Contents
USAGE:
[thermobaric_CT25, in_funnel] = gsw_thermobaric_CT25(SA,CT,p)
DESCRIPTION:
Calculates the thermobaric coefficient of seawater with respect to
Conservative Temperature. This routine calculates rho from the
computationally-efficient 25-term expression for density in terms of
SA, CT and p (McDougall et al., 2010).
INPUT:
SA = Absolute Salinity [ g/kg ]
CT = Conservative Temperature [ deg C ]
p = sea pressure [ dbar ]
( ie. absolute pressure - 10.1325 dbar )
SA & CT need to have the same dimensions.
p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & CT are MxN.
OUTPUT:
thermobaric_CT25 = Thermobaric coefficient with respect
to Conservative Temperature. [ 1/(K Pa) ]
Note. The pressure derivative is taken with respect to
pressure in Pa not dbar.
in_funnel = 0, if SA, CT and p are outside the "funnel"
= 1, if SA, CT and p are inside the "funnel"
Note. The term "funnel" describes the range of SA, CT and p over which
the error in the fit of the computationally-efficient 25-term
expression for density was calculated (McDougall et al., 2010).
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;]
p = [ 10; 50; 125; 250; 600; 1000;]
[thermobaric_CT25, in_funnel] = gsw_thermobaric_CT25(SA,CT,p)
thermobaric_CT25 =
1.0e-011 *
0.143712914501030
0.144525225115917
0.163502412605500
0.226474876009325
0.247208470958881
0.262712952286233
in_funnel =
1
1
1
1
1
1
AUTHOR:
David Jackett, Trevor McDougall and Paul Barker [ help_gsw@csiro.au ]
VERSION NUMBER:
2.0 (24th 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 Eqns. (3.8.2) and (P.2) of this TEOS-10 manual.
McDougall T. J., D. R. Jackett, P. M. Barker, C. Roberts-Thomson,
R. Feistel and R. W. Hallberg, 2010: A computationally efficient
25-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