gsw_sigma2

potential density anomaly with reference pressure
of 2000 dbar, this being this particular potential
density minus 1000 kg/m^3

Contents

USAGE:

sigma2 = gsw_sigma2(SA,CT)

DESCRIPTION:

Calculates potential density anomaly with reference pressure of 2000 
dbar, this being this particular potential density minus 1000 kg/m^3.
This function has inputs of Absolute Salinity and Conservative
Temperature.
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 potential
density anomaly with p_ref of 2000 dbar (sigma_2).

INPUT:

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

OUTPUT:

sigma2  =  potential density anomaly with                     [ kg/m^3 ]
           respect to a reference pressure of 2000 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;]
sigma2 = gsw_sigma2(SA,CT)
sigma2 =
  30.022796416066058
  30.283471416890507
  32.265662479258935
  35.474477339783562
  36.066940033461151
  36.492038460911999

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 Eqn. (A.30.1) 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