# gsw_sigma1_CT

    potential density anomaly with reference pressure
    of 1000 dbar, this being this particular potential
    density minus 1000 kg/m^3

## Contents

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

## USAGE:

    sigma1_CT = gsw_sigma1_CT(SA,CT)

## DESCRIPTION:

    Calculates potential density anomaly with reference sea pressure of
    1000 dbar.

    Click for a more detailed description of potential
    density anomaly with pr of 1000 dbar (sigma_1).

## INPUT:

    SA  =  Absolute Salinity                                        [ g/kg ]
    CT  =  Conservative Temperature                                [ deg C ]

    SA & CT need to have the same dimensions.

## OUTPUT:

    sigma1_CT  =  potential density anomaly with                  [ kg/m^3 ]
                  respect to a reference pressure of 1000 dbar,
                  that is, this potential density - 1000 kg/m^3.

## 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;]

    sigma1_CT = gsw_sigma1_CT(SA,CT)

    sigma1_CT =

     25.955551924297879
     26.213079338959005
     28.125625321852112
     31.120452618127047
     31.637685737359789
     32.002400877214541

## AUTHOR:

    Trevor McDougall & 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. (A.30.1) of this TEOS-10 Manual.

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