Isotope Trophic Enrichment Step Adjuster
Signedactualδ15Nminusindependentbaseline/minusqualifiedtrophicstepenrichment,not infer diet/agefrom universal 3.4permil. Actual independently identified specimens,matched units/taxon/cohort/source/edition/calibration and model applicability external;not individual identity,causation,diagnosis,absolute age certainty or validated forecast.
Description
Nitrogen-isotope values can be adjusted by a separately established baseline and trophic enrichment per step.
Nitrogen-isotope values can be adjusted by a separately established baseline and trophic enrichment per step.1
The signed residual describes the declared adjustment rather than identifying a diet.
When to use Isotope Trophic Enrichment Step Adjuster
Use this tool to apply the stated isotope trophic enrichment step adjuster operation with an explicit input and unit basis.
How to use Isotope Trophic Enrichment Step Adjuster and how it works
- Establish the measurement basis and units described above.
- Enter actualObservedDeltaNitrogen15, callerIndependentBaselineDeltaNitrogen15, callerIndependentTrophicEnrichmentPerStep, callerIndependentNumberOfTrophicSteps and run the tool.
- Read result.value using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualObservedDeltaNitrogen15 | Observed delta nitrogen15, on the basis specified in the algorithm. | number | required; finite; further conditions in the algorithm |
| callerIndependentBaselineDeltaNitrogen15 | Baseline delta nitrogen15, on the basis specified in the algorithm. | number | required; finite; further conditions in the algorithm |
| callerIndependentTrophicEnrichmentPerStep | Trophic enrichment per step, on the basis specified in the algorithm. | number | required; finite; further conditions in the algorithm |
| callerIndependentNumberOfTrophicSteps | Number of trophic steps, on the basis specified in the algorithm. | number | required; finite; nonnegative; further conditions in the algorithm |
Require nonnegative trophic-step count and finite isotope values and enrichment. Subtract baseline and enrichment times steps from observed delta nitrogen-15.
residual = observed δ15N − baseline δ15N − steps × enrichment Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.value | Signed isotope residual on the input delta-nitrogen-15 scale. | number |
{
"input": {
"actualObservedDeltaNitrogen15": 8,
"callerIndependentBaselineDeltaNitrogen15": 2,
"callerIndependentTrophicEnrichmentPerStep": 3,
"callerIndependentNumberOfTrophicSteps": 2
},
"output": {
"result": {
"value": 0
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A successful false boolean, negative signed difference, empty slice or unresolved tie is distinct from an input error. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Sr87/Sr86 Locality Match Checker. A strontium