gsw_ntp_pt_vs_CT_ratio

ratio of gradients of potential temperature
and Conservative Temperature in a neutral 
tangent plane (in a locally-referenced 
potential density surface) (48-term equation)

Contents

USAGE:

ntp_pt_vs_CT_ratio = gsw_ntp_pt_vs_CT_ratio(SA,CT,p)

DESCRIPTION:

Calculates the ratio of the two-dimensional gradient of potential
temperature versus that of Conservative Temperature, CT, along the
neutral tangent plane.  The potential temperature is the regular one
which has a reference sea pressure of 0 dbar.  Part of the calculation
uses the computationally-efficient 48-term expression for density in
terms of SA, CT and p (McDougall et al., 2011).
TEOS-10 
Click for a more detailed description of the ratio of
gradients of potential temperature and Conservative
Temperature in a neutral tangent plane.

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:

ntp_pt_vs_CT_ratio  =  The ratio of the spatial gradient of
                       potential temperature versus that of
                       Conservative Temperature in the
                       neutral tangent plane (ntp).         [ unitless ]

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;]
ntp_pt_vs_CT_ratio = gsw_ntp_pt_vs_CT_ratio(SA,CT,p)
ntp_pt_vs_CT_ratio =
   1.016134172546121
   1.016088031259560
   1.011783739650572
   1.004312619705692
   1.003010020870695
   1.002332840620775

AUTHOR:

Trevor McDougall and Paul Barker      [ help@teos-10.org ]

VERSION NUMBER:

3.01 (16th 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 Eqn. (A.14.5) 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. 
This software is available from http://www.TEOS-10.org