# gsw_SA_from_rho_CT_exact

**Absolute Salinity from density**

## Contents

## USAGE:

SA = gsw_SA_from_rho_CT_exact(rho,CT,p)

## DESCRIPTION:

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

Note that this function uses the full Gibbs function. There is an
alternative to calling this function, namely gsw_SA_from_rho(rho,CT,p),
which uses the computationally-efficient 75-term expression for specific
volume in terms of SA, CT and p (Roquet et al., 2015).

## 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'.
CT = Conservative Temperature (ITS-90) [ deg C ]
p = sea pressure [ dbar ]
( i.e. absolute pressure - 10.1325 dbar )

p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA is MxN.

## OUTPUT:

SA = Absolute Salinity [ g/kg ]

## EXAMPLE:

rho = [1021.8482; 1022.2647; 1024.4207; 1027.7841; 1029.8287; 1031.9916;]
CT = [ 28.7856; 28.4329; 22.8103; 10.2600; 6.8863; 4.4036;]
p = [ 10; 50; 125; 250; 600; 1000;]

SA = gsw_SA_from_rho_CT_exact(rho,CT,p)

SA =

34.711744962132940
34.891394519876442
35.025512596134583
34.847096950195713
34.736476658622792
34.732297140137263

## AUTHOR:

Trevor McDougall & Paul Barker [ help@teos-10.org ]

## VERSION NUMBER:

3.05 (16th February, 2015)

## 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 3.42 of this TEOS-10 Manual.

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