gsw_specvol_first_derivatives {gsw} | R Documentation |
First Derivatives of Specific Volume
gsw_specvol_first_derivatives(SA, CT, p)
SA |
Absolute Salinity [ g/kg ] |
CT |
Conservative Temperature [ degC ] |
p |
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar |
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.
A list containing v_SA
[ (m^3/kg)/(g/kg) ], the derivative of
specific volume with respect to Absolute Salinity, v_CT
[ (m^3/kg)/degC],
the derivative of specific volume with respect to Conservative Temperature, and
v_p
[ (m^3/kg)/dbar ], the derivative of specific volume with respect
to pressure. (Note that the last quantity is denoted v_P
in the
documentation for the Matlab function.)
http://www.teos-10.org/pubs/gsw/html/gsw_specvol_first_derivatives.html
Other things related to enthalpy: gsw_CT_from_enthalpy
,
gsw_dynamic_enthalpy
,
gsw_enthalpy_CT_exact
,
gsw_enthalpy_diff
,
gsw_enthalpy_first_derivatives_CT_exact
,
gsw_enthalpy_first_derivatives
,
gsw_enthalpy_ice
,
gsw_enthalpy_t_exact
,
gsw_enthalpy
,
gsw_frazil_properties_potential_poly
,
gsw_frazil_properties_potential
,
gsw_pot_enthalpy_from_pt_ice_poly
,
gsw_pot_enthalpy_from_pt_ice
,
gsw_pot_enthalpy_ice_freezing_poly
,
gsw_pot_enthalpy_ice_freezing
,
gsw_pt_from_pot_enthalpy_ice_poly
,
gsw_pt_from_pot_enthalpy_ice
,
gsw_specvol_first_derivatives_wrt_enthalpy
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_first_derivatives(SA, CT, p) expect_equal(r$v_SA/1e-6, c(-0.702149096451073, -0.702018847212088, -0.708895319156155, -0.730208155560782, -0.733175729406169, -0.733574625737474)) expect_equal(r$v_CT/1e-6, c(0.317700378655437, 0.315628863649601, 0.274441877830800, 0.168516613901993, 0.142051181824820, 0.125401683814057)) expect_equal(r$v_p/1e-12, c(-0.402527990904794, -0.402146232553089, -0.406663124765787, -0.423877042622481, -0.426198431093548, -0.426390351853055))