The Gibbs SeaWater (GSW) Oceanographic Toolbox of TEOS-10
Contents
- Absolute Salinity (SA) and Preformed Salinity (Sstar)
- Conservative Temperature (CT)
- other conversions between temperatures, salinities, pressure and height
- density and enthalpy, based on the 25-term expression for density
- water column properties, based on the 25-term expression for density
- geostrophic streamfunctions, based on the 25-term expression for density
- neutral and non-linear properties, based on the 25-term expression for density
- basic thermodynamic properties in terms of (SA, t, p)
- basic thermodynamic properties in terms of CT and pt
- derivatives of enthalpy, entropy, CT and pt
- Planet Earth properties
- functions for laboratory use
- Front page, contents and check values of the GSW Oceanographic Toolbox
- Practical Salinity (SP), PSS-78
- Library functions of the GSW toolbox (internal functions; not intended to be called by users)
- Licences and third party software
Absolute Salinity (SA) and Preformed Salinity (Sstar)
gsw_SA_from_SP Absolute Salinity from Practical Salinity
gsw_Sstar_from_SP Preformed Salinity from Practical Salinity
gsw_SA_Sstar_from_SP Absolute Salinity & Preformed Salinity from Practical Salinity
Conservative Temperature (CT)
gsw_CT_from_t Conservative Temperature from in-situ temperature
other conversions between temperatures, salinities, pressure and height
gsw_t_from_CT in-situ temperature from Conservative Temperature
gsw_pt_from_t potential temperature
gsw_CT_from_pt Conservative Temperature from potential temperature
gsw_pot_enthalpy_from_pt potential enthalpy from potential temperature
gsw_pt0_from_t potential temperature with a reference pressure of zero dbar
gsw_pt_from_CT potential temperature from Conservative Temperature
gsw_SP_from_SA Practical Salinity from Absolute Salinity
gsw_Sstar_from_SA Preformed Salinity from Absolute Salinity
gsw_SA_from_Sstar Absolute Salinity from Preformed Salinity
gsw_SP_from_Sstar Practical Salinity from Preformed Salinity
gsw_z_from_p height from pressure
gsw_p_from_z pressure from height
gsw_t90_from_t48 ITS-90 temperature from IPTS-48 temperature
gsw_t90_from_t68 ITS-90 temperature from IPTS-68 temperature
density and enthalpy, based on the 25-term expression for density
gsw_rho_CT25 in-situ density
gsw_rho_alpha_beta_CT25 in-situ density, thermal expansion &
saline contraction coefficient
gsw_specvol_CT25 specific volume
gsw_specvol_anom_CT25 specific volume anomaly
gsw_enthalpy_CT25 enthalpy
gsw_enthalpy_diff_CT25 difference of enthalpy between two pressures
water column properties, based on the 25-term expression for density
gsw_Nsquared_CT25 buoyancy (Brunt-Vaisala) frequency squared (N^2)
gsw_Turner_Rsubrho_CT25 Turner angle & Rsubrho
gsw_IPV_vs_fNsquared_ratio_CT25 ratio of the vertical gradient of potential density
(with reference pressure, pr), to the vertical gradient
of locally-referenced potential density
geostrophic streamfunctions, based on the 25-term expression for density
gsw_geo_strf_dyn_height dynamic height anomaly
gsw_geo_strf_dyn_height_pc dynamic height anomaly for piecewise constant profiles
gsw_geo_strf_McD_Klocker McDougall-Klocker geostrophic streamfunction
gsw_geof_str_McD_Klocker_pc McDougall-Klocker geostrophic streamfunction for
piecewise constant profiles
gsw_geo_strf_Montgomery Montgomery geostrophic streamfunction
gsw_geo_strf_Cunningham Cunningham geostrophic streamfunction
gsw_geostrophic_velocity geostrophic velocity
neutral and non-linear properties, based on the 25-term expression for density
gsw_cabbeling_CT25 cabbeling coefficient
gsw_thermobaric_CT25 thermobaric coefficient
gsw_isopycnal_slope_ratio_CT25 ratio of the slopes of isopycnals on the SA-CT diagram
for p & pr
gsw_isopycnal_vs_ntp_CT_ratio_CT25 ratio of the gradient of Conservative Temperature
in a potential density surface to that in the neutral
tangent plane
gsw_ntp_pt_vs_CT_ratio_CT25 ratio of gradients of potential temperature &
Conservative Temperature in a neutral tangent plane
(i.e. in a locally-referenced potential density surface)
basic thermodynamic properties in terms of (SA, t, p)
gsw_rho in-situ density
gsw_pot_rho potential density
gsw_specvol specific volume
gsw_specvol_anom specific volume anomaly
gsw_alpha_wrt_CT thermal expansion coefficient with respect to Conservative Temperature.
gsw_alpha_wrt_pt thermal expansion coefficient with respect to potential temperature
gsw_alpha_wrt_t thermal expansion coefficient with respect to in-situ temperature
gsw_beta_const_CT saline contraction coefficient at constant Conservative Temperature.
