gsw_entropy_from_t | R Documentation |
Calculates specific entropy in terms of Absolute Salinity, in-situ temperature and pressure.
gsw_entropy_from_t(SA, t, p)
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 |
specific entropy [ J/(kg*K) ]
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.
http://www.teos-10.org/pubs/gsw/html/gsw_entropy_from_t.html
Other things related to entropy:
gsw_CT_from_entropy()
,
gsw_entropy_first_derivatives()
,
gsw_entropy_from_pt()
,
gsw_entropy_ice()
,
gsw_pt_from_entropy()
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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