# gsw_SA_from_rho_t_exact

**Absolute Salinity from density measurements**

## Contents

## USAGE:

SA = gsw_SA_from_rho_t_exact(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).

## 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_t_exact(rho,t,p)

34.710229656274947
34.890576832371579
35.023324209337552
34.849520963839424
34.738248094721804
34.731883839457986

## 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 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