pCa {seacarb}R Documentation

pCa

Description

Calculates the changes in the saturation states of aragonite and calcite resulting from the manipulation of the calcium concentration

Usage

pCa(flag, var1, var2, Ca, S=35, T=20, P=0, Pt=0, Sit=0)

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 Value of the first variable in mol/kg, except for pH and for pCO2 in μatm
var2 Value of the second variable in mol/kg, except for pH
Ca Calcium concentration in mol/kg
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

Details

This function assumes that the simplified synthetic sea water recipe described by Dickson et al. (2007) was used. It is the basis of the synthetic seawater that has been used to determine a variety of equilibrium constants for use in sea water.

Note that this function does not account for the effect of the changes in the calcium concentration of the dissociation constants of carbonic acid and on the solubility product of CaCO3 (Ben-Yaakov and Goldhaber, 1973).

Value

The function returns a data frame containing the following columns:

comment The initial or final state water
S Salinity
T Temperature in degrees Celsius
P Pressure in bar
pH pH
CO2 CO2 concentration (mol/kg)
pCO2 pCO2, CO2 partial pressure (μatm)
fCO2 fCO2, CO2 fugacity (μatm)
HCO3 HCO3 concentration (mol/kg)
CO3 CO3 concentration (mol/kg)
DIC DIC concentration (mol/kg)
ALK ALK, total alkalinity (mol/kg)
OmegaAragonite Omega aragonite, aragonite saturation state
OmegaCalcite Omega calcite, calcite saturation state

Author(s)

Jean-Pierre Gattuso gattuso@obs-vlfr.fr

References

Ben-Yaakov S. and Goldhaber M. B., 1973 The influence of sea water composition on the apparent constants of the carbonate system. Deep-Sea Research 20, 87-99.

Dickson A. G., Sabine C. L. and Christian J. R., 2007 Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 1-191.

Examples

pCa(flag=15, var1=2302e-6, var2=2050e-6, Ca=0.01028, S=35, T=20, P=0, Pt=0, Sit=0) # with normal Ca concentration
pCa(flag=15, var1=2302e-6, var2=2050e-6, Ca=0.01028/2, S=35, T=20, P=0, Pt=0, Sit=0) # with 0.5 * Ca concentration

[Package seacarb version 2.0.6 Index]