Compute Absolute Salinity at Freezing in-situ Temperature (Polynomial version)

gsw_SA_freezing_from_t_poly(t, p, saturation_fraction = 1)

Arguments

t: in-situ temperature (ITS-90) [ degC ]
p: sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
saturation_fraction: fraction of air in water [unitless]

Value

Absolute Salinity [ g/kg ]

Implementation Note

This R function uses a wrapper to a C function contained within the GSW-C system as updated 2021-12-28 at https://github.com/TEOS-10/GSW-C with git commit `98f0fd40dd9ceb0ba82c9d47ac750e935a7d0459`.

The C function uses data from the library/gsw_data_v3_0.mat file provided in the GSW-Matlab source code, version 3.06-11. Unfortunately, this version of the mat file is no longer displayed on the TEOS-10.org website. Therefore, in the interests of making GSW-R be self-contained, a copy was downloaded from http://www.teos-10.org/software/gsw_matlab_v3_06_11.zip on 2022-05-25, the .mat file was stored in the developer/create_data directory of https://github.com/TEOS-10/GSW-R, and then the dataset used in GSW-R was created based on that .mat file.

Please consult http://www.teos-10.org to learn more about the various TEOS-10 software systems.

References

http://www.teos-10.org/pubs/gsw/html/gsw_SA_freezing_from_t_poly.html

Examples

t <- c(-0.11901, -0.15608, -0.72138, -1.97738, -2.31728, -2.56764)
p <- c(      10,       50,      125,      250,      600,     1000)
saturation_fraction <- 1
SA <- gsw_SA_freezing_from_t_poly(t, p, saturation_fraction)
stopifnot(all.equal(SA, c(2.017072489768256, 2.151989342038462, 11.677649626115608,
                          32.843128114999026, 34.136459306273451, 33.097427522625182)))