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gsw

gsw is an R package that provides a connection to the thermodynamic equation of seawater as defined at teos-10.org. An earlier version of gsw was referenced to TEOS-10 version 3.03, but the present one is referenced to version 3.05-4, which is current as of Aug 7, 2017. See the CRAN website for check statistics, etc.

All the gsw functions reproduce teos-10.org test values to a tolerance of 1.5e-8, the default for numerical comparison in R working on a 64-bit machine. (The tests are part of the package-building process, as is usual in R.)

Function names, as well as most argument names, match those used in the TEOS-10 documentation.

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Version

Install

install.packages('gsw')

Monthly Downloads

2,822

Version

1.0-5

License

GPL (>= 2) | file LICENSE

Maintainer

Last Published

August 9th, 2017

Functions in gsw (1.0-5)

gsw_CT_first_derivatives

First Derivatives of Conservative Temperature

gsw_CT_first_derivatives_wrt_t_exact

Derivatives of Conservative Temperature with Respect to or at Constant in-situ Temperature

gsw_CT_freezing

Conservative Temperature of Freezing Seawater

gsw_CT_freezing_first_derivatives

First Derivatives of Conservative Temperature for Freezing Water

gsw_CT_freezing_first_derivatives_poly

First Derivatives of Conservative Temperature for Freezing Water (Polynomial version)

gsw_CT_freezing_poly

Conservative Temperature Freezing Point (Polynomial version)

Reshape list elements to match that of the first element

R implementation of Thermodynamic Equation Of Seawater - 2010 (TEOS-10)

gsw_CT_from_enthalpy

Conservative Temperature from Enthalpy

gsw_CT_from_entropy

Conservative Temperature from Entropy

Ratio of Absolute to Preformed Salinity, minus 1

gsw_Helmholtz_energy_ice

Helmholtz Energy of Ice

gsw_SA_freezing_from_t_poly

Compute Absolute Salinity at Freezing in-situ Temperature (Polynomial version)

Convert from Practical Salinity to Absolute Salinity

Conservative Temperature from Potential Temperature

gsw_CT_from_rho

Conservative Temperature from Density, Absolute Salinity and Pressure

gsw_SA_from_SP_Baltic

Convert from Practical Salinity to Absolute Salinity (Baltic)

gsw_SA_from_Sstar

Absolute Salinity from Preformed Salinity

Convert from temperature to conservative temperature

gsw_CT_maxdensity

Conservative Temperature at Maximum Density

gsw_SA_freezing_from_CT_poly

Compute Absolute Salinity at Freezing Point (Polynomial version)

gsw_SA_freezing_from_t

Compute Absolute Salinity at Freezing in-situ Temperature

gsw_Sstar_from_SP

Convert from Practical Salinity to Preformed Salinity

gsw_Turner_Rsubrho

Turner Angle and Density Ratio

gsw_chem_potential_water_t_exact

Chemical Potential of Water in Seawater

Specific heat to ice

Calculate Practical Salinity from Reference Salinity

gsw_SP_from_Sstar

Practical Salinity from Preformed Salinity

Thermal expansion coefficient with respect to Conservative Temperature

gsw_CT_second_derivatives

Second Derivatives of Conservative Temperature

Electrical Conductivity from Practical Salinity

Absolute Salinity Anomaly Ratio

gsw_SA_freezing_from_CT

Compute Absolute Salinity at Freezing Conservative Temperature

Convert from Absolute Salinity to Practical Salinity

Calculate Practical Salinity from Knudsen Salinity

Cabbeling coefficient

gsw_chem_potential_water_ice

Chemical Potential of Ice

Calculate Reference Salinity from Practical Salinity

gsw_Sstar_from_SA

Convert from Absolute Salinity to Preformed Salinity

gsw_alpha_wrt_t_exact

Thermal expansion coefficient with respect to in-situ temperature

gsw_alpha_wrt_t_ice

Ice Thermal Expansion Coefficient with Respect to in-situ Temperature

gsw_alpha_on_beta

Thermal expansion coefficient over haline contraction coefficient

gsw_enthalpy_first_derivatives_CT_exact

First Derivatives of Enthalpy wrt CT

gsw_enthalpy_ice

Ice Specific Enthalpy

gsw_enthalpy_second_derivatives

Second Derivatives of Enthalpy

gsw_IPV_vs_fNsquared_ratio

Ratio of vert. gradient of pot. density to vert grad of locally-referenced pot density

