# gsw_SA_from_Sstar

Absolute Salinity from Preformed Salinity

## USAGE:

[SA, in_ocean] = gsw_SA_from_Sstar(Sstar,p,long,lat)

## DESCRIPTION:

Calculates Absolute Salinity from Preformed Salinity.

## INPUT:

Sstar  =  Preformed Salinity                                    [ g/kg ]
p      =  sea pressure                                          [ dbar ]
( ie. absolute pressure - 10.1325 dbar )
long   =  longitude in decimal degrees                    [ 0 ... +360 ]
or  [ -180 ... +180 ]
lat    =  latitude in decimal degrees north              [ -90 ... +90 ]
p, lat and long may have dimensions 1x1 or Mx1 or 1xN or MxN,
where Sstar is MxN.

## OUTPUT:

SA        =  Absolute Salinity                                  [ g/kg ]
in_ocean  =  0, if long and lat are a long way from the ocean
=  1, if long and lat are in the ocean
Note. This flag is only set when the observation is well and truly on
dry land; often the warning flag is not set until one is several
hundred kilometres inland from the coast.

## EXAMPLE:

Sstar = [34.7115; 34.8912; 35.0247; 34.8436; 34.7291; 34.7197;]
p =     [     10;      50;     125;     250;     600;    1000;]
lat =   [      4;       4;       4;       4;       4;       4;]
long =  [    188;     188;     188;     188;     188;     188;]
If the profile data refers to one location (one station) is it
acceptable to enter the station location once. (ie the following will
produce the same result as the input above).
Sstar = [34.7115; 34.8912; 35.0247; 34.8436; 34.7291; 34.7197;]
p =     [     10;      50;     125;     250;     600;    1000;]
lat =   4;
long =  188;
[SA, in_ocean] = gsw_SA_from_Sstar(Sstar,p,long,lat)
SA =                             in_ocean =
34.711724663585905                  1
34.891561223296009                  1
35.025594598699882                  1
34.847235885385913                  1
34.736694493054166                  1
34.732387111902753                  1

## AUTHOR:

Trevor McDougall and 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 and appendices A.4 and A.5 of this TEOS-10 Manual.
McDougall, T.J., D.R. Jackett, F.J. Millero, R. Pawlowicz and
P.M. Barker, 2012: A global algorithm for estimating Absolute Salinity.
Ocean Science, 8, 1123-1134.
http://www.ocean-sci.net/8/1123/2012/os-8-1123-2012.pdf
The software is available from http://www.TEOS-10.org