gsw (version 1.2-0)

gsw_t_deriv_chem_potential_water_t_exact: Derivative of Chemical Potential of Water in Seawater wrt Temperature

Description

Derivative of Chemical Potential of Water in Seawater wrt Temperature

Usage

gsw_t_deriv_chem_potential_water_t_exact(SA, t, p)

Value

derivative [ J/(g*degC) ]

Arguments

SA

Absolute Salinity [ g/kg ]. The valid range for most `gsw` functions is 0 to 42 g/kg.

t

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

p

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

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_t_deriv_chem_potential_water_t_exact.html

Examples

SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
t <- c( 28.7856, 28.4329, 22.8103, 10.2600,  6.8863,  4.4036)
p <- c(      10,      50,     125,     250,     600,    1000)
d <- gsw_t_deriv_chem_potential_water_t_exact(SA, t, p)
stopifnot(all.equal(d, c(-0.428798278908442, -0.423860344327343, -0.345277821010421,
                         -0.164446485487145, -0.114228046736087, -0.076990819658255)))