gsw_pt_from_CT

potential temperature from Conservative Temperature

Contents

USAGE:

pt = gsw_pt_from_CT(SA,CT)

DESCRIPTION:

Calculates potential temperature (with a reference sea pressure of zero
dbar) from Conservative Temperature.  This function uses 1.5 iterations
through a modified Newton-Raphson (N-R) iterative solution proceedure,
starting from a rational-function-based initial condition for both pt
and dCT_dpt (McDougall and Wotherspoon, 2013).
TEOS-10 
Click for a more detailed description of calculating
potential temperature from Conservative Temperature.

INPUT:

SA   =   Absolute Salinity                                      [ g/kg ]
CT   =   Conservative Temperature                              [ deg C ]
SA & CT need to have the same dimensions.

OUTPUT:

pt   =   potential temperature referenced to a sea             [ deg C ]
         pressure of zero dbar (ITS-90)

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;]
pt = gsw_pt_from_CT(SA,CT)
pt =
   28.783177048624573
  28.420955597191984
  22.784953468087107
  10.230534394434429
   6.829216587061605
   4.324534835990236

AUTHOR:

Trevor McDougall, David Jackett, Claire Roberts-Thomson & Paul Barker
                                                     [ help@teos-10.org ]

VERSION NUMBER:

3.05 (16th February, 2015)

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 sections 3.1 and 3.3 of this TEOS-10 Manual.
McDougall, T.J., and S.J. Wotherspoon, 2014: A simple modification of 
 Newton’s method to achieve convergence of order "1 + sqrt(2)". Applied 
 Mathematics Letters, 29, 20-25.  
 http://dx.doi.org/10.1016/j.aml.2013.10.008 
The software is available from http://www.TEOS-10.org