gsw_enthalpy_diff_CT_exact

difference of enthalpy at two pressures

Contents

USAGE:

enthalpy_diff_CT_exact = gsw_enthalpy_diff_CT_exact(SA,CT,p_shallow,p_deep)

DESCRIPTION:

Calculates the difference of the specific enthalpy of seawater between
two different pressures, p_deep (the deeper pressure) and p_shallow
(the shallower pressure), at the same values of SA and CT.  The output
(enthalpy_diff) is the specific enthalpy evaluated at (SA,CT,p_deep)
minus the specific enthalpy at (SA,CT,p_shallow).
Note that this function uses the full Gibbs function.  There is an 
alternative to calling this function, namely gsw_enthalpy_CT(SA,CT,p),
which uses the computationally-efficient 48-term expression for density 
in terms of SA, CT and p (McDougall et al., 2011).
TEOS-10 
Click for a more detailed description of the difference
of enthalpy between two pressures.

INPUT:

SA         =  Absolute Salinity                                 [ g/kg ]
CT         =  Conservative Temperature                         [ deg C ]
p_shallow  =  upper sea pressure                                [ dbar ]
              ( i.e. shallower absolute pressure - 10.1325 dbar )
p_deep     =  lower sea pressure                                [ dbar ]
              ( i.e. deeper absolute pressure - 10.1325 dbar )
p_shallow and p_deep may have dimensions Mx1 or 1xN or MxN,
where SA and CT are MxN.

OUTPUT:

enthalpy_diff_CT_exact  =  difference of specific enthalpy      [ J/kg ]
                       (deep minus shallow)

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_shallow =  [     10;      50;     125;     250;     600;    1000;]
p_deep    =  [    110;     150;     225;     350;     700;    1100;]
enthalpy_diff_CT_exact = gsw_enthalpy_diff_CT_exact(SA,CT,p_shallow,p_deep)
enthalpy_diff_CT_exact =
1.0e+002 *
   9.784255933006788
   9.780212984387035
   9.759516776633390
   9.727494888619550
   9.708138965635516
   9.687770207718350

AUTHOR:

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

VERSION NUMBER:

3.01 (18th May, 2011)

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 Eqns. (3.32.2) of this TEOS-10 Manual.
McDougall T.J., P.M. Barker, R. Feistel and D.R. Jackett, 2011:  A 
 computationally efficient 48-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