get.G: Calculate net gas flux of CO2 or O2

In gholtgrieve/gassyPants: Functions Useful for Working With Gasses Dissolved in Water

Description

Calculates net flux of CO2 or O2 across the air water interface for one time step. O2 flux is calculated as the difference between the O2 concentraton at saturation and O2 concentration observed, times the O2-specific reaeration coefficent corrected for water temperature. CO2 flux is calculated as the difference between the partial pressure of CO2 in air and in water, times the CO2-specific reaeration coefficent corrected for water temperature and Henery's constant.

Usage

get.G(temperature, O2conc, kstd, depth, gas = 'O2')
get.G(temperature, pCO2water, pCO2air, kstd, depth, gas = 'CO2')

Arguments

temperature	Water termperature in degrees Celsius (C).
salinity	Salinity in parts per thousand (ppt or PSU). Defaults to 0.
pressure	Atmopheric pressure in atmospheres (atm). Defults to 1.
O2conc	Dissolved oxygen concentration at the begining of the time step. Required if gas == "O2". Units of micromoles per liter (umol/L)
pCO2water	Partial pressure of CO2 in water at the begining of the time step. Required if gas == "CO2". Units of microatmospheres (Uatm).
pCO2air	Partial pressure of CO2 in air above the water body. Required if gas == "CO2". Defaults to 410. Units of microatmospheres (uatm).
kstd	Gas transfer velocity of CO2 at a standardized temperature (indicated by referenceT) in units of meters per second. kstd will be corrected for water temperature and gas (O2) if needed.
referenceT	Standardized water temperature for kstd in degrees Celsius. Defaults to 20.
depth	Depth of the mixed layer or stream depth in meters
gas	Character string indicating the gas for which net flux is desired. Options are "O2" or "CO2".

Value

Numeric vector of net gas flux.

Author(s)

Gordon W. Holtgrieve

References

Lynch et al. (2010), J. Geophys. Res., 115, G03016 Holtgrieve et al. (2010) Limn. Ocean. 55 (3): 1047–1063

gholtgrieve/gassyPants documentation built on May 9, 2019, 5:02 a.m.