Description Usage Arguments Details Value Author(s) References See Also Examples
Compute seawater thermal conductivity, in W/(m*degC)
1  swThermalConductivity(salinity, temperature = NULL, pressure = NULL)

salinity 
salinity [PSU], or a 
temperature 
insitu temperature [degC], defined
on the ITS90 scale; see “Temperature units” in the documentation for

pressure 
pressure [dbar] 
Caldwell's (1974) detailed formulation is used. To be specific, his equation 6 to calculate K, and his two sentences above that equation are used to infer this to be K(0,T,S) in his notation of equation 7. Then, application of his equations 7 and 8 is straightforward. He states an accuracy for this method of 0.3 percent. (See the check against his Table 1 in the “Examples”.)
Conductivity of seawater in W/(m*degC).
To calculate thermal diffusivity in m^2/s, divide by the product of density and specific heat, as in the example.
Dan Kelley
Caldwell, Douglas R., 1974. Thermal conductivity of seawater, Deepsea Research, 21, 131137.
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
,
swSpice
, swTFreeze
,
swTSrho
, swTheta
,
swViscosity
, swZ
1 2 3 4 5 6 7 8  library(oce)
# Values in m^2/s, a unit that is often used instead of W/(m*degC).
swThermalConductivity(35, 10, 100) / (swRho(35,10,100) * swSpecificHeat(35,10,100)) # ocean
swThermalConductivity(0, 20, 0) / (swRho(0, 20, 0) * swSpecificHeat(0, 20, 0)) # lab
# Caldwell Table 1 gives 1478e6 cal/(cm*sec*degC) at 31.5 o/oo, 10degC, 1kbar
joulePerCalorie < 4.18400
cmPerM < 100
swThermalConductivity(31.5,10,1000) / joulePerCalorie / cmPerM

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