gsw_sigma4_CT

potential density anomaly with reference pressure 
of 4000 dbar, this being this particular potential
density minus 1000 kg/m^3.

Contents

USAGE:

sigma4_CT = gsw_sigma4_CT(SA,CT)

DESCRIPTION:

Calculates potential density anomaly with reference sea pressure of
4000 dbar.
TEOS-10
Click for a more detailed description of potential
density anomaly with pr of 4000 dbar (sigma_4).

INPUT:

SA  =  Absolute Salinity                                        [ g/kg ]
CT  =  Conservative Temperature                                [ deg C ]
SA & CT need to have the same dimensions.

OUTPUT:

sigma4_CT  =  potential density anomaly with                  [ kg/m^3 ]
              respect to a reference pressure of 4000 dbar,
              that is, this potential density - 1000 kg/m^3.

EXAMPLE:

SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
CT = [28.8099; 28.4392; 22.7862; 10.2262;  6.8272;  4.3236;]
sigma4_CT = gsw_sigma4_CT(SA,CT)
sigma4_CT =
 37.899615932915594
 38.166310327096426
 40.280942547164841
 43.896123296674659
 44.631612266276306
 45.171743792926918

AUTHOR:

Trevor McDougall & Paul Barker  [ help_gsw@csiro.au ]

VERSION NUMBER:

2.0 (26th August, 2010)

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 Eqn. (A.30.1) of this TEOS-10 Manual.
The software is available from http://www.TEOS-10.org