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

Usage

gsw_melting_ice_SA_CT_ratio_poly(SA, CT, p, t_Ih)

Arguments

SA: Absolute Salinity [ g/kg ]. The valid range for most `gsw` functions is 0 to 42 g/kg.
CT: Conservative Temperature [ degC ].
p: sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
t_Ih: initial temperature of ice [ degC ]

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 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_melting_ice_SA_CT_ratio_poly.html

Examples

SA <- c(   34.7118,  34.8915,  35.0256,  34.8472,  34.7366, 34.7324)
CT <- c(    3.7856,   3.4329,   2.8103,   1.2600,   0.6886,  0.4403)
p <- c(         10,       50,      125,      250,      600,    1000)
t_Ih <- c(-10.7856, -13.4329, -12.8103, -12.2600, -10.8863, -8.4036)
r <- gsw_melting_ice_SA_CT_ratio_poly(SA, CT, p, t_Ih)
stopifnot(all.equal(r, c(0.373840908629278, 0.371878512745054, 0.377104658031030,
                         0.382777681212224, 0.387133812279563, 0.393947267481204)))