# gsw_pt_from_t_ice

`potential temperature of ice`

## USAGE:

`pt_ice = gsw_pt_from_t_ice(t,p,p_ref)`

## DESCRIPTION:

```Calculates potential temperature of ice with the general reference pressure,
p_ref, from in-situ temperature, t.```

## INPUT:

```t   =   in-situ temperature (ITS-90)                           [ deg C ]
p   =   sea pressure                                            [ dbar ]
( i.e. absolute pressure - 10.1325 dbar )```
```OPTIONAL:
p_ref = reference pressure                                      [ dbar ]
( i.e. absolute reference pressure - 10.1325 dbar )
(If reference pressure is not given then it is assumed that reference
pressure is zero).```
```p & pr (if provided) may have dimensions 1x1 or Mx1 or 1xN or MxN,
where t is MxN.```
```A faster gsw routine exists if pr is indeed zero dbar, this routine
is "gsw_pt0_from_t_ice(t,p)".```

## OUTPUT:

```pt_ice  =  potential temperature of ice with                   [ deg C ]
reference pressure, p_ref. (ITS-90)```

## EXAMPLE:

```t = [-10.7856; -13.4329; -12.8103; -12.2600;  -10.8863;  -8.4036;]
p =  [     10;      50;     125;     250;     600;    1000;]
p_ref = 0```
`pt_ice = gsw_pt_from_t_ice(t,p,p_ref)`
`pt_ice =`
```  -10.787787898205272
-13.443730926050661
-12.837427056999676
-12.314321615760921
-11.017040858094234
-8.622907355083147```

## 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`