gsw_SA_from_rho

Absolute Salinity from density
(48-term equation)

Contents

USAGE:

SA = gsw_SA_from_rho(rho,CT,p)

DESCRIPTION:

Calculates the Conservative Temperature of maximum density of seawater.
This function returns the Conservative Temperature at which the density
of seawater is a maximum, at given Absolute Salinity, SA, and sea 
pressure, p (in dbar).  This function uses the computationally-
efficient 48-term expression for density in terms of SA, CT and p
(McDougall et al., 2011)
Note that the 48-term equation has been fitted in a restricted range of 
parameter space, and is most accurate inside the "oceanographic funnel" 
described in McDougall et al. (2011).  The GSW library function 
"gsw_infunnel(SA,CT,p)" is avaialble to be used if one wants to test if 
some of one's data lies outside this "funnel".
TEOS-10 
Click for a more detailed description of calculating the
Absolute Salinty from density.

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 )
rho & CT need to hve the same dimensions.
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(rho,CT,p)
SA =
  34.711382887931144
  34.891005107845949
  35.025429483046373
  34.846708947660034
  34.736425587999484
  34.732694768360886

AUTHOR:

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

VERSION NUMBER:

3.01 (26th May, 2011)

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.
McDougall T.J., P.M. Barker, R. Feistel and D.R. Jackett, 2011:  A 
 computationally efficient 48-term expression for the density of 
 seawater in terms of Conservative Temperature, and related properties
 of seawater.  To be submitted to Ocean Science Discussions. 
The software is available from http://www.TEOS-10.org