gsw_enthalpy_diff function

Specific Enthalpy Difference with Pressure

Specific enthalpy difference [ J/kg ].

gsw_enthalpy_diff(SA, CT, p_shallow, p_deep)

Arguments

• SA: Absolute Salinity [ g/kg ]. The valid range for most gsw functions is 0 to 42 g/kg.
• CT: Conservative Temperature [ degC ].
• p_shallow: pressure at a shallower depth [ dbar ]
• p_deep: pressure at a deeper depth [ dbar ]

Returns

specific enthalpy difference [ J/kg ]

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.

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_shallow <- c(10,      50,     125,     250,     600,    1000)
p_deep <- c(  110,     150,     225,     350,     700,    1100)
ed <- gsw_enthalpy_diff(SA, CT, p_shallow, p_deep)
stopifnot(all.equal(ed/1e2, c(9.784180644568052, 9.780195056105020, 9.759587700515114,
                              9.727552719534447, 9.708223170174454, 9.687871289079633)))

References

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

See Also

Other things related to enthalpy: gsw_CT_from_enthalpy(), gsw_dynamic_enthalpy(), gsw_enthalpy(), gsw_enthalpy_CT_exact(), gsw_enthalpy_first_derivatives(), 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()