Omega Aragonite Carbonate State
Calculate aragonite ion-activity saturation on a caller consistent molal/activity Ksp convention; conditional seawater concentration Ksp must not be mixed with separate activity corrections.
Description
Aragonite saturation compares an ion-activity product with a consistent solubility product.
Aragonite saturation compares an ion-activity product with a consistent solubility product. Activity and conditional concentration conventions must not be mixed.
Calculate aragonite ion-activity saturation on a caller consistent molal/activity Ksp convention; conditional seawater concentration Ksp must not be mixed with separate activity corrections.
When to use Omega Aragonite Carbonate State
Use this tool to calculate aragonite ion-activity saturation on a caller consistent molal/activity Ksp convention; conditional seawater concentration Ksp must not be mixed with separate activity corrections.
Gather the water, wave, current or profile observations and any supplied calibration constants. Confirm units and the stated coordinate and pressure conventions.
How to use Omega Aragonite Carbonate State and understand its results
- Gather the water, wave, current or profile observations and any supplied calibration constants. Confirm units and the stated coordinate and pressure conventions.
- Enter calciumMolPerKg, carbonateMolPerKg, calciumActivityCoefficient, carbonateActivityCoefficient, consistentAragoniteSolubilityProduct using the field table and calculation rules, then run the tool.
- Read aragoniteSaturationState, belowEquilibriumSaturation. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| calciumMolPerKg | Calcium mol per kg | number | Required |
| carbonateMolPerKg | Carbonate mol per kg | number | Required |
| calciumActivityCoefficient | Calcium activity coefficient | number | Required |
| carbonateActivityCoefficient | Carbonate activity coefficient | number | Required |
| consistentAragoniteSolubilityProduct | Consistent aragonite solubility product | number | Required |
Use nonnegative molal concentrations and positive coefficients and Ksp. Return omega and a strict below-one flag; equality is equilibrium saturation.1
omega = calcium mol/kg × carbonate mol/kg × both activity coefficients/Ksp Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| aragoniteSaturationState | Aragonite saturation state | number |
| belowEquilibriumSaturation | Below equilibrium saturation | boolean |
{
"input": {
"calciumMolPerKg": 0.01,
"carbonateMolPerKg": 0.0002,
"calciumActivityCoefficient": 0.5,
"carbonateActivityCoefficient": 0.5,
"consistentAragoniteSolubilityProduct": 0.000001
},
"output": {
"aragoniteSaturationState": 0.5000000000000001,
"belowEquilibriumSaturation": true
}
}Limitations and assumptions
Carbonate speciation and conditional seawater Ksp conversion are external.
Numbers and computed results must be finite; overflow produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Ocean PH Drop Decade Rate: Fit observed pH trend and its multiplicative hydrogen-activity interpretation on one consistent pH scale; pH is logarithmic, and activity is not molar concentration without an activity convention. For a complementary task, use Seawater Density TSP: Compute UNESCO EOS-80 seawater density for 0–40 °C IPTS-68, practical salinity 0–42 and gauge pressure 0–10000 dbar; not TEOS-10 or potential density.
References
-
Omega Aragonite Carbonate State — tool.io
Similar or alternative tools
- Ocean PH Drop Decade Rate
Fit observed pH trend and its multiplicative hydrogen-activity interpretation on one consistent pH scale; pH is logarithmic, and activity is not molar concentration without an activity convention.
- Seawater Density TSP
Compute UNESCO EOS-80 seawater density for 0–40 °C IPTS-68, practical salinity 0–42 and gauge pressure 0–10000 dbar; not TEOS-10 or potential density.