swSpice: Seawater spiciness

Description Usage Arguments Details Value Author(s) References See Also

View source: R/sw.R


Compute seawater "spice" (a variable orthogonal to density in TS space).


swSpice(salinity, temperature = NULL, pressure = NULL)



either salinity [PSU] (in which case temperature and pressure must be provided) or a ctd object (in which case salinity, temperature and pressure are determined from the object, and must not be provided in the argument list).


in-situ temperature [degC] on the ITS-90 scale; see “Temperature units” in the documentation for swRho.


seawater pressure [dbar]


If the first argument is a ctd object, then salinity, temperature and pressure values are extracted from it, and used for the calculation.

Roughly speaking, seawater with a high spiciness is relatively warm and salty compared with less spicy water. Another interpretation is that spice is a variable measuring distance orthogonal to isopycnal lines on TS diagrams (if the diagrams are scaled to make the isopycnals run at 45 degrees). The definition used here is that of Pierre Flament. (Other formulations exist.) Note that pressure is ignored in the definition. Spiciness is sometimes denoted pi(S,t,p).


Spice [kg/m^3].


Dan Kelley


P. Flament, 2002. A state variable for characterizing water masses and their diffusive stability: spiciness. Progr. Oceanog., 54, 493-501.

See Also

Other functions that calculate seawater properties: T68fromT90, T90fromT48, T90fromT68, swAbsoluteSalinity, swAlphaOverBeta, swAlpha, swBeta, swCSTp, swConservativeTemperature, swDepth, swDynamicHeight, swLapseRate, swN2, swPressure, swRho, swRrho, swSCTp, swSTrho, swSigma0, swSigma1, swSigma2, swSigma3, swSigma4, swSigmaTheta, swSigmaT, swSigma, swSoundAbsorption, swSoundSpeed, swSpecificHeat, swTFreeze, swTSrho, swThermalConductivity, swTheta, swViscosity, swZ

oce documentation built on Oct. 4, 2018, 5:04 p.m.