# gsw_pt0_from_t_ice

    potential temperature of ice with a reference
    sea pressure of zero dbar

## Contents

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

## USAGE:

    pt0_ice = gsw_pt0_from_t_ice(t,p)

## DESCRIPTION:

    Calculates potential temperature of ice with reference pressure,
    pr = 0 dbar.  The present routine is computationally faster than the
    more general function "gsw_pt_from_t_ice(t,p,pr)" which can be used
    for any reference pressure value.

## INPUT:

    t   =   in-situ temperature (ITS-90)                          [ deg C ]
    p   =   sea pressure                                           [ dbar ]
            (ie. absolute pressure - 10.1325 dbar)

    p may have dimensions 1x1 or Mx1 or 1xN or MxN, where t is MxN.

## OUTPUT:

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

## EXAMPLE:

    t = [-10.7856; -13.4329; -12.8103; -12.2600;  -10.8863;  -8.4036;]
    p = [     10;      50;     125;     250;     600;    1000;]

    pt0_ice = gsw_pt0_from_t_ice(t,p)

    pt0_ice =

      -10.787787898205298
      -13.443730926050607
      -12.837427056999708
      -12.314321615760905
      -11.017040858094250
       -8.622907355083088

## 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.

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