swConductivity(salinity, temperature=NULL, pressure=NULL)
ctd
object, in which case
temperature
and pressure
will be ignored.To calculate thermal diffusivity in $m^2/s$, divide by the product of density and specific heat, as in the example.
ctd
object, then the salinity, temperature
and pressure values will be extracted from it, and used in the calculation.Note that this is provisional code only!
To do: Fill in a summary of Caldwell's technique.
To do: Compare this with Caldwell's stated uncertainty.
Caution. The results differ from Fofonoff's (1962) table 5 by 0.1 percent at 35PSU, and by under 1 percent for fresh water.
Fofonoff, N. P., 1962. Physical properties of sea-water, The Sea, 1, 3-30.
library(oce)
cond <- swConductivity(10,35,100); # 0.618569
diffusivity <- cond / (swRho(10,35,100) * swSpecificHeat(10,35,100))
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