gsw_rho_second_derivatives_wrt_enthalpy | R Documentation |
Second Derivatives of Density wrt Enthalpy
gsw_rho_second_derivatives_wrt_enthalpy(SA, CT, p)
SA |
Absolute Salinity [ g/kg ] |
CT |
Conservative Temperature [ degC ] |
p |
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar |
A list containing rho_SA_SA
[ (kg/m^3)/(g/kg)^2 ], the second derivative of
density with respect to Absolute Salinity,
rho_SA_h
[ (g/kg)/(g/kg)/(J/kg)], the derivative of
density with respect to Absolute Salinity and enthalpy,
and rho_h_h
[ (kg/m^3)/(J/kg)^2 ], the second derivative of
density with respect to enthalpy.
This R function uses a wrapper to a C function contained within the GSW-C system as updated 2021-12-28 at https://github.com/TEOS-10/GSW-C 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
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_rho_second_derivatives_wrt_enthalpy.html
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) p <- c( 10, 50, 125, 250, 600, 1000) r <- gsw_rho_second_derivatives_wrt_enthalpy(SA, CT, p) stopifnot(all.equal(r$rho_SA_SA/1e-3, c(0.207325714908677, 0.207131960039965, 0.192001360206293, 0.133399974356615, 0.116504845152129, 0.103433221305694))) stopifnot(all.equal(r$rho_SA_h/1e-6, c(-0.459053080088382, -0.460370569872258, -0.498605615416296, -0.642833108550133, -0.682091962941161, -0.706793055445909))) stopifnot(all.equal(r$rho_h_h/1e-9, c(-0.454213854637790, -0.455984900239309, -0.499870030989387, -0.628337767293403, -0.664021595759308, -0.687367088752173)))
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