Pressure at which Seawater Freezes

Usage

gsw_pressure_freezing_CT(SA, CT, saturation_fraction = 1)

Arguments

SA: Absolute Salinity [ g/kg ]. The valid range for most `gsw` functions is 0 to 42 g/kg.
CT: Conservative Temperature [ degC ].
saturation_fraction: fraction of air in water [unitless]

Value

pressure at which freezing will occur [ dbar ]

Implementation Note

This R function uses a wrapper to a C function contained within the GSW-C system as updated 2022-10-11 at https://github.com/TEOS-10/GSW-C with git commit `657216dd4f5ea079b5f0e021a4163e2d26893371`.

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_pressure_freezing_CT.html

Examples

SA <- c(                 34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
CT <- c(                 -1.8996, -1.9407, -2.0062, -2.0923, -2.3593, -2.6771)
saturation_fraction <- c(       1,    0.8,     0.6,     0.5,     0.4,       0)
p <- gsw_pressure_freezing_CT(SA, CT, saturation_fraction)
stopifnot(all.equal(p/1e3, c(0.009890530270710, 0.050376026585933, 0.125933117050624,
                             0.251150973076077, 0.601441775836021, 1.002273338145043)))