gsw (version 1.2-0)

gsw_pt_from_entropy: Potential Temperature from Entropy

Description

Potential Temperature from Entropy

Usage

gsw_pt_from_entropy(SA, entropy)

Value

potential temperature [ degC ]

Arguments

SA

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

entropy

specific entropy [ J/(degC*kg) ]

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_pt_from_entropy.html

See Also

Other things related to entropy: gsw_CT_from_entropy(), gsw_entropy_first_derivatives(), gsw_entropy_from_pt(), gsw_entropy_from_t(), gsw_entropy_ice()

Examples

SA <- c(      34.7118,  34.8915,  35.0256,  34.8472, 34.7366, 34.7324)
entropy <- c(400.3892, 395.4378, 319.8668, 146.7910, 98.6471, 62.7919)
pt <- gsw_pt_from_entropy(SA, entropy)
stopifnot(all.equal(pt, c(28.783179828078666, 28.420954825949291, 22.784952736245351,
                          10.230532066931868, 6.829213325916900, 4.324537782985845)))