Compute Practical or Absolute Salinity, given in-situ or Conservative
Temperature, density, and pressure. This is mainly used to draw isopycnal
lines on TS diagrams, hence the dual meanings for salinity and temperature,
depending on the value of eos.
Usage
swSTrho(
temperature,
density,
pressure,
eos = getOption("oceEOS", default = "gsw")
)Arguments
- temperature
in-situ temperature (\(^\circ\)C), defined on the ITS-90 scale; see “Temperature units” in the documentation for
swRho().- density
in-situ density or sigma value (\(kg/m^3\))
- pressure
in-situ pressure (dbar)
- eos
equation of state, either
"unesco"(see references 1 and 2) or"gsw"(see references 3 and 4).
Details
For eos="unesco", finds the practical salinity that yields the given
density, with the given in-situ temperature and pressure. The method is a
bisection search with a salinity tolerance of 0.001. For eos="gsw",
the function gsw::gsw_SA_from_rho() in the gsw
package is used
to infer Absolute Salinity from Conservative Temperature.
References
Fofonoff, P. and R. C. Millard Jr, 1983. Algorithms for computation of fundamental properties of seawater. Unesco Technical Papers in Marine Science, 44, 53 pp
Gill, A.E., 1982. Atmosphere-ocean Dynamics, Academic Press, New York, 662 pp.
IOC, SCOR, and IAPSO (2010). The international thermodynamic equation of seawater-2010: Calculation and use of thermodynamic properties. Technical Report 56, Intergovernmental Oceanographic Commission, Manuals and Guide.
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
Other functions that calculate seawater properties:
T68fromT90(),
T90fromT48(),
T90fromT68(),
computableWaterProperties(),
locationForGsw(),
swAbsoluteSalinity(),
swAlpha(),
swAlphaOverBeta(),
swBeta(),
swCSTp(),
swConservativeTemperature(),
swDepth(),
swDynamicHeight(),
swLapseRate(),
swN2(),
swPressure(),
swRho(),
swRrho(),
swSCTp(),
swSR(),
swSigma(),
swSigma0(),
swSigma1(),
swSigma2(),
swSigma3(),
swSigma4(),
swSigmaT(),
swSigmaTheta(),
swSoundAbsorption(),
swSoundSpeed(),
swSpecificHeat(),
swSpice(),
swSpiciness0(),
swSpiciness1(),
swSpiciness2(),
swSstar(),
swTFreeze(),
swTSrho(),
swThermalConductivity(),
swTheta(),
swViscosity(),
swZ()