sw.conductivity {oce} | R Documentation |
Compute seawater conductivity, in W/(m*degC)
sw.conductivity(S, t=NULL, p=NULL)
S |
salinity [PSU], or a ctd object, in which case
t and p will be ignored. |
t |
in-situ temperature [degC] |
p |
pressure [dbar] |
If the first item is ctd
object, then the salinity,
temperature and pressure values will be extracted from it, and used
to for 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.
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, Deep-sea Research, 21, 131-137.
Fofonoff, N. P., 1962. Physical properties of sea-water, The Sea, 1, 3-30.
library(oce) cond <- sw.conductivity(10,35,100); # 0.618569 diffusivity <- cond / (sw.rho(10,35,100) * sw.specific.heat(10,35,100))