Calculate dissolved argon saturation

Calculates the dissolved argon concentration in equilibrium with the atmosphere from water temperature, barometric pressure, and salinity, using the Hamme and Emerson (2004) solubility fit for argon in air-equilibrated water.

Usage

calc_Arsat(
  temp_water,
  atmo_press,
  units = "atm",
  salinity = 0,
  out_units = "umol/L"
)

Arguments

temp_water

Numeric vector. Water temperature in degrees Celsius.

atmo_press

Numeric vector. Barometric pressure at the site.

units

Character string. Units of atmo_press. See convert_pressure() for accepted pressure units. Defaults to "atm".

salinity

Numeric vector. Salinity in parts per thousand. Defaults to freshwater (0).

out_units

Character string. Output concentration units, either "umol/L" (the default) or "mg/L".

Value

Numeric vector of dissolved Ar saturation in the requested units.

Details

The equilibrium concentration follows the Hamme and Emerson (2004) eq 1 fit with their Table 4 umol/kg coefficients, valid for water in equilibrium with water-vapor-saturated air at 1 atm total pressure. A vapor-pressure correction scales the 1 atm result to the supplied barometric pressure, and a salinity-aware density correction converts from a mass to a volume basis.

References

Hamme, R.C., and Emerson, S.R. (2004). The solubility of neon, nitrogen and argon in distilled water and seawater. Deep-Sea Research Part I, 51(11), 1517-1528.

See also

calc_N2sat(), calc_O2sat(), calc_CO2sat(), calc_CH4sat(), calc_N2Osat()

Examples

calc_Arsat(temp_water = 20, atmo_press = 1, salinity = 0)
#> [1] 13.9234

calc_Arsat(
  temp_water = c(5, 15, 25),
  atmo_press = 101.325,
  units = "kPa",
  out_units = "mg/L"
)
#> [1] 0.7789707 0.6163560 0.5059123