Redfield Ratio NP Checker
Actual pooled N/P MOLAR inventory versus explicit reference, not mass ratio, species constants or nutrient limitation diagnosis. 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
Nitrogen-to-phosphorus ratios depend on whether inventories are expressed in moles or mass.
Nitrogen-to-phosphorus ratios depend on whether inventories are expressed in moles or mass.1
This tool compares pooled molar inventory with a supplied reference ratio.
When to use Redfield Ratio NP Checker
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 Redfield Ratio NP Checker and understand its results
- Match the observation interval, units, datum, coordinate signs and model regime.
- Enter observedNitrogenMol, observedPhosphorusMol, callerReferenceNpMolarRatio, using the field meanings and rules below, then run the tool.
- Read pooledNpMolarRatio, signedNpReferenceDifference. 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 |
|---|---|---|---|
| observedNitrogenMol | Observed nitrogen mol | list of number | Required |
| observedPhosphorusMol | Observed phosphorus mol | list of number | Required |
| callerReferenceNpMolarRatio | Caller reference np molar ratio | number | Required |
Use nonempty aligned nitrogen inventories≥0 and phosphorus inventories>0 with a positive reference. Sum each inventory separately, divide total N by total P, then subtract the reference. This is not the mean of row ratios.
ratio=ΣN/ΣP; deviation=ratio−reference Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| pooledNpMolarRatio | Pooled np molar ratio | number |
| signedNpReferenceDifference | Signed np reference difference; preserve the subtraction order and sign defined in the mechanics | number |
{
"input": {
"observedNitrogenMol": [
10,
20
],
"observedPhosphorusMol": [
1,
1
],
"callerReferenceNpMolarRatio": 16
},
"output": {
"pooledNpMolarRatio": 15,
"signedNpReferenceDifference": -1
}
}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 Apparent Oxygen Utilization AOU Calculator: Apparent oxygen utilization is saturation oxygen minus observed oxygen in matched units.
References
-
Redfield Ratio NP Checker — tool.io
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.
- Apparent Oxygen Utilization AOU Calculator
Apparent oxygen utilization is saturation oxygen minus observed oxygen in matched units.