# gsw_CT_from_enthalpy

```Conservative Temperature from specific enthalpy
of seawater (75-term equation)```

## 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`