Contents
USAGE:
[SA,CT] = gsw_SA_CT_from_sigma0_spiciness0(sigma0,spiciness0)
DESCRIPTION:
Calculates the Absolute Salinity and the Conservative Temperature of a
seawater sample at given values of potential density referenced to
0 dbar and spiciness0. This function uses the computationally-efficient
75-term expression for specific volume in terms of SA, CT and p
(Roquet et al., 2015).
Note that this 75-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. (2003). 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:
sigma0 = density anomaly of a seawater sample (e.g 26 kg/m^3)
referenced to 0 dbar [ kg/m^3 ]
Note. This input has had 1000 kg/m^3 subtracted from it. That is,
it is 'density anomaly', not 'density'.
spiciness0 = spiciness appropriate to 0 dbar, as given by the paper of
McDougall and Krzysik (2015), and the GSW algorithm
gsw_spiciness0(SA,CT) [ kg/m^3 ]
sigma0 and spiciness0 need to have the same dimensions.
OUTPUT:
SA = Absolute Salinity. [ g/kg ]
CT = Conservative Temperature (ITS-90) [ deg C ]
EXAMPLE:
sigma0 = [21.7979; 22.0522; 23.8930; 26.6676; 27.1074; 27.4097;]
spiciness0 = [ 5.7290; 5.7499; 4.1635; 1.0694; 0.4264; 0.0897;]
[SA,CT] = gsw_SA_CT_from_sigma0_spiciness0(sigma0,spiciness0)
SA =
34.711800450272577
34.891462385944791
35.025578083694874
34.847218272580029
34.736595459209234
34.732349892969246
CT =
28.809903466348750
28.439162940497393
22.786091646704868
10.226332048975316
6.827030481301175
4.323687506915744
AUTHOR:
Trevor McDougall and Paul Barker [ help@teos-10.org ]
VERSION NUMBER:
3.06.12 (2nd July, 2020)
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.
McDougall, T.J., D.R. Jackett, D.G. Wright and R. Feistel, 2003:
Accurate and computationally efficient algorithms for potential
temperature and density of seawater. J. Atmosph. Ocean. Tech., 20,
pp. 730-741.
McDougall, T.J., and O.A. Krzysik, 2015: Spiciness. Journal of
Marine Research, 73, 141-152.
Roquet, F., G. Madec, T.J. McDougall and P.M. Barker, 2015: Accurate
polynomial expressions for the density and specific volume of seawater
using the TEOS-10 standard. Ocean Modelling, 90, pp. 29-43.
http://dx.doi.org/10.1016/j.ocemod.2015.04.002
The software is available from http://www.TEOS-10.org