gsw_C_from_SP: Electrical Conductivity from Practical Salinity

View source: R/gsw.R

gsw_C_from_SPR Documentation

Electrical Conductivity from Practical Salinity


Electrical conductivity (in mS/cm) from Practical Salinity. To convert the return value to conductivity ratio, divide by 42.9140 (the value of conductivity at S=35, T68=15, and p=0).


gsw_C_from_SP(SP, t, p)



Practical Salinity (PSS-78) [ unitless ]


in-situ temperature (ITS-90) [ degC ]


sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar


electrical conductivity [ mS/cm ]

Implementation Note

This R function uses a wrapper to a C function contained within the GSW-C system as updated 2021-12-28 at 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 website. Therefore, in the interests of making GSW-R be self-contained, a copy was downloaded from on 2022-05-25, the .mat file was stored in the developer/create_data directory of, and then the dataset used in GSW-R was created based on that .mat file.

Please consult to learn more about the various TEOS-10 software systems.


See Also

Other things related to salinity: gsw_SA_from_SP_Baltic(), gsw_SA_from_SP(), gsw_SA_from_Sstar(), gsw_SP_from_C(), 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_SP_from_C()


SP <- 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)
C <- gsw_C_from_SP(SP, t, p)
stopifnot(all.equal(C, c(56.412599581571186, 56.316185602699953, 50.670369333973944,
                         38.134518936104350, 35.056577637635257, 32.986550607990118)))

gsw documentation built on Oct. 16, 2022, 5:06 p.m.