Calculates specific entropy in terms of Absolute Salinity, in-situ temperature and pressure.
Absolute Salinity [ g/kg ]
in-situ temperature (ITS-90) [ degC ]
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
specific entropy [ J/(kg*K) ]
This R function uses a wrapper to a C function
contained within the GSW-C system as updated 2021-03-27
with git commit 'f7bfebf44f686034636facb09852f1d5760c27f5'.
In turn, that C function uses data from the
file provided in the GSW-Matlab source code, version 3.06-11.
Unfortunately, this version 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
on 2021-0706, 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.
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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) e <- gsw_entropy_from_t(SA, t, p) stopifnot(all.equal(e/1e2, c(4.003894252787245, 3.954381784340642, 3.198664981986740, 1.467908815899072, 0.986473408657975, 0.627915087346090)))
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