# gsw_SA_from_rho

    Absolute Salinity from density measurements

## Contents

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

## USAGE:

    SA = gsw_SA_from_rho(rho,t,p)

## DESCRIPTION:

    Calculates the Absolute Salinity of a seawater sample, for given values
    of its density, in-situ temperature and sea pressure (in dbar).

    Click for a more detailed description of calculating
    Absolute Salinity from density measurements.

## INPUT:

    rho =  density of a seawater sample (e.g. 1026 kg/m^3).       [ kg/m^3 ]
     Note. This input has not had 1000 kg/m^3 subtracted from it.
       That is, it is 'density', not 'density anomaly'.
    t   =  in-situ temperature (ITS-90)                            [ deg C ]
    p   =  sea pressure                                             [ dbar ]
           (i.e. absolute pressure - 10.1325 dbar)

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

## OUTPUT:

    SA  =  Absolute Salinity.                                       [ g/kg ]
     Note. This is expressed on the Reference-Composition Salinity
       Scale of Millero et al. (2008).

## EXAMPLE:

    rho = [1021.839; 1022.262; 1024.426; 1027.792; 1029.839; 1032.002;]
    t   = [ 28.7856;  28.4329;  22.8103;  10.2600;   6.8863;   4.4036;]
    p   = [      10;       50;      125;      250;      600;     1000;]

    SA = gsw_SA_from_rho(rho,t,p)

     34.710229656274947
     34.890576832371579
     35.023324209337552
     34.849520963839424
     34.738248094721804
     34.731883839457986

## AUTHOR:

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

## VERSION NUMBER:

    2.0 (23rd 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 section 2.5 of this TEOS-10 Manual.

    Millero, F. J., R. Feistel, D. G. Wright, and T. J. McDougall, 2008:
     The composition of Standard Seawater and the definition of the
     Reference-Composition Salinity Scale, Deep-Sea Res. I, 55, 50-72.

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