Contents
USAGE:
[SA, Sstar, in_ocean] = gsw_SA_Sstar_from_SP(SP,p,long,lat)
DESCRIPTION:
Calculates Absolute Salinity and Preformed Salinity from Practical
Salinity. Since SP is non-negative by definition, this function
changes any negative input values of SP to be zero.
INPUT:
SP = Practical Salinity (PSS-78) [ unitless ]
p = sea pressure [ dbar ]
( ie. absolute pressure - 10.1325 dbar )
long = longitude in decimal degrees [ 0 ... +360 ]
or [ -180 ... +180 ]
lat = latitude in decimal degrees north [ -90 ... +90 ]
p, lat & long may have dimensions 1x1 or Mx1 or 1xN or MxN,
where SP is MxN.
OUTPUT:
SA = Absolute Salinity [ g/kg ]
Sstar = Preformed Salinity [ g/kg ]
in_ocean = 0, if long and lat are a long way from the ocean
= 1, if long and lat are in the ocean
Note. This flag is only set when the observation is well and truly on
dry land; often the warning flag is not set until one is several
hundred kilometres inland from the coast.
EXAMPLE:
SP = [34.5487; 34.7275; 34.8605; 34.6810; 34.5680; 34.5600;]
p = [ 10; 50; 125; 250; 600; 1000;]
lat = [ 4; 4; 4; 4; 4; 4;]
long = [ 188; 188; 188; 188; 188; 188;]
If the profile data refers to one location (one station) is it
acceptable to enter the station location once.
(ie the following will produce the same result as the input above).
SP = [34.5487; 34.7275; 34.8605; 34.6810; 34.5680; 34.5600;]
p = [ 10; 50; 125; 250; 600; 1000;]
lat = 4;
long = 188;
[SA, Sstar, in_ocean] = gsw_SA_Sstar_from_SP(SP,p,long,lat)
SA =
34.711779712893147
34.891523721622328
35.025547737221643
34.847230081708567
34.736629598766619
34.732361864645107
Sstar =
34.711553202053111
34.891161009146472
35.024649258886718
34.843592772087710
34.729033602488833
34.719676382802788
in_ocean =
1
1
1
1
1
1
AUTHOR:
David Jackett, Trevor McDougall & Paul Barker [ help_gsw@csiro.au ]
VERSION NUMBER:
2.0 (23rd July, 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.
See section 2.5 and appendices A.4 and A.5 of this TEOS-10 Manual.
McDougall, T.J., D.R. Jackett and F.J. Millero, 2010: An algorithm
for estimating Absolute Salinity in the global ocean. Submitted to
Ocean Science. A preliminary version is available at Ocean Sci. Discuss.,
6, 215-242.
http://www.ocean-sci-discuss.net/6/215/2009/osd-6-215-2009-print.pdf
The software is available from http://www.TEOS-10.org