# gsw_beta_const_pt

    saline contraction coefficient at constant
    potential temperature

## Contents

- USAGE:
- DESCRIPTION:
- INPUT:
- OUTPUT:
- EXAMPLE:
- AUTHOR:
- VERSION NUMBER:
- REFERENCES:

## USAGE:

    beta_const_pt = gsw_beta_const_pt(SA,t,p)

## DESCRIPTION:

    Calculates the saline (haline) contraction coefficient of seawater at
    constant potential temperature with a reference pressure of 0 dbar.

    Click for a more detailed description of the saline
    contraction coefficient at constant potential
    temperature.

## 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:

    beta_const_pt  =  saline contraction coefficient                [ kg/g ]
                      at constant potential temperature
                      with a reference pressure of 0 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;]

    beta_const_pt = gsw_beta_const_pt(SA,t,p)

    beta_const_pt =

    1.0e-003 *

     0.731118367454125
     0.731059415831298
     0.735986955829449
     0.753748863626444
     0.757121845539448
     0.758434161456822

## AUTHOR:

    David Jackett, Trevor McDougall and Paul Barker [ help_gsw@csiro.au ]

## VERSION NUMBER:

    2.0 (23rd July, 2010)

## 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. (2.19.2) of this TEOS-10 manual.

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