gsw_SP_from_C function

Convert from Electrical Conductivity to Practical Salinity

gsw_SP_from_C(C, t, p)

Arguments

• C: conductivity [ mS/cm ]
• t: in-situ temperature (ITS-90) [ degC ]
• p: sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar

Returns

Practical Salinity (PSS-78) [ unitless ]

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.

Examples

C <- c(34.5487, 34.7275, 34.8605, 34.6810, 34.5680, 34.5600)
t <- c(28.7856, 28.4329, 22.8103, 10.2600,  6.8863,  4.4036)
p <- c(     10,      50,     125,     250,     600,    1000)
SP <- gsw_SP_from_C(C,t,p)
stopifnot(all.equal(SP,  c(20.009869599086951, 20.265511864874270, 22.981513062527689,
                           31.204503263727982, 34.032315787432829, 36.400308494388170)))

References

http://www.teos-10.org/pubs/gsw/html/gsw_SP_from_C.html

See Also

Other things related to salinity: gsw_C_from_SP(), gsw_SA_from_SP(), gsw_SA_from_SP_Baltic(), gsw_SA_from_Sstar(), gsw_SP_from_SA(), gsw_SP_from_SK(), gsw_SP_from_SR(), gsw_SP_from_Sstar(), gsw_SR_from_SP(), gsw_Sstar_from_SA(), gsw_Sstar_from_SP(), gsw_deltaSA_from_SP()

Other things related to conductivity: gsw_C_from_SP()