# gsw_brineSA_CT_poly

    Absolute Salinity of seawater at the freezing point (poly)

## Contents

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

## USAGE:

    brineSA_CT = gsw_brineSA_CT_poly(CT,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 Conservative Temperature CT 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_CT, is put equal to NaN.

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

## INPUT:

    CT  =  Conservative 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 CT is MxN.

## OUTPUT:

    brineSA_CT  =  Absolute Salinity of seawater when it freezes, for
                   given input values of Conservative Temperature
                   pressure and air saturation fraction.            [ g/kg ]

## EXAMPLE:

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

    brineSA_CT = gsw_brineSA_CT_poly(CT,p,saturation_fraction)

    brineSA_CT =

       2.281810267791574
       2.418134292637866
      11.971996354707962
      32.867931280697242
      34.015087798565567
      32.856434895177244

## 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