## Contents

## USAGE:

SA_freezing = gsw_SA_freezing_from_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, SA_freezing, is put equal to NaN.

## 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 0, air free )

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

## OUTPUT:

SA_freezing = 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

SA_freezing = gsw_SA_freezing_from_t_poly(t,p,saturation_fraction)

SA_freezing =

2.017072489768256
2.151989342038462
11.677649626115608
32.843128114999026
34.136459306273451
33.097427522625182

## AUTHOR:

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

## VERSION NUMBER:

3.05 (28th May, 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