gas_schmidt: The Schmidt Number for Gases in Seawater

gas_schmidtR Documentation

The Schmidt Number for Gases in Seawater


The Schmidt number as a function of temperature (0-30dgC) and for a salinity of 35.

Sc = v/D = Mu/(rho+D)

where v is the kinematic viscosity of the water and D is the mass diffusivity, rho is density and mu is the viscosity.

Schmidt numbers are used to estimate the gas transfer velocity.


gas_schmidt(t = 25, species = c("He", "Ne", "N2", "O2", "Ar",
        "Kr", "Rn", "CH4","CO2", "N2O", "CCl2F2", "CCL3F",
        "SF6", "CCl4"))



Temperature in ^\circC,


character vector with gasses whose schmidt number should be estimated.


The Schmidt number, a dimensionless quantity.


Karline Soetaert <>


Sarmiento JL and Gruber N, 2006. Ocean Biogeochemical Dynamics. Princeton University Press, Princeton. p 85.

who cite:

Wanninkhof R, 1992. Relationship between wind speed and gas exchange over the ocean. Journ. Geophys. Res. 97, 7373-7383.

except for O_2:

Keeling et al., 1998. Seasonal variation in the atmospheric O2/N2 ratio in relation to the kinetics of air-sea gas exchange. Global Biogeochemical Cycles 12, 141-164.

CFC-11 (CCl_2F_2), and CFC-12 (CCl_3F):

Zheng et al., 1998. Measurements of the diffusion coefficients of CF-11 and CF-12 in pure water and seawater. Journ. Geophys. Res. 103, 1375-1379.

and CCl_4 (Wanninkhof, pers.comm).

See Also

gas_O2sat, gas_satconc, gas_solubility, gas_transfer, atmComp, vapor


gas_schmidt(species = "CO2", t = 20) # about660

marelac documentation built on Sept. 25, 2023, 5:06 p.m.