# gsw_enthalpy_CT

    specific enthalpy of seawater

## Contents

- USAGE:
- DESCRIPTION:
- INPUT:
- OUTPUT:
- EXAMPLE:
- AUTHOR:
- VERSION NUMBER:
- REFERENCES:

## 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.

    Click for a more detailed description of enthalpy.

## 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