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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, which is current as of early 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 match those used specified in the TEOS-10 documentation.

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Version

Install

install.packages('gsw')

Monthly Downloads

2,050

Version

1.0-4

License

GPL (>= 2) | file LICENSE

Maintainer

Dan Kelley

Last Published

August 2nd, 2017

Functions in gsw (1.0-4)

gsw_CT_from_enthalpy

Conservative Temperature from Enthalpy

gsw_CT_from_entropy

Conservative Temperature from Entropy

gsw_CT_freezing

Conservative Temperature of Freezing Seawater

gsw_CT_freezing_first_derivatives

First Derivatives of Conservative Temperature for Freezing Water

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_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)

Ratio of Absolute to Preformed Salinity, minus 1

gsw_Helmholtz_energy_ice

Helmholtz Energy of Ice

Absolute Salinity Anomaly Ratio

gsw_SA_freezing_from_CT

Compute Absolute Salinity at Freezing Conservative Temperature

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_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

Convert from temperature to conservative temperature

gsw_CT_maxdensity

Conservative Temperature at Maximum Density

gsw_SA_from_SP_Baltic

Convert from Practical Salinity to Absolute Salinity (Baltic)

gsw_SA_from_Sstar

Absolute Salinity from Preformed Salinity

gsw_Sstar_from_SP

Convert from Practical Salinity to Preformed Salinity

gsw_Turner_Rsubrho

Turner Angle and Density Ratio

Thermal expansion coefficient with respect to Conservative Temperature

gsw_alpha_on_beta

Thermal expansion coefficient over haline contraction coefficient

gsw_CT_second_derivatives

Second Derivatives of Conservative Temperature

Electrical Conductivity from Practical Salinity

gsw_SA_freezing_from_t_poly

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

Convert from Practical Salinity to Absolute Salinity

Convert from Absolute Salinity to Practical Salinity

Calculate Practical Salinity from Knudsen 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

Conservative Temperature from Potential Temperature

gsw_CT_from_rho

Conservative Temperature from Density, Absolute Salinity and Pressure

gsw_SA_from_rho

Compute Absolute Salinity from Density, etc

Convert from Electrical Conductivity to Practical Salinity

Calculate Reference Salinity from Practical Salinity

gsw_Sstar_from_SA

Convert from Absolute Salinity to Preformed Salinity

gsw_chem_potential_water_t_exact

Chemical Potential of Water in Seawater

Calculate Practical Salinity from Reference Salinity

gsw_SP_from_Sstar

Practical Salinity from Preformed Salinity

Cabbeling coefficient

gsw_chem_potential_water_ice

Chemical Potential of Ice

gsw_dilution_coefficient_t_exact

Dilution coefficient

gsw_dynamic_enthalpy

Dynamic enthalpy of seawater (75-term equation)

gsw_enthalpy_t_exact

Seawater Specific Enthalpy in terms of in-situ Temperature

gsw_entropy_first_derivatives

First Derivatives of Entropy

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_geo_strf_dyn_height_pc

Geostrophic Dynamic Height Anomaly (Piecewise-Constant Profile)

Gibbs Energy of Seawater, and its Derivatives

gsw_latentheat_evap_t

Latent heat of evaporation

gsw_latentheat_melting

Latent Heat of Melting

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_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

gsw_sound_speed

gsw_sound_speed_ice

Sound speed in ice

gsw_specvol_second_derivatives_wrt_enthalpy

Second Derivatives of Specific Volume wrt Enthalpy

gsw_specvol_t_exact

Specific Volume of Seawater

gsw_t_from_pt0_ice

In situ Temperature from Potential Temperature at 0dbar

gsw_thermobaric

Thermobaric coefficient (75-term equation)

Specific enthalpy of seawater (75-term equation)

gsw_enthalpy_CT_exact

Seawater Specific Enthalpy in terms of Conservative Temperature

gsw_entropy_from_pt

Specific Entropy ito Absolute Salinity and Potential Temperature

gsw_entropy_from_t

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

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_internal_energy_ice

Specific Internal Energy of Ice (75-term equation)

