gsw_pt_from_entropy | R Documentation |
Potential Temperature from Entropy
gsw_pt_from_entropy(SA, entropy)
SA |
Absolute Salinity [ g/kg ]. The valid range for most 'gsw' functions is 0 to 42 g/kg. |
entropy |
specific entropy [ J/(degC*kg) ] |
potential temperature [ degC ]
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_pt_from_entropy.html
Other things related to entropy:
gsw_CT_from_entropy()
,
gsw_entropy_first_derivatives()
,
gsw_entropy_from_pt()
,
gsw_entropy_from_t()
,
gsw_entropy_ice()
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)))
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