Calculate d(SA)/d(CT) for Ice Melting in near-freezing Seawater (Polynomial version)

gsw_melting_ice_equilibrium_SA_CT_ratio_poly(SA, p)

Arguments

SA: Absolute Salinity [ g/kg ]
p: sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar

Value

ratio of change in SA to change in CT [ g/kg/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 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_melting_ice_equilibrium_SA_CT_ratio_poly.html

Examples

SA <- c(   34.7118,  34.8915,  35.0256,  34.8472,  34.7366, 34.7324)
p <- c(         10,       50,      125,      250,      600,    1000)
r <- gsw_melting_ice_equilibrium_SA_CT_ratio_poly(SA, p)
stopifnot(all.equal(r, c(0.420209444587263, 0.422511664682796, 0.424345538275708,
                         0.422475965003649, 0.422023755182266, 0.423038080717229)))