gsw_SP_from_C

Practical Salinity from conductivity, C

Contents

USAGE:

SP = gsw_SP_from_C(C,t,p)

DESCRIPTION:

Calculates Practical Salinity, SP, from conductivity, C, 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 is to ensure that it is exactly consistent with PSS-78 
at SP = 2.  Note that the input values of conductivity need to be in 
units of mS/cm (not S/m).
TEOS-10 
Click for a more detailed description of calculating
Practical Salinity from conductivity.

INPUT:

C  =  Conductivity                                             [ mS/cm ]
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 C is MxN.

OUTPUT:

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

EXAMPLE:

C = [34.5487; 34.7275; 34.8605; 34.6810; 34.5680; 34.5600;]
t = [28.7856; 28.4329; 22.8103; 10.2600; 6.8863; 4.4036;]
p = [     10;      50;     125;     250;    600;   1000;]
SP = gsw_SP_from_C(C,t,p)
SP =
  20.009869599086951
  20.265511864874270
  22.981513062527689
  31.204503263727982
  34.032315787432829
  36.400308494388170

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