# gsw_thermobaric

    thermobaric coefficient (48-term equation)

## Contents

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

## USAGE:

    thermobaric = gsw_thermobaric(SA,CT,p)

## DESCRIPTION:

    Calculates the thermobaric coefficient of seawater with respect to
    Conservative Temperature. This routine calculates rho from the
    computationally-efficient 48-term expression for density in terms of
    SA, CT and p (McDougall et al., 2011).

    Click for a more detailed description of the thermobaric
    coefficient.

## INPUT:

    SA  =  Absolute Salinity                                        [ g/kg ]
    CT  =  Conservative Temperature                                [ deg C ]
    p   =  sea pressure                                             [ dbar ]
           ( i.e. absolute pressure - 10.1325 dbar )

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

## OUTPUT:

    thermobaric  =  thermobaric coefficient with respect
                    to Conservative Temperature.               [ 1/(K Pa) ]
    Note. The pressure derivative is taken with respect to
      pressure in Pa not dbar.

## EXAMPLE:

    SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
    CT = [28.8099; 28.4392; 22.7862; 10.2262;  6.8272;  4.3236;]
    p =  [     10;      50;     125;     250;     600;    1000;]

    thermobaric = gsw_thermobaric(SA,CT,p)

    thermobaric =

     1.0e-011 *

       0.140572143832351
       0.141670674497644
       0.163021073886889
       0.225896125181403
       0.246017471408146
       0.261310958182461

## AUTHOR:

    David Jackett, Trevor McDougall and Paul Barker   [ help@teos-10.org ]

## VERSION NUMBER:

    3.02 (17th November, 2012)

## 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 Eqns. (3.8.2) and (P.2) of this TEOS-10 manual.

    McDougall T.J., P.M. Barker, R. Feistel and D.R. Jackett, 2013:  A
     computationally efficient 48-term expression for the density of
     seawater in terms of Conservative Temperature, and related properties
     of seawater.  To be submitted to J. Atm. Ocean. Technol., xx, yyy-zzz.

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