# gsw_t_freezing_poly

`in-situ temperature freezing point (poly)`

## USAGE:

`t_freezing = gsw_t_freezing_poly(SA,p,saturation_fraction)`

## DESCRIPTION:

`Calculates in-situ temperature freezing point of sea water.`
 ```Click for a more detailed description of calculating in-situ temperature freezing.```

## INPUT:

```SA  =  Absolute Salinity                                        [ g/kg ]
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 SA is MxN.```

## OUTPUT:

```t_freezing = in-situ temperature at which seawater freezes.    [ deg C ]
(ITS-90)           ```

## EXAMPLE:

```SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
p =  [     10;      50;     125;     250;     600;    1000;]
saturation_fraction = 1;```
`t_freezing = gsw_t_freezing_poly(SA,p,saturation_fraction)`
`t_freezing =`
```  -1.902704434299200
-1.942897945475226
-2.006877364578649
-2.091041391538033
-2.351431560178946
-2.660685237633709```

## AUTHOR:

`Paul Barker, Trevor McDougall and Rainer Feistal    [ 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`