First Derivatives of Entropy
Absolute Salinity [ g/kg ]
Conservative Temperature [ degC ]
a list containing
eta_SA [ (J/(kg*degC) / (g/kg) ],
the derivative of entropy wrt Absolute Salinity, and
eta_CT [ (J/(kg*degC^2) ],
the derivative of entropy wrt Conservative Temperature.
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) CT <- c(28.8099, 28.4392, 22.7862, 10.2262, 6.8272, 4.3236) d <- gsw_entropy_first_derivatives(SA, CT) stopifnot(all.equal(d$eta_SA, c(-0.263286800711655, -0.263977276574528, -0.255367497912925, -0.238066586439561, -0.234438260606436, -0.232820684341694))) stopifnot(all.equal(d$eta_CT, c(13.221031210083824, 13.236911191313675, 13.489004628681361, 14.086599016583795, 14.257729576432077, 14.386429945649411)))
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