gsw_thermobaric_CT25

thermobaric coefficient (25-term equation)

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).
TEOS-10
Click for a more detailed description of the thermobaric
coefficient.

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