gsw_enthalpy_second_derivatives {gsw} | R Documentation |
Second Derivatives of Enthalpy
gsw_enthalpy_second_derivatives(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 |
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 h_SA_SA
[ (J/kg)/(g/kg)^2 ], the second derivative of
enthalpy with respect to Absolute Salinity, h_SA_CT
[ (J/kg)/(K*g/kg) ], the derivative of
enthalpy with respect to Absolute Salinity and Conservative Temperature,
and h_CT_CT
[ (J/kg)/degC^2 ], the second derivative of
enthalpy with respect to Conservative Temperature.
http://www.teos-10.org/pubs/gsw/html/gsw_enthalpy_second_derivatives.html
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) r <- gsw_enthalpy_second_derivatives(SA, CT, p) expect_equal(r$h_SA_SA, c(0.000080922482023, 0.000404963500641, 0.001059800046742, 0.002431088963823, 0.006019611828423, 0.010225411250217)) expect_equal(r$h_SA_CT, c(0.000130004715129, 0.000653614489248, 0.001877220817849, 0.005470392103793, 0.014314756132297, 0.025195603327700)) expect_equal(r$h_CT_CT, c(0.000714303909834, 0.003584401249266, 0.009718730753139, 0.024064471995224, 0.061547884081343, 0.107493969308119))