Calculate Brunt Vaisala Frequency squared

gsw_SA_from_rho

Compute Absolute Salinity from Density, etc

Isobaric heat capacity

gsw_deltaSA_from_SP

Absolute Salinity Anomaly from Practical Salinity

gsw_entropy_ice

gsw_entropy_second_derivatives

Second Derivatives of Entropy

gsw_enthalpy_diff

Specific Enthalpy Difference with Pressure

gsw_enthalpy_first_derivatives

First Derivatives of Enthalpy

gsw_enthalpy_t_exact

Seawater Specific Enthalpy in terms of in-situ Temperature

gsw_entropy_first_derivatives

First Derivatives of Entropy

gsw_frazil_ratios_adiabatic_poly

Ratios of SA, CT and p changes when Frazil Ice Forms (polynomial form)

gsw_geo_strf_dyn_height

Geostrophic Dynamic Height Anomaly

gsw_kappa_const_t_ice

Isothermal Compressibility of Ice

Convert from Electrical Conductivity to Practical Salinity

gsw_adiabatic_lapse_rate_from_CT

Adiabatic Lapse Rate

gsw_adiabatic_lapse_rate_ice

Adiabatic Lapse Rate of Ice

Haline contraction coefficient at constant Conservative Temperature

gsw_enthalpy_second_derivatives_CT_exact

Second Derivatives of Enthalpy (exact)

gsw_geo_strf_dyn_height_pc

Geostrophic Dynamic Height Anomaly (Piecewise-Constant Profile)

Gibbs Energy of Seawater, and its Derivatives

gsw_melting_ice_SA_CT_ratio

Calculate d(SA)/d(CT) for Ice Melting in Seawater

gsw_beta_const_t_exact

Haline contraction coefficient at constant in-situ temperature

gsw_dilution_coefficient_t_exact

Dilution coefficient

gsw_dynamic_enthalpy

Dynamic enthalpy of seawater (75-term equation)

gsw_entropy_from_pt

Specific Entropy ito Absolute Salinity and Potential Temperature

Specific enthalpy of seawater (75-term equation)

gsw_enthalpy_CT_exact

Seawater Specific Enthalpy in terms of Conservative Temperature

gsw_frazil_properties

Properties of Frazil ice

gsw_frazil_properties_potential

Properties of Frazil ice i.t.o. potential enthalpy

Gibbs Energy of Ice, and its Derivatives

Gravitational Acceleration

gsw_latentheat_evap_t

Latent heat of evaporation

gsw_latentheat_melting

Latent Heat of Melting

gsw_melting_ice_SA_CT_ratio_poly

Calculate d(SA)/d(CT) for Ice Melting in Seawater (Polynomial version)

gsw_melting_ice_equilibrium_SA_CT_ratio

Calculate d(SA)/d(CT) for Ice Melting in near-freezing Seawater

gsw_melting_ice_equilibrium_SA_CT_ratio_poly

Calculate d(SA)/d(CT) for Ice Melting in near-freezing Seawater (Polynomial version)

gsw_pt_first_derivatives

First Derivatives of Potential Temperature

Potential temperature from Conservative Temperature

In-situ density

gsw_rho_alpha_beta

In-situ density, thermal expansion coefficient and haline contraction coefficient (75-term equation)

gsw_pot_enthalpy_ice_freezing_first_derivatives

First Derivatives of Potential Enthalpy

gsw_pot_enthalpy_ice_freezing_first_derivatives_poly

First Derivatives of Potential Enthalpy (Polynomial version)

gsw_pot_enthalpy_ice_freezing_poly

Potential Enthalpy of Ice at Freezing Point (Polynomial version)

gsw_pot_rho_t_exact

Potential density

In-situ density of ice

gsw_rho_second_derivatives

Second Derivatives of Density

Potential density anomaly referenced to 0 dbar

gsw_specvol_second_derivatives_wrt_enthalpy

Second Derivatives of Specific Volume wrt Enthalpy

gsw_ice_fraction_to_freeze_seawater

Ice Fraction to Cool Seawater to Freezing

gsw_internal_energy

Specific Internal Energy of Seawater (75-term equation)

gsw_internal_energy_ice

Specific Internal Energy of Ice (75-term equation)

