# gsw_specvol_CT25

    specific volume (25-term equation)

## Contents

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

## USAGE:

    [specvol_CT25, in_funnel] = gsw_specvol_CT25(SA,CT,p)

## DESCRIPTION:

    Calculates specific volume from Absolute Salinity, Conservative
    Temperature and pressure, using the computationally-efficient 25-term
    expression for density (McDougall et al., 2010).

    Click for a more detailed description of specific volume.

## INPUT:

    SA  =  Absolute Salinity                                        [ g/kg ]
    CT  =  Conservative Temperature                                [ deg C ]
    p   =  sea pressure                                             [ dbar ]
           (ie. 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 and CT are MxN.

## OUTPUT:

    specvol_CT25  =  specific volume                             [ kg m^-3 ]
    in_funnel     =  0, if SA, CT and p are outside the "funnel"
                  =  1, if SA, CT and p are inside the "funnel"
    Note. The term "funnel" describes the range of SA, CT and p over which
      the error in the fit of the computationally-efficient 25-term
      expression for density was calculated (McDougall et al., 2010).

## 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;]

    [specvol_CT25, in_funnel] = gsw_specvol_CT25(SA,CT,p)

    specvol_CT25 =               in_funnel =

     1.0e-003 *

      0.978627229998447              1
      0.978222952143042              1
      0.976156169753986              1
      0.972959364911436              1
      0.971025684456263              1
      0.968989951595608              1

## AUTHOR:

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

## VERSION NUMBER:

    2.0 (26th August, 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. (2.7.2) of this TEOS-10 Manual.

    McDougall T. J., D. R. Jackett, P. M. Barker, C. Roberts-Thomson, R.
     Feistel and R. W. Hallberg, 2010:  A computationally efficient 25-term
     expression for the density of seawater in terms of Conservative
     Temperature, and related properties of seawater.  To be submitted
     to Ocean Science Discussions.

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