gsw_rho_CT25

in-situ density (25-term equation)

Contents

USAGE:

[rho_CT25, in_funnel) = gsw_rho_CT25(SA,CT,p)

DESCRIPTION:

Calculates in-situ density from Absolute Salinity and Conservative
Temperature, using the computationally-efficient 25-term expression
for density in terms of SA, CT and p (McDougall et al., 2010).
Note that potential density with respect to reference pressure, pr, is
obtained by calling this function with the pressure argument being pr
(i.e. "gsw_rho_CT25(SA,CT,pr)").
TEOS-10
Click for a more detailed description of in-situ density.

INPUT:

SA  =  Absolute Salinity                                        [ g/kg ]
CT  =  Conservative Temperature                                [ deg C ]
p   =  sea pressure                                             [ dbar ]
       (i.e. 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:

rho_CT25   =  in-situ density                                [ kg m^-3 ]
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;]
[rho_CT25, in_funnel) = gsw_rho_CT25(SA,CT,p)
rho_CT25 = gsw_rho_CT25(SA,CT,p)
rho_CT25 =                       in_funnel =
1.0e+003 *
  1.021839541498949                  1
  1.022261845123599                  1
  1.024426245497197                  1
  1.027792152543827                  1
  1.029838876568916                  1
  1.032002445797635                  1

AUTHOR:

David Jackett, Trevor McDougall and Paul Barker  [ help_gsw@csiro.au ]

VERSION NUMBER:

2.0 (23rd July, 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 appendix A.20 and appendix K 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