,p)" is avaialble to be used if one wants to test if
some of one's data lies outside this "funnel".

## INPUT:

SA = Absolute Salinity [ g/kg ]
h = specific enthalpy [ J/kg ]
p = sea pressure [ dbar ]
( i.e. absolute pressure - 10.1325 dbar )

SA & h need to have the same dimensions.
p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & h are MxN.

## OUTPUT:

CT = Conservative Temperature ( ITS-90) [ deg C ]

## EXAMPLE:

SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
h = [1.15103e5; 1.14014e5; 0.92180e5; 0.43255e5; 0.33087e5; 0.26970e5;]
p = [ 10; 50; 125; 250; 600; 1000;]

CT = gsw_CT_from_enthalpy(SA,h,p)

CT =

28.809854569021972

28.439026483379287

22.786196534098817

10.226106994920777

6.827159682675204

4.323428660306681

## AUTHOR:

Trevor McDougall and Paul Barker. [ help@teos-10.org ]

## VERSION NUMBER:

3.05 (16th February, 2015)

## REFERENCES:

IOC, SCOR and IAPSO, 2010: The international thermodynamic equation of
seawater - 2010: Calculation and use of thermodynamic properties.
Intergovernmental Oceanographic Commission, Manuals and Guides No. 56,
UNESCO (English), 196 pp. Available from the TEOS-10 web site.

McDougall, T.J., D.R. Jackett, D.G. Wright and R. Feistel, 2003:
Accurate and computationally efficient algorithms for potential
temperature and density of seawater. J. Atmosph. Ocean. Tech., 20,
pp. 730-741.

Roquet, F., G. Madec, T.J. McDougall, P.M. Barker, 2015: Accurate
polynomial expressions for the density and specifc volume of seawater
using the TEOS-10 standard. Ocean Modelling.

The software is available from http://www.TEOS-10.org