Contents
USAGE:
enthalpy = gsw_enthalpy_CT(SA,CT,p)
DESCRIPTION:
Calculates specific enthalpy of seawater from Absolute Salinity and
Conservative Temperature and pressure.
Note that this function uses the full Gibbs function. There is an
alternative to calling this function, namely gsw_enthalpy_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 = 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 ]
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 = gsw_enthalpy_CT(SA,CT,p)
enthalpy =
1.0e+005 *
1.151031813321767
1.140146925586514
0.921800131787836
0.432553712315790
0.330871615358722
0.269706848807403
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 appendix A.11 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