gsw (version 1.0-5)

gsw_rho_alpha_beta: In-situ density, thermal expansion coefficient and haline contraction coefficient (75-term equation)

Description

Calculate the in-situ density, the expansion coefficient (with respect to Conservative Temperature) and the haline contraction coefficient (with respect to Absolute Salinity), using the 75-term equation.

Usage

gsw_rho_alpha_beta(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

A list containing in-situ density rho [ kg/m^3 ], thermal expansion coefficient alpha [ 1/degC ], and haline contraction coefficient beta [ kg/g ].

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_alpha_beta.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_first_derivatives_wrt_enthalpy, gsw_rho_first_derivatives, 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_alpha_beta(SA, CT, p)
expect_equal(r$rho/1000, c(1.021839935738108, 1.022262457966867, 1.024427195413316,
                         1.027790152759127, 1.029837779000189, 1.032002453224572))
expect_equal(r$alpha*1000, c(0.324638934509245, 0.322655537959731, 0.281145723210171,
                           0.173199716344780, 0.146289673594824, 0.129414845334599))
expect_equal(r$beta*1000, c(0.717483987596135, 0.717647512290095, 0.726211643644768,
                          0.750500751749777, 0.755052064788492, 0.757050813384370))
# }