gsw_CT_freezing_poly: Conservative Temperature Freezing Point (Polynomial version)

View source: R/gsw.R

gsw_CT_freezing_polyR Documentation

Conservative Temperature Freezing Point (Polynomial version)


Conservative Temperature Freezing Point (Polynomial version)


gsw_CT_freezing_poly(SA, p, saturation_fraction = 1)



Absolute Salinity [ g/kg ]


sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar


saturation fraction of dissolved air in seawater


Conservative Temperature at freezing of seawater [ degC ].

Implementation Note

This R function uses a wrapper to a C function contained within the GSW-C system as updated 2021-12-28 at 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 website. Therefore, in the interests of making GSW-R be self-contained, a copy was downloaded from on 2022-05-25, the .mat file was stored in the developer/create_data directory of, and then the dataset used in GSW-R was created based on that .mat file.

Please consult to learn more about the various TEOS-10 software systems.



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
CT_freezing <- gsw_CT_freezing(SA, p, saturation_fraction)
stopifnot(all.equal(CT_freezing, c(-1.899683776424096, -1.940791867869104, -2.006240664432488,
                                   -2.092357761318778, -2.359300831770506, -2.677162675412748)))

gsw documentation built on Oct. 16, 2022, 5:06 p.m.