# gsw_deltaSA_from_rho_t_exact

`Absolute Salinity Anomaly from density measurements`

## USAGE:

`deltaSA = gsw_deltaSA_from_rho_t_exact(rho,SP,t,p)`

## DESCRIPTION:

```Calculates the Absolute Salinity Anomaly of a seawater sample, for given values
of its density, Practical Salinity, in-situ temperature and sea pressure (in dbar).```
 ```Click for a more detailed description of calculating Absolute Salinity Anomaly 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'.
SP  =  Practical Salinity  (PSS-78)                         [ unitless ]
t   =  in-situ temperature (ITS-90)                            [ deg C ]
p   =  sea pressure                                             [ dbar ]
( i.e. absolute pressure - 10.1325 dbar )```
```rho, SP & t need to have the same dimensions.
p may have dimensions 1x1 or Mx1 or 1xN or MxN, where rho, SP & t are MxN.```

## OUTPUT:

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

## EXAMPLE:

```rho = [1021.8425; 1022.2661; 1024.4327;  1027.7977; 1029.8479; 1032.0124;]
SP  = [ 34.5487 ; 34.7274;  34.8605;  34.6809;  34.5679;  34.5600;]
t   = [ 28.7856;  28.4329;  22.8103;  10.2600;   6.8863;   4.4036;]
p   = [      10;       50;      125;      250;      600;     1000;]```
`deltaSA = gsw_deltaSA_from_rho_t_exact(rho,SP,t,p)`
```   0.003302579867899
0.004908323316101
0.007327963978994
0.012442769576580
0.018757996644624
0.022202079314248```

## 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`