# gsw_cndr_from_SP

    conductivity ratio from Practical Salinity

## Contents

- USAGE:
- DESCRIPTION:
- INPUT:
- OUTPUT:
- EXAMPLE:
- AUTHOR:
- VERSION NUMBER:
- REFERENCES:

## USAGE:

    R = gsw_cndr_from_SP(SP,t,p)

## DESCRIPTION:

    Calculates conductivity ratio (R) from (SP,t,p) using PSS-78.  Note that
    the PSS-78 algorithm for Practical Salinity is only valid in the
    range 2 < SP < 42.

    Click for a more detailed description of calculating the
    conductivity ratio from Practical Salinity.

## INPUT:

    SP  =  Practical Salinity  (PSS-78)                         [ unitless ]
    t   =  in-situ temperature (ITS-90)                            [ deg C ]
    p   =  sea pressure                                             [ dbar ]
           (ie. absolute pressure - 10.1325 dbar)

    SP & t need to have the same dimensions.
    p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SP & t are MxN.

## OUTPUT:

    R   =  conductivity ratio                                   [ unitless ]

## EXAMPLE:

    SP = [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;]

    R = gsw_cndr_from_SP(SP,t,p)

    R =

     1.314550020542723
     1.312303341629415
     1.180742166518467
     0.888626530644618
     0.816903053491821
     0.768666416740220

## AUTHOR:

    Phil Morgan                [ help_gsw@csiro.au ]

     MODIFIED:
     25th June, 1999. Lindsay Pender, Fixed transpose of row vectors.
     12th December, 2003. Lindsay Pender, Converted to ITS-90.
     16th August, 2010. Paul Barker, Regrouped.

## VERSION NUMBER:

    2.0 (16th August, 2010)

## REFERENCES:

    Fofonoff, P. and R.C .Millard, Jr, 1983: Algorithms for computation of
     fundamental properties of seawater, 1983. Unesco Tech. Pap. in Mar.
     Sci., No. 44, 53 pp.

    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.

    The software is available from http://www.TEOS-10.org