psi {seacarb}R Documentation

Molar ratio of CO2 released vs CaCO3 precipitated

Description

Returns the molar ratio of CO2 released vs CaCO3 precipitated described by Frankignoulle et al. (1994).

Usage

psi(flag, var1, var2, S=35, T=20, P=0, Pt=0, Sit=0, pHscale="T", kf="pf", k1k2="l")

Arguments

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 Goyet (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"

Details

Note that 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 can therefore be critical to use vectors of the same length. For instance, to compute parameters from one couple of variable for a range of temperatures, a vector with temperatures required can be given in enter and other arguments can be completed be one variable this variable will be used for each temperatures.

Value

The function returns a data frame containing the following columns:

psi ratio of CO2 released vs CaCO3 precipitated (mol/mol)

Author(s)

Jean-Pierre Gattuso gattuso@obs-vlfr.fr

References

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.

See Also

speciation.

Examples

## 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")

[Package seacarb version 2.1.2 Index]