gsw_alpha_wrt_t_exact: Thermal expansion coefficient with respect to in-situ...

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gsw_alpha_wrt_t_exactR Documentation

Thermal expansion coefficient with respect to in-situ temperature


Thermal expansion coefficient with respect to in-situ temperature.


gsw_alpha_wrt_t_exact(SA, t, p)



Absolute Salinity [ g/kg ]


in-situ temperature (ITS-90) [ degC ]


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


thermal expansion coefficient with respect to in-situ temperature [ 1/K ]

Implementation Note

This R function uses a wrapper to a C function contained within the GSW-C system as updated 2021-12-28 at with git commit '98f0fd40dd9ceb0ba82c9d47ac750e935a7d0459'.

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 website. Therefore, in the interests of making GSW-R be self-contained, a copy was downloaded from on 2022-05-25, the .mat file was stored in the developer/create_data directory of, and then the dataset used in GSW-R was created based on that .mat file.

Please consult to learn more about the various TEOS-10 software systems.


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_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_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()


SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
t <-  c(28.7856, 28.4329, 22.8103, 10.2600,  6.8863,  4.4036)
p <-  c(     10,      50,     125,     250,     600,    1000)
alpha_wrt_t_exact <- gsw_alpha_wrt_t_exact(SA,t,p)
    c(0.325601747227247, 0.323448083851267, 0.281413883319329,
    0.172825692975230, 0.145569941503599, 0.128362986933288)))

gsw documentation built on Oct. 16, 2022, 5:06 p.m.