Compute Absolute Salinity at Freezing Point (Polynomial version)

Usage

gsw_SA_freezing_from_CT_poly(CT, p, saturation_fraction = 1)

Arguments

CT: Conservative Temperature [ 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 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_SA_freezing_from_CT_poly.html

Examples

CT <- 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_CT_poly(CT, p, saturation_fraction)
stopifnot(all.equal(SA, c(2.281810267792954, 2.418134292641376, 11.971996354752958,
                          32.867931280363138, 34.015087798162732, 32.856434894818825)))