## Contents

## USAGE:

pt = gsw_pt_from_t(SA,t,p,p_ref)

## DESCRIPTION:

Calculates potential temperature with the general reference pressure,
p_ref, from in-situ temperature, t.
This function calls "gsw_entropy_part" which evaluates entropy, except
for the parts which are a function of Absolute Salinity alone.

## INPUT:

SA = Absolute Salinity [ g/kg ]
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).

SA & t need to have the same dimensions. p & pr (if provided) may
have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & t are MxN.

A faster gsw routine exists if pr is indeed zero dbar, this routine
is "gsw_pt0_from_t(SA,t,p)".

## OUTPUT:

pt = potential temperature with [ deg C ]
reference pressure, p_ref. (ITS-90)

## EXAMPLE:

SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
t = [28.7856; 28.4329; 22.8103; 10.2600; 6.8863; 4.4036;]
p = [ 10; 50; 125; 250; 600; 1000;]
p_ref = 0

pt = gsw_pt_from_t(SA,t,p,p_ref)

pt =

28.783196819670632
28.420983342398962
22.784930399117108
10.230523661095731
6.829230224409661
4.324510571845719

## AUTHOR:

Trevor McDougall, David Jackett, Claire Roberts-Thomson 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 3.1 of this TEOS-10 Manual.

The software is available from http://www.TEOS-10.org