gsw (version 1.2-0)

gsw_enthalpy_first_derivatives: First Derivatives of Enthalpy

Description

First Derivatives of Enthalpy

Usage

gsw_enthalpy_first_derivatives(SA, CT, p)

Value

a list containing h_SA [ (J/kg)/(g/kg) ], the derivative of enthalpy wrt Absolute Salinity, and h_CT [ (J/kg)/degC ], the derivative of enthalpy wrt Conservative Temperature.

Arguments

SA

Absolute Salinity [ g/kg ]. The valid range for most `gsw` functions is 0 to 42 g/kg.

CT

Conservative Temperature [ degC ].

p

sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar

Implementation Note

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.

References

http://www.teos-10.org/pubs/gsw/html/gsw_enthalpy_first_derivatives.html

See Also

Other things related to enthalpy: gsw_CT_from_enthalpy(), gsw_dynamic_enthalpy(), gsw_enthalpy(), gsw_enthalpy_CT_exact(), gsw_enthalpy_diff(), gsw_enthalpy_first_derivatives_CT_exact(), gsw_enthalpy_ice(), gsw_enthalpy_t_exact(), gsw_frazil_properties_potential(), gsw_frazil_properties_potential_poly(), gsw_pot_enthalpy_from_pt_ice(), gsw_pot_enthalpy_from_pt_ice_poly(), gsw_pot_enthalpy_ice_freezing(), gsw_pot_enthalpy_ice_freezing_poly(), gsw_pt_from_pot_enthalpy_ice(), gsw_pt_from_pot_enthalpy_ice_poly(), gsw_specvol_first_derivatives(), gsw_specvol_first_derivatives_wrt_enthalpy()

Examples

SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
CT <- c(28.7856, 28.4329, 22.8103, 10.2600,  6.8863,  4.4036)
p <-  c(     10,      50,     125,     250,     600,    1000)
d <- gsw_enthalpy_first_derivatives(SA, CT, p)
stopifnot(all.equal(d$h_SA, c(-0.070223912348929, -0.351159768365102, -0.887025065692568,
                              -1.829602387915694, -4.423463748270238, -7.405100077558673)))
stopifnot(all.equal(d$h_CT/1e3, c(3.991899705530481, 3.992025640520101, 3.992210365030743,
                                  3.992284150250490, 3.992685389122658, 3.993014168534175)))