gsw_sigma0_CT_exact
potential density anomaly, being potential density
minus 1000 kg/m^3
Contents
USAGE:
sigma0_CT_exact = gsw_sigma0_CT_exact(SA,CT)
DESCRIPTION:
Calculates potential density anomaly with reference sea pressure of
zero dbar.
Note that this function uses the full Gibbs function. There is an
alternative to calling this function, namely gsw_sigma1(SA,CT), which
uses the computationally efficient 48-term expression for density in
terms of SA, CT and p (McDougall et al., 2011).
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".
INPUT:
SA = Absolute Salinity [ g/kg ]
CT = Conservative Temperature [ deg C ]
SA & CT need to have the same dimensions.
OUTPUT:
sigma0_CT_exact = potential density anomaly with [ kg/m^3 ]
respect to a reference pressure of 0 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;]
sigma0_CT_exact = gsw_sigma0_CT_exact(SA,CT)
sigma0_CT_exact =
21.798152387272808
22.052493577393079
23.893577037223736
26.667619272292086
27.107232725897575
27.409628653483423
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.
The software is available from http://www.TEOS-10.org