gsw (version 1.2-0)

gsw_specvol_alpha_beta: Specific Volume, alpha, and beta

Description

Specific Volume, alpha, and beta

Usage

gsw_specvol_alpha_beta(SA, CT, p)

Value

a list holding specvol, the specific volume [ m^3/kg ], alpha, the thermal expansion coefficient [ 1/degC ], and beta, the haline contraction coefficient [ kg/g ].

Arguments

SA

Absolute Salinity [ g/kg ]. The valid range for most `gsw` functions is 0 to 42 g/kg.

CT

Conservative Temperature [ degC ].

p

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

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.

References

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

See Also

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

Examples

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_specvol_alpha_beta(SA, CT, p)
stopifnot(all.equal(r$specvol/1e-3, c(0.978626852431313, 0.978222365701325, 0.976155264597929,
                                      0.972961258011157, 0.971026719344908, 0.968989944622149)))
stopifnot(all.equal(r$alpha/1e-3, c(0.324638934509245, 0.322655537959731, 0.281145723210171,
                                    0.173199716344780, 0.146289673594824, 0.129414845334599)))
stopifnot(all.equal(r$beta/1e-3, c(0.717483987596135, 0.717647512290095, 0.726211643644768,
                                   0.750500751749777, 0.755052064788492, 0.757050813384370)))