psi {seacarb} | R Documentation |
Returns the molar ratio of CO2 released vs CaCO3 precipitated described by Frankignoulle et al. (1994).
psi(flag, var1, var2, S=35, T=20, P=0, Pt=0, Sit=0, pHscale="T", kf="pf", k1k2="l")
flag |
select the couple of variables available. The flags which can be used are:
flag = 1 pH and CO2 given flag = 2 CO2 and HCO3 given flag = 3 CO2 and CO3 given flag = 4 CO2 and ALK given flag = 5 CO2 and DIC given flag = 6 pH and HCO3 given flag = 7 pH and CO3 given flag = 8 pH and ALK given flag = 9 pH and DIC given flag = 10 HCO3 and CO3 given flag = 11 HCO3 and ALK given flag = 12 HCO3 and DIC given flag = 13 CO3 and ALK given flag = 14 CO3 and DIC given flag = 15 ALK and DIC given flag = 21 pCO2 and pH given flag = 22 pCO2 and HCO3 given flag = 23 pCO2 and CO3 given flag = 24 pCO2 and ALK given flag = 25 pCO2 and DIC given |
var1 |
enter value of the first variable in mol/kg, except for pH and for pCO2 in μatm |
var2 |
enter value of the second variable in mol/kg, except for pH |
S |
Salinity |
T |
Temperature in degrees Celsius |
P |
Hydrostatic pressure in bar (surface = 0) |
Pt |
Concentration of total phosphate in mol/kg |
Sit |
Concentration of total silicate in mol/kg |
pHscale |
choice of pH scale: "T" for the total scale, "F" for the free scale and "SWS" for using the seawater scale, default is "T" (total scale) |
kf |
"pf" for using Kf from Perez and Fraga (1987) and "dg" for using Kf from Dickson and Riley (1979), default is "pf" |
k1k2 |
"l" for using K1 and K2 from Lueker et al. and "r" for using K1 and K2 from Roy et al. , default is "l" |
The arguments can be given as a unique number or as vectors. If the lengths of the vectors are different, the longer vector is retained and only the first value of the other vectors is used. It is recommended to use either vectors with the same dimension or one vector for one argument and numbers for the other arguments.
The function returns a data frame containing the following columns:
psi |
ratio of CO2 released vs CaCO3 precipitated (mol/mol) |
Jean-Pierre Gattuso gattuso@obs-vlfr.fr
Frankignoulle, M. 1994 A complete set of buffer factors for acid/base CO2 system in seawater. Journal of Marine Systems 5, 111-118.
Frankignoulle, M., Canon, C. & Gattuso, J.-P., 1994. Marine calcification as a source of carbon dioxide- Positive feedback of increasing atmospheric CO2. Limnology and Oceanography 2, 458-462.
## Calculation using the numerical example given in Frankignoulle et al. (1994) psi(flag=24, var1=350, var2=2400e-6, S=35, T=25, P=0, Pt=0, Sit=0, pHscale="T", kf="pf", k1k2="l")