oce (version 0.9-20)

swLapseRate: Seawater lapse rate

Description

Compute adiabatic lapse rate

Usage

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

Arguments

salinity

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).

temperature

in-situ temperature [$deg$C], defined on the ITS-90 scale; see “Temperature units” in the documentation for swRho.

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" [1,2] or "gsw" [3,4].

Value

Lapse rate [$deg$C/m].

Details

If eos="unesco", the density is calculated using the UNESCO equation of state for seawater [1,2], and if eos="gsw", the GSW formulation [3,4] is used.

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. (Section 7, pages 38-40)

See Also

Other functions that calculate seawater properties: T68fromT90, T90fromT48, T90fromT68, swAbsoluteSalinity, swAlphaOverBeta, swAlpha, swBeta, swCSTp, swConservativeTemperature, swDepth, swDynamicHeight, 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

lr <- swLapseRate(40, 40, 10000) # 3.255976e-4