either practial salinity (in which case temperature
and pressure must be provided) or an oce object
(in which case salinity, etc. are inferred from the object).
pressure
pressure in dbar.
longitude
longitude of observation.
latitude
latitude of observation.
Value
Absolute Salinity in $g/kg$.
Details
If the first argument is an oce object, then values for
salinity, etc., are extracted from it, and used for the calculation, and
the corresponding arguments to the present function are ignored.
The absolute salinity is calculated using the GSW function
gsw_SA_from_SP. Typically, this is a fraction of a unit
higher than practical salinity as defined in the UNESCO formulae.
References
McDougall, T.J. and P.M. Barker, 2011: Getting started with
TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox, 28pp.,
SCOR/IAPSO WG127, ISBN 978-0-646-55621-5.
See Also
The related TEOS-10 quantity ``conservative temperature'' may be
computed with swConservativeTemperature. For a ctd object,
absolute salinity may also be recovered by indexing as e.g.
ctd[["absoluteSalinity"]] or ctd[["SA"]].