Apparent Oxygen Utilization AOU Calculator
Independent matched saturation minus observed oxygen, signed supersaturation retained, no inferred respiration/age or mass/mole conversion. Caller independently establishes units, regime, calibration and applicability; this does not establish design-code compliance, authenticity, operational safety, treatment efficacy or a validated forecast.
Description
Apparent oxygen utilization is saturation oxygen minus observed oxygen in matched units.
Apparent oxygen utilization is saturation oxygen minus observed oxygen in matched units.1
Supersaturation produces a negative value and does not automatically imply a biological process.
When to use Apparent Oxygen Utilization AOU Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match the observation interval, units, datum, coordinate signs and model regime.
How to use Apparent Oxygen Utilization AOU Calculator and understand its results
- Match the observation interval, units, datum, coordinate signs and model regime.
- Enter observedDissolvedOxygenMolM3, callerMatchedSaturationOxygenMolM3, using the field meanings and rules below, then run the tool.
- Read signedApparentOxygenUtilizationMolM3. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedDissolvedOxygenMolM3 | Observed dissolved oxygen mol m3 | list of number | Required |
| callerMatchedSaturationOxygenMolM3 | Caller matched saturation oxygen mol m3 | list of number | Required |
Use nonempty aligned observed oxygen≥0 and independently matched saturation oxygen>0. Subtract observed from saturation and retain negative results.
AOU_i=O2_saturation_i−O2_observed_i Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| signedApparentOxygenUtilizationMolM3 | Signed apparent oxygen utilization mol m3; preserve the subtraction order and sign defined in the mechanics | list of number |
{
"input": {
"observedDissolvedOxygenMolM3": [
0.2,
0.3
],
"callerMatchedSaturationOxygenMolM3": [
0.25,
0.25
]
},
"output": {
"signedApparentOxygenUtilizationMolM3": [
0.04999999999999999,
-0.04999999999999999
]
}
}Limitations and assumptions
The stated observation or model covers only the supplied record and reference regime. It does not fill missing measurements, supply uncertainty estimates or produce a validated forecast.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above.
Alternative or Complementary methods
For a related step, use Revelle Factor Buffer Lookup: The Revelle factor describes a normalized carbon-dioxide response to a change in dissolved inorganic carbon at a matched state. For a complementary comparison, use Redfield Ratio NP Checker: Nitrogen-to-phosphorus ratios depend on whether inventories are expressed in moles or mass.
References
Similar or alternative tools
- Revelle Factor Buffer Lookup
The Revelle factor describes a normalized carbon-dioxide response to a change in dissolved inorganic carbon at a matched state.
- Redfield Ratio NP Checker
Nitrogen-to-phosphorus ratios depend on whether inventories are expressed in moles or mass.