oce (version 0.9-20)

swAlphaOverBeta: Ratio of seawater thermal expansion coefficient to haline contraction coefficient

Description

Compute $alpha/beta$ using McDougall's (1987) algorithm.

Usage

swAlphaOverBeta(salinity, temperature = NULL, pressure = NULL, longitude = 300, latitude = 30, eos = getOption("oceEOS", default = "gsw"))

Arguments

salinity

either practical salinity (in which case temperature and pressure must be provided) or an oce object (in which case salinity, etc. are inferred from the object).

temperature

in-situ temperature [$deg$C]

pressure

pressure [dbar]

longitude

longitude of observation (only used if eos="gsw"; see ‘Details’).

latitude

latitude of observation (only used if eos="gsw"; see ‘Details’).

eos

equation of state, either "unesco" or "gsw".

Value

Value in psu/$deg$C.

References

The eos="unesco" formulae are based on the UNESCO equation of state, but are formulaed empirically by Trevor J. McDougall, 1987, Neutral Surfaces, Journal of Physical Oceanography, volume 17, pages 1950-1964. The eos="gsw" formulae come from GSW; see references in the swRho documentation.

See Also

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

Examples

swAlphaOverBeta(40, 10, 4000, eos="unesco") # 0.3476