# gsw_brineSA_t_poly

    Absolute Salinity of seawater at the freezing point (poly)

## Contents

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

## USAGE:

    brineSA_t = gsw_brineSA_t_poly(t,p,saturation_fraction)

## DESCRIPTION:

    Calculates the Absolute Salinity of seawater at the freezing temperature.
    That is, the output is the Absolute Salinity of seawater, with the
    fraction saturation_fraction of dissolved air, that is in equilibrium
    with ice at in-situ temperature t and pressure p.  If the input
    values are such that there is no positive value of Absolute Salinity for
    which seawater is frozen, the output, brineSA_t, is put equal to NaN.

    Click for a more detailed description of calculating
    Absolute Salinity of seawater at the freezing point.

## INPUT:

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

    OPTIONAL:
    saturation_fraction = the saturation fraction of dissolved air in
                          seawater.
     ( i.e., saturation_fraction must be between 0 and 1, and the default
       is 1, completely saturated )

    p & saturation_fraction (if provided) may have dimensions 1x1 or Mx1 or
    1xN or MxN, where t is MxN.

## OUTPUT:

    brineSA_t  =  Absolute Salinity of seawater when it freezes, for
                  given input values of in-situ temperature
                  pressure and air saturation fraction.             [ g/kg ]

## EXAMPLE:

    t = [-0.11901; -0.15608;  -0.72138; -1.97738;  -2.31728;  -2.56764;]
    p =  [     10;      50;     125;     250;     600;    1000;]
    saturation_fraction = 1

    brineSA_t = gsw_brineSA_t_poly(t,p,saturation_fraction)

    brineSA_t =

       2.017072489768256
       2.151989342038463
      11.677649626115610
      32.843128114999026
      34.136459306273444
      33.097427522625168

## 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.
      See section 3.3 of this TEOS-10 Manual.

    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