First Derivatives of Potential Temperature
gsw_pt_first_derivatives(SA, CT)Absolute Salinity [ g/kg ]
Conservative Temperature [ degC ]
A list containing pt_SA [ K/(g/kg) ], the derivative of
potential temperature with respect to Absolute Salinity,
and pt_CT [ unitless ], the derivative of potential temperature
with respect to Conservative Temperature.
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.
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
CT <- c(28.8099, 28.4392, 22.7862, 10.2262, 6.8272, 4.3236)
r <- gsw_pt_first_derivatives(SA, CT)
stopifnot(all.equal(r$pt_SA, c(0.041863223165431, 0.041452303483011, 0.034682095247246,
0.018711079068408, 0.014079958329844, 0.010577326129948)))
stopifnot(all.equal(r$pt_CT, c(0.997192967140242, 0.997451686508335, 0.998357568277750,
0.999996224076267, 1.000283719083268, 1.000525947028218)))