gsw (version 1.0-5)

gsw_rho_first_derivatives: Density First Derivatives wrt SA, CT and p (75-term equation)

Description

Density First Derivatives wrt SA, CT and p (75-term equation)

Usage

gsw_rho_first_derivatives(SA, CT, p)

Arguments

SA

Absolute Salinity [ g/kg ]

CT

Conservative Temperature [ degC ]

p

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

Value

list containing drho_dSA [ kg^2/(g m^3) ], drho_dCT [ kg/(K m^3) ] and drho_dp [ kg/(Pa m^3) ]

Details

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.

References

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

See Also

Other things related to density: gsw_CT_from_rho, gsw_CT_maxdensity, gsw_SA_from_rho, gsw_alpha_on_beta, gsw_alpha_wrt_t_exact, gsw_alpha_wrt_t_ice, gsw_alpha, gsw_beta_const_t_exact, gsw_beta, gsw_pot_rho_t_exact, gsw_rho_alpha_beta, gsw_rho_first_derivatives_wrt_enthalpy, gsw_rho_ice, gsw_rho_t_exact, gsw_rho, gsw_sigma0, gsw_sigma1, gsw_sigma2, gsw_sigma3, gsw_sigma4, gsw_specvol_alpha_beta, gsw_specvol_anom_standard, gsw_specvol_ice, gsw_specvol_t_exact, gsw_specvol

Examples

# NOT RUN {
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_first_derivatives(SA, CT, p)
expect_equal(r$drho_dSA, c(0.733153791778356, 0.733624109867480, 0.743950957375504,
                           0.771357282286743, 0.777581141431288, 0.781278296628328))
expect_equal(r$drho_dCT, c(-0.331729027977015, -0.329838643311336, -0.288013324730644,
                           -0.178012962919839, -0.150654632545556, -0.133556437868984))
expect_equal(r$drho_dp, 1e-6*c(0.420302360738476, 0.420251070273888, 0.426773054953941,
                               0.447763615252861, 0.452011501791479, 0.454118117103094))
# }