This uses the C function named
gsw_t_freezing_exact, because the
C function named
gsw_t_freezing does not produce check values that
match the Matlab function called
gsw_t_freezing (see references
for those test values).
gsw_t_freezing(SA, p, saturation_fraction = 1)
Absolute Salinity [ g/kg ]
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
fraction of air in water [unitless]
The present R function works with a wrapper to a C function contained within the GSW-C system (Version 3.05-4 dated 2017-08-07, available at https://github.com/TEOS-10/GSW-C, as git commit '5b4d959e54031f9e972f3e863f63e67fa4f5bfec'), which stems from the GSW-Fortran system (https://github.com/TEOS-10/GSW-Fortran) which in turn stems from the GSW-Matlab system (https://github.com/TEOS-10/GSW-Matlab). Consult http://www.teos-10.org to learn more about these software systems, their authorships, and the science behind it all.
in-situ freezing temperature (ITS-90) [ degC ]
1 2 3 4 5 6
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324) p <- c( 10, 50, 125, 250, 600, 1000) saturation_fraction <- 1 tf <- gsw_t_freezing(SA, p, saturation_fraction) expect_equal(tf, c(-1.902730710149803, -1.942908619287183, -2.006861069199743, -2.090985086875259, -2.351293130342102, -2.660498762776720))
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