gsw_sigma0 {gsw} | R Documentation |
This uses the 75-term density equation, and returns potential density referenced to a pressure of 0 dbar, minus 1000 kg/m^3.
gsw_sigma0(SA, CT)
SA |
Absolute Salinity [ g/kg ] |
CT |
Conservative Temperature [ degC ] |
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.
potential density anomaly [ kg/m^3 ]
http://www.teos-10.org/pubs/gsw/html/gsw_sigma0.html
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_first_derivatives
,
gsw_rho_ice
, gsw_rho_t_exact
,
gsw_rho
, 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
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) sigma0 <- gsw_sigma0(SA,CT) expect_equal(sigma0, c(21.797900819337656, 22.052215404397316, 23.892985307893923, 26.667608665972011, 27.107380455119710, 27.409748977090885))