Dissolved oxygen at saturation

Source: R/oxySol.R

Finds dissolved oxygen concentration in equilibrium with water-saturated air.

oxySol(t, S, P = NULL)

Arguments

t

temperature, degrees C

S

salinity, on the Practical Salinity Scale

P

pressure, atm

Value

Dissolved oxygen concentration in mg/L at 100% saturation. If P = NULL, saturation values at 1 atm are calculated.

Details

Calculations are based on the approach of Benson and Krause (1984), using Green and Carritt's (1967) equation for dependence of water vapor partial pressure on t and S. Equations are valid for temperature in the range 0-40 C and salinity in the range 0-40.

References

Benson, B.B. and Krause, D. (1984) The concentration and isotopic fractionation of oxygen dissolved in fresh-water and seawater in equilibrium with the atmosphere. Limnology and Oceanography 29, 620-632.

Green, E.J. and Carritt, D.E. (1967) New tables for oxygen saturation of seawater. Journal of Marine Research 25, 140-147.

Author

Alan Jassby, James Cloern

Examples


# Convert DO into % saturation for 1-m depth at Station 32.
# Use convention of expressing saturation at 1 atm.
sfb1 <- subset(sfbay, depth == 1 & stn == 32)
dox.pct <- with(sfb1, 100 * dox/oxySol(temp, sal))
summary(dox.pct)
#>    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's 
#>   71.78   87.04   91.90   94.90   97.27  170.83     115