gsw_entropy_ice: Entropy of ice

View source: R/gsw.R

gsw_entropy_iceR Documentation

Entropy of ice


Entropy of ice


gsw_entropy_ice(t, p)



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


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


entropy [ J/(kg*degC) ]

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 entropy: gsw_CT_from_entropy(), gsw_entropy_first_derivatives(), gsw_entropy_from_pt(), gsw_entropy_from_t(), gsw_pt_from_entropy()


t <- c(-10.7856, -13.4329, -12.8103, -12.2600,  -10.8863,  -8.4036)
p <- c(      10,       50,      125,      250,      600,      1000)
e <- gsw_entropy_ice(t, p)
stopifnot(all.equal(e/1e3, c(-1.303663820598987, -1.324090218294577, -1.319426394193644,
                             -1.315402956671801, -1.305426590579231, -1.287021035328113)))

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