Isentropic Compressibility of Seawater (75-term equation)

Pressure from height (75-term equation)

gsw_pot_enthalpy_from_pt_ice

Potential Enthalpy of Ice

Isobaric heat capacity

gsw_deltaSA_from_SP

Absolute Salinity Anomaly from Practical Salinity

gsw_enthalpy_second_derivatives

Second Derivatives of Enthalpy

Specific heat to ice

gsw_enthalpy_first_derivatives_CT_exact

First Derivatives of Enthalpy wrt CT

gsw_enthalpy_ice

Ice Specific 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_kappa_t_exact

Isentropic compressibility of seawater (exact)

gsw_latentheat_evap_CT

Latent heat of evaporation

gsw_enthalpy_second_derivatives_CT_exact

Second Derivatives of Enthalpy (exact)

gsw_pt_from_entropy

Potential Temperature from Entropy

gsw_pt_from_pot_enthalpy_ice

Potential Temperature from Potential Enthalpy of Ice

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_rho_second_derivatives_wrt_enthalpy

Second Derivatives of Density wrt Enthalpy

gsw_rho_t_exact

In-situ Density of Seawater

gsw_specvol_ice

Specific Volume of Ice

gsw_beta_const_t_exact

Haline contraction coefficient at constant in-situ temperature

gsw_enthalpy_diff

Specific Enthalpy Difference with Pressure

gsw_enthalpy_first_derivatives

First Derivatives of Enthalpy

gsw_entropy_ice

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

gsw_pot_enthalpy_ice_freezing_poly

Potential Enthalpy of Ice at Freezing Point (Polynomial version)

gsw_pot_rho_t_exact

Potential density

gsw_specvol_second_derivatives

Second Derivatives of Specific Volume

Seawater Spiciness at p=0 dbar

Seawater Spiciness at p=1000 dbar

In-situ density

gsw_rho_alpha_beta

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

Potential density anomaly referenced to 1000 dbar

gsw_entropy_second_derivatives

Second Derivatives of Entropy

Gibbs Energy of Ice, and its Derivatives

Gravitational Acceleration

gsw_frazil_properties

Properties of Frazil ice

gsw_frazil_properties_potential

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

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

Potential density anomaly referenced to 2000 dbar

gsw_specvol_alpha_beta

Specific Volume, alpha, and beta

gsw_specvol_anom_standard

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

Seawater Spiciness at p=2000 dbar

gsw_t_deriv_chem_potential_water_t_exact

Derivative of Chemical Potential of Water in Seawater wrt Temperature

gsw_kappa_const_t_ice

Isothermal Compressibility of Ice

Isentropic Compressibility of Ice

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)

Potential temperature referenced to the surface

gsw_pt0_from_t_ice

Potential Temperature of Ice Referenced to the Surface

gsw_pt_from_pot_enthalpy_ice_poly

Potential Temperature from Potential Enthalpy of Ice (Polynomial version)

Potential Temperature from in-situ Temperature

Potential density anomaly referenced to 3000 dbar

Potential density anomaly referenced to 4000 dbar

gsw_sound_speed_t_exact

Sound Speed in Seawater

Specific Volume of Seawater

Freezing Temperature of Seawater

gsw_t_freezing_first_derivatives

Derivatives of Freezing Water Properties

gsw_melting_ice_SA_CT_ratio

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

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 of ice

gsw_rho_second_derivatives

Second Derivatives of Density

gsw_seaice_fraction_to_freeze_seawater

Sea ice Fraction to Cool Seawater to Freezing

Potential density anomaly referenced to 0 dbar

gsw_specvol_first_derivatives

First Derivatives of Specific Volume

gsw_specvol_first_derivatives_wrt_enthalpy

First Derivatives of Specific Volume wrt Enthalpy

gsw_t_freezing_first_derivatives_poly

Derivatives of Freezing Water Properties (Polynomial version)

In situ temperature from Conservative Temperature

Height from Pressure

Global SA lookup file