# gsw_alpha_wrt_pt_t_exact

**thermal expansion coefficient with respect to
potential temperature**

## Contents

## USAGE:

alpha_wrt_pt_t_exact = gsw_alpha_wrt_pt_t_exact(SA,t,p)

## DESCRIPTION:

Calculates the thermal expansion coefficient of seawater with respect to
potential temperature, with a reference pressure of zero.

## INPUT:

SA = Absolute Salinity [ g/kg ]
t = in-situ temperature (ITS-90) [ deg C ]
p = sea pressure [ dbar ]
(ie. absolute pressure - 10.1325 dbar)

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

## OUTPUT:

alpha_wrt_pt_t_exact = Thermal expansion coefficient [ 1/K ]
with respect to potential temperature,
and with a reference pressure of zero dbar.

## 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;]

alpha_wrt_pt_t_exact = gsw_alpha_wrt_pt_t_exact(SA,t,p)

alpha_wrt_pt_t_exact =

1.0e-003 *

0.325621974596088
0.323548679831175
0.281641477318055
0.173138875637364
0.146227722831487
0.129358812895628

## AUTHOR:

David Jackett, 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 Eqn. (2.18.2) of this TEOS-10 manual.

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