gsw_SP_from_R

Practical Salinity from conductivity ratio,R

Contents

USAGE:

SP = gsw_SP_from_R(R,t,p)

DESCRIPTION:

Calculates Practical Salinity, SP, from the conductivity ratio, R,
primarily using the PSS-78 algorithm.  Note that the PSS-78 algorithm 
for Practical Salinity is only valid in the range 2 < SP < 42.  If the 
PSS-78 algorithm produces a Practical Salinity that is less than 2 then 
the Practical Salinity is recalculated with a modified form of the 
Hill et al. (1986) formula.  The modification of the Hill et al. (1986)
expression are to ensure that it is exactly consistent with PSS-78 
at SP = 2.
TEOS-10 
Click for a more detailed description of calculating
Practical Salinity from conductivity ratio.

INPUT:

R  =  Conductivity ratio                                    [ unitless ]
t  =  in-situ temperature (ITS-90)                             [ deg C ]
p  =  sea pressure                                              [ dbar ]
      ( ie. absolute pressure - 10.1325 dbar )
t & p may have dimensions 1x1 or Mx1 or 1xN or MxN, where R is MxN.

OUTPUT:

SP  =  Practical Salinity on the PSS-78 scale               [ unitless ]

EXAMPLE:

R = [ 1.3145;  1.3123;  1.1807;  0.8886; 0.8169; 0.7687;]
t = [28.7856; 28.4329; 22.8103; 10.2600; 6.8863; 4.4036;]
p = [     10;      50;     125;     250;    600;   1000;]
SP = gsw_SP_from_R(R,t,p)
SP =
  34.547219254816596
  34.727400381174370
  34.859100827188712
  34.679845200922003
  34.567856165219020
  34.561679175326645

AUTHOR:

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

VERSION NUMBER:

3.01 (23rd May, 2011)

REFERENCES:

Hill, K.D., T.M. Dauphinee and D.J. Woods, 1986: The extension of the
 Practical Salinity Scale 1978 to low salinities. IEEE J. Oceanic Eng.,
 OE-11, 1, 109 - 112.
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 appendix E of this TEOS-10 Manual.
Unesco, 1983: Algorithms for computation of fundamental properties of
 seawater. Unesco Technical Papers in Marine Science, 44, 53 pp.
The software is available from http://www.TEOS-10.org