gsw_pt0_from_t

potential temperature with a reference 
sea pressure of zero dbar

Contents

USAGE:

pt0 = gsw_pt0_from_t(SA,t,p)

DESCRIPTION:

Calculates potential temperature with reference pressure, pr = 0 dbar.
The present routine is computationally faster than the more general
function "gsw_pt_from_t(SA,t,p,pr)" which can be used for any reference
pressure value.  This routine calls the library functions
"gsw_entropy_part(SA,t,p)", "gsw_entropy_part_zerop(SA,pt0)" and
"gsw_gibbs_pt0_pt0(SA,pt0)".
TEOS-10 
Click for a more detailed description of potential
temperature with a reference sea pressure of zero dbar.

INPUT:

SA  =   Absolute Salinity                                       [ g/kg ]
t   =   in-situ temperature (ITS-90)                           [ deg C ]
p   =   sea pressure                                            [ dbar ]
        (ie. absolute pressure - 10.1325 dbar)
SA & t need to have the same dimensions.
p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & t are MxN.

OUTPUT:

pt0   =  potential temperature                                 [ deg C ]
         with reference sea pressure (pr) = 0 dbar.
Note. The reference sea pressure of the output, pt0, is zero dbar.

EXAMPLE:

SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
t =  [28.7856; 28.4329; 22.8103; 10.2600;  6.8863;  4.4036;]
p =  [     10;      50;     125;     250;     600;    1000;]
pt0 = gsw_pt0_from_t(SA,t,p)
pt0 =
  28.783196819670632
  28.420983342398962
  22.784930399117108
  10.230523661095731
   6.829230224409661
   4.324510571845719

AUTHOR:

Trevor McDougall, David Jackett, Claire Roberts-Thomson and 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 section 3.1 of this TEOS-10 Manual.
McDougall T.J., P.M. Barker, R. Feistel and D.R. Jackett, 2011:  A 
 computationally efficient 48-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