# gsw_pt_from_pot_enthalpy_ice_poly

    potential temperature of ice with a reference sea
    pressure of zero dbar from the potential enthalpy
    of ice (polynomial)

## Contents

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

## USAGE:

    pt0_ice = gsw_pt_from_pot_enthalpy_ice_poly(pot_enthalpy_ice)

## DESCRIPTION:

    Calculates the potential temperature of ice from the potential enthalpy
    of ice.  The reference sea pressure of both the potential temperature
    and the potential enthalpy is zero dbar. This is a compuationally
    efficient polynomial fit to the potential enthalpy of ice.

## INPUT:

    pot_enthalpy_ice  =  potential enthalpy of ice                  [ J/kg ]

## OUTPUT:

    pt0_ice   =  potential temperature of ice                      [ deg C ]
            with reference sea pressure (pr) = 0 dbar.
    Note. The reference sea pressure of the output, pt, is zero dbar.

## EXAMPLE:

    pot_enthalpy_ice = [-3.5544e5; -3.6033e5; -3.5830e5; -3.5589e5; -3.4948e5; -3.4027e5;]

    pt0_ice = gsw_pt_from_pot_enthalpy_ice_poly(pot_enthalpy_ice)

    pt0_ice =

      -10.733085986035007
      -13.167396204945987
      -12.154204137867396
      -10.956201046447006
       -7.794963341294590
       -3.314907552013722

## AUTHOR:

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

## VERSION NUMBER:

    3.05 (16th February, 2015)

## 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.

    McDougall, T.J., P.M. Barker, R. Feistel and B.K. Galton-Fenzi, 2014:
     Melting of Ice and Sea Ice into Seawater and Frazil Ice Formation.
     Journal of Physical Oceanography, 44, 1751-1775.

    The software is available from http://www.TEOS-10.org