Contents
USAGE:
enthalpy_diff_CT = gsw_enthalpy_diff_CT(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_diff_CT25(SA,CT,p), which uses the computationally
efficient 25-term expression for density in terms of SA, CT and p
(McDougall et al., (2010)). For SA, CT and p values which fall inside
the oceanographic "funnel" (McDougall et al., 2010), this
computationally efficient (i. e. faster) 25-term version fits the
underlying laboratory density data almost as well as does the density
derived from the full TEOS-10 Gibbs function.
INPUT:
SA = Absolute Salinity [ g/kg ]
CT = Conservative Temperature [ deg C ]
p_shallow = upper sea pressure [ dbar ]
(ie. shallower absolute pressure - 10.1325 dbar)
p_deep = lower sea pressure [ dbar ]
(ie. 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 = 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 = gsw_enthalpy_diff_CT(SA,CT,p_shallow,p_deep)
enthalpy_diff_CT =
1.0e+002 *
9.784255933006788
9.780212984387035
9.759516776633390
9.727494888619550
9.708138965635516
9.687770207718350
AUTHOR:
Trevor McDougall and Paul Barker [ help_gsw@csiro.au ]
VERSION NUMBER:
2.0 (29th September, 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 Eqns. (3.32.2) 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