Isentropic Compressibility of Seawater (75-term equation)

gsw_seaice_fraction_to_freeze_seawater

Sea ice Fraction to Cool Seawater to Freezing

gsw_entropy_from_t

Specific Entropy i.t.o. Absolute Salinity, Temperature, and Pressure

gsw_frazil_properties_potential_poly

Properties of Frazil ice i.t.o. potential enthalpy (polynomial version)

gsw_frazil_ratios_adiabatic

Ratios of SA, CT and p changes when Frazil Ice Forms

gsw_kappa_t_exact

Isentropic compressibility of seawater (exact)

Isentropic Compressibility of Ice

gsw_melting_ice_into_seawater

Calculate properties related to ice melting in seawater

gsw_melting_seaice_into_seawater

Calculate properties related to seaice melting in seawater

gsw_pt_from_entropy

Potential Temperature from Entropy

gsw_pt_from_pot_enthalpy_ice

Potential Temperature from Potential Enthalpy of Ice

gsw_pt_from_pot_enthalpy_ice_poly

Potential Temperature from Potential Enthalpy of Ice (Polynomial version)

Potential Temperature from in-situ Temperature

gsw_rho_second_derivatives_wrt_enthalpy

Second Derivatives of Density wrt Enthalpy

gsw_rho_t_exact

In-situ Density of Seawater

gsw_specvol_t_exact

Specific Volume of Seawater

Seawater Spiciness at p=2000 dbar

gsw_t_deriv_chem_potential_water_t_exact

Derivative of Chemical Potential of Water in Seawater wrt Temperature

Height from Pressure

Potential density anomaly referenced to 3000 dbar

Potential density anomaly referenced to 4000 dbar

gsw_specvol_ice

Specific Volume of Ice

gsw_specvol_second_derivatives

Second Derivatives of Specific Volume

gsw_t_freezing_first_derivatives_poly

Derivatives of Freezing Water Properties (Polynomial version)

gsw_pot_enthalpy_from_pt_ice_poly

Potential Enthalpy of Ice (Polynomial version)

gsw_pot_enthalpy_ice_freezing

Potential Enthalpy of Ice at Freezing Point

Potential temperature referenced to the surface

gsw_pt0_from_t_ice

Potential Temperature of Ice Referenced to the Surface

Global SA lookup file

gsw_specvol_first_derivatives

First Derivatives of Specific Volume

gsw_specvol_first_derivatives_wrt_enthalpy

First Derivatives of Specific Volume wrt Enthalpy

Seawater Spiciness at p=0 dbar

Seawater Spiciness at p=1000 dbar

gsw_latentheat_evap_CT

Latent heat of evaporation

Pressure from height (75-term equation)

gsw_pot_enthalpy_from_pt_ice

Potential Enthalpy of Ice

In situ temperature from Conservative Temperature

gsw_rho_first_derivatives

Density First Derivatives wrt SA, CT and p (75-term equation)

gsw_rho_first_derivatives_wrt_enthalpy

Density First Derivatives wrt enthalpy (75-term equation)

gsw_sound_speed

gsw_sound_speed_ice

Sound speed in ice

gsw_specvol_alpha_beta

Specific Volume, alpha, and beta

gsw_specvol_anom_standard

Specific volume anomaly [standard] (75-term equation)

Freezing Temperature of Seawater

gsw_t_freezing_first_derivatives

Derivatives of Freezing Water Properties

gsw_pressure_coefficient_ice

Pressure Coefficient for Ice

gsw_pressure_freezing_CT

Pressure at which Seawater Freezes

gsw_pt_from_t_ice

Potential Temperature of Ice from in-situ Temperature

gsw_pt_second_derivatives

Second Derivatives of Potential Temperature

Potential density anomaly referenced to 1000 dbar

Potential density anomaly referenced to 2000 dbar

gsw_sound_speed_t_exact

Sound Speed in Seawater

Specific Volume of Seawater

gsw_t_from_pt0_ice

In situ Temperature from Potential Temperature at 0dbar

gsw_thermobaric

Thermobaric coefficient (75-term equation)