gsw_beta_const_pt saline contraction coefficient at constant potential temperature
gsw_beta_const_t saline contraction coefficient at constant in-situ temperature
gsw_entropy entropy
gsw_internal_energy internal energy
gsw_enthalpy enthalpy
gsw_cp isobaric heat capacity
gsw_isochoric_heat_cap isochoric heat capacity
gsw_chem_potential_relative relative chemical potential
gsw_chem_potential_water chemical potential of water in seawater
gsw_chem_potential_salt chemical potential of salt in seawater
gsw_Helmholtz_energy Helmholtz energy
gsw_sound_speed sound speed
gsw_kappa isentropic compressibility
gsw_kappa_const_t isothermal compressibility
gsw_adiabatic_lapse_rate adiabatic lapse rate
gsw_molality molality of seawater
gsw_ionic_strength ionic strength of seawater
gsw_osmotic_coefficient osmotic coefficient of seawater
gsw_temps_maxdensity temperatures of maximum density of seawater
basic thermodynamic properties in terms of CT and pt
gsw_rho_CT in-situ density from CT
gsw_rho_alpha_beta_CT in-situ density, thermal expansion & saline contraction coefficient from CT
gsw_specvol_CT specific volume from CT
gsw_specvol_anom_CT specific volume anomaly from CT
gsw_sigma0_CT sigma0 in terms of SA & CT with reference pressure of 0 dbar
gsw_sigma1_CT sigma1 in terms of SA & CT with reference pressure of 1000 dbar
gsw_sigma2_CT sigma2 in terms of SA & CT with reference pressure of 2000 dbar
gsw_sigma3_CT sigma3 in terms of SA & CT with reference pressure of 3000 dbar
gsw_sigma4_CT sigma4 in terms of SA & CT with reference pressure of 4000 dbar
gsw_enthalpy_CT enthalpy from CT
gsw_enthalpy_diff_CT difference of enthalpy from CT between two pressures
gsw_entropy_from_pt entropy from potential temperature
gsw_entropy_from_CT entropy from Conservative Temperature
gsw_pt_from_entropy potential temperature from entropy
gsw_CT_from_entropy Conservative Temperature from entropy
derivatives of enthalpy, entropy, CT and pt
gsw_CT_first_derivatives first derivatives of Conservative Temperature
gsw_CT_second_derivatives second derivatives of Conservative Temperature
gsw_enthalpy_first_derivatives first derivatives of enthalpy
gsw_enthalpy_second_derivatives second derivatives of enthalpy
gsw_entropy_first_derivatives first derivatives of entropy
gsw_entropy_second_derivatives second derivatives of entropy
gsw_pt_first_derivatives first derivatives of potential temperature
gsw_pt_second_derivatives second derivatives of potential temperature
Planet Earth properties
gsw_f Coriolis parameter (f)
gsw_grav Gravitational acceleration
gsw_distance spherical earth distance between points
in long, lat coordinates at a given pressure
functions for laboratory use
gsw_SA_from_rho Absolute Salinity from density measurements
gsw_sigma0_pt sigma_0 expressed in terms of SA & pt0 with reference pressure of 0 dbar
Practical Salinity (SP), PSS-78
gsw_SP_from_cndr Practical Salinity from conductivity ratio
gsw_cndr_from_SP conductivity ratio from Practical Salinity
Front page, contents and check values of the GSW Oceanographic Toolbox
gsw_introduction front page to the GSW Oceanographic Toolbox
gsw_check_functions checks that all the GSW functions work correctly
Library functions of the GSW toolbox (internal functions; not intended to be called by users)
The GSW functions above call the following library functions.
gsw_gibbs the TEOS-10 Gibbs function and its derivatives
gsw_delta_SA Absolute Salinity Anomaly (excluding the Baltic Sea)
gsw_SA_from_SP_Baltic Calculates Absolute Salinity in the Baltic Sea
gsw_SP_from_SA_Baltic Calculates Practical Salinity in the Baltic Sea
gsw_infunnel "oceanographic funnel" check for the 25-term equation
gsw_entropy_part entropy minus the terms that are a function of only SA
gsw_entropy_part_zerop entropy_part evaluated at 0 dbar
gsw_interp_McD_Klocker linearly interpolates the reference cast
gsw_interp_SA_CT linearly interpolates (SA,CT,p) to the desired p
gsw_gibbs_pt0_pt0 gibbs(0,2,0,SA,t,0)
gsw_specvol_SSO_0_CT25 spec_vol_CT25(35.16504,0,p)
gsw_enthalpy_SSO_0_CT25 enthalpy_CT25(35.16504,0,p)
The GSW data set.
gsw_data_v2_0 contains (1) the global data set of Absolute Salinity Anomaly,
(2) a reference cast (for the McD_Klocker streamfunction), and
(3) three vertical profiles of (SP, t, p) at known long & lat, plus
the outputs of all the GSW functions for these 3 profiles, and
the required accuracy of all these outputs.
Licences and 3rd party software
gsw_licence creative commons licence for the GSW Oceanographic Toolbox
cprintf prints colour text to the screen (third part software)
cprintf_licence licence for cprintf software