Contents
USAGE:
p = gsw_p_from_z(z,lat)
DESCRIPTION:
Calculates sea pressure from height using computationally-efficient
25-term expression for density, in terms of SA, CT and p
(McDougall et al., 2010).
Note. Height (z) is NEGATIVE in the ocean. Depth is -z.
Depth is not used in the GSW computer software library.
INPUT:
z = height [ m ]
Note. At sea level z = 0, and since z (HEIGHT) is defined
to be positive upwards, it follows that while z is
positive in the atmosphere, it is NEGATIVE in the ocean.
lat = latitude in decimal degrees north [ -90 ... +90 ]
lat may have dimensions 1x1 or Mx1 or 1xN or MxN, where z is MxN.
OUTPUT:
p = sea pressure [ dbar ]
( ie. absolute pressure - 10.1325 dbar )
EXAMPLE:
z = [ 10; 50; 125; 250; 600; 1000;]
lat = 4;
p = gsw_p_from_z(z,lat)
p
1.0e+003 *
-0.010055217939908
-0.050271175099730
-0.125654885697343
-0.251232845042860
-0.602440507522266
-1.003076098067266
AUTHOR:
Trevor McDougall, Claire Roberts-Thomson and Paul Barker.
[ help_gsw@csiro.au ]
VERSION NUMBER:
2.0 (26th August, 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.
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.
Saunders, P. M., 1981: Practical conversion of pressure to depth.
Journal of Physical Oceanography, 11, 573-574.
Moritz (2000) Goedetic reference system 1980. J. Geodesy, 74, 128-133.
This software is available from http://www.TEOS-10.org