gsw_enthalpy_CT25

enthalpy of seawater (25-term equation)

Contents

USAGE:

[enthalpy, in_funnel] =  gsw_enthalpy_CT25(SA,CT,p)

DESCRIPTION:

Calculates specific enthalpy of seawater using the computationally-
efficient 25-term expression for density in terms of SA, CT and p
(McDougall et al., 2010)
TEOS-10
Click for a more detailed description of enthalpy
calculated with the 25-term equation.

INPUT:

SA   =  Absolute Salinity                                       [ g/kg ]
CT   =  Conservative Temperature                               [ deg C ]
p    =  sea pressure                                            [ dbar ]
       (ie. absolute pressure - 10.1325 dbar)
SA & CT need to have the same dimensions.
p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & CT are MxN.

OUTPUT:

enthalpy   =  specific enthalpy                                 [ J/kg ]
in_funnel  =  0, if SA, CT and p are outside the "funnel"
           =  1, if SA, CT and p are inside the "funnel"
Note. The term "funnel" describes the range of SA, CT and p over which
  the error in the fit of the computationally-efficient 25-term
  expression for density was calculated (McDougall et al., 2010).

EXAMPLE:

SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
CT = [28.8099; 28.4392; 22.7862; 10.2262;  6.8272;  4.3236;]
p =  [     10;      50;     125;     250;     600;    1000;]
[enthalpy, in_funnel] =  gsw_enthalpy_CT25(SA,CT,p)
enthalpy =                     in_funnel =
1.0e+005 *
 1.151031813925039               1
 1.140146929487063               1
 0.921800148514069               1
 0.432553660538842               1
 0.330871524935877               1
 0.269706799089967               1

AUTHOR:

Trevor McDougall, David Jackett, Claire Roberts-Thomson and Paul Barker.
                                            [ help_gsw@csiro.au ]

VERSION NUMBER:

2.0 (26th August, 2010)

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.
  See Eqn. (A.30.6) of this TEOS-10 Manual.
McDougall T. J., D. R. Jackett, P. M. Barker, C. Roberts-Thomson, R.
 Feistel and R. W. Hallberg, 2010:  A computationally efficient 25-term
 expression for the density of seawater in terms of Conservative
 Temperature, and related properties of seawater.  To be submitted
 to Ocean Science Discussions.
The software is available from http://www.TEOS-10.org