First Derivatives of Potential Enthalpy
First Derivatives of Potential Enthalpy
gsw_pot_enthalpy_ice_freezing_first_derivatives(SA, p)
SA |
Absolute Salinity [ g/kg ] |
p |
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar |
The present R function works with a wrapper to a C function contained within the GSW-C system (Version 3.05-4 dated 2017-08-07, available at https://github.com/TEOS-10/GSW-C, as git commit '5b4d959e54031f9e972f3e863f63e67fa4f5bfec'), which stems from the GSW-Fortran system (https://github.com/TEOS-10/GSW-Fortran) which in turn stems from the GSW-Matlab system (https://github.com/TEOS-10/GSW-Matlab). Consult http://www.teos-10.org to learn more about these software systems, their authorships, and the science behind it all.
A list containing pot_enthalpy_ice_freezing_SA [ (J/kg)/(g/kg) ], the derivative of
potential enthalpy with respect to Absolute Salinity,
and pot_enthalpy_ice_freezing_p [ unitless ], the derivative of
Conservative Temperature with respect to potential temperature. (Note that the second
quantity is denoted pot_enthalpy_ice_freezing_P in the documentation for the Matlab function.)
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
p <- c( 10, 50, 125, 250, 600, 1000)
r <- gsw_pot_enthalpy_ice_freezing_first_derivatives(SA, p)
expect_equal(r$pot_enthalpy_ice_freezing_SA/1e2,
c(-1.183484968590718, -1.184125268891200, -1.184619267864844,
-1.184026131143674, -1.183727706650925, -1.183814873741961))
expect_equal(r$pot_enthalpy_ice_freezing_p/1e-3,
c(-0.202880939983260, -0.203087335312542, -0.203473018454630,
-0.204112435106666, -0.205889571619502, -0.207895691215823))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.