gsw_isopycnal_slope_ratio
ratio of the slopes of isopycnals on the
SA-CT diagram for p and p_ref
(48-term equation)
Contents
USAGE:
isopycnal_slope_ratio = gsw_isopycnal_slope_ratio(SA,CT,p,p_ref)
DESCRIPTION:
Calculates the ratio of alpha_CT/beta_CT at pressure p to that at
pressure p_ref. This function uses the computationally-efficient 48-term
expression for density in terms of SA, CT & p (IOC et al., 2010).
INPUT:
SA = Absolute Salinity [ g/kg ]
CT = Conservative Temperature [ deg C ]
p = sea pressure [ dbar ]
( i.e. absolute pressure - 10.1325 dbar )
p_ref = reference pressure [ dbar ]
( i.e. absolute reference pressure - 10.1325 dbar )
SA & CT need to have the same dimensions.
p & p_ref may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & CT
are MxN
OUTPUT:
isopycnal_slope_ratio = The ratio of alpha_CT/beta_CT evaluated at
pressure p to that at pressure p_ref.
[ 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;]
p_ref = 0
isopycnal_slope_ratio = gsw_isopycnal_slope_ratio(SA,CT,p,p_ref)
isopycnal_slope_ratio =
1.000433182279743
1.002200292893216
1.007303249396101
1.033735662091619
1.112475997036696
1.254093597473423
AUTHOR:
Trevor McDougall, Paul Barker & David Jackett [ help@teos-10.org ]
VERSION NUMBER:
3.04 (10th December, 2013)
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. (3.17.2) of this TEOS-10 Manual.
This software is available from http://www.TEOS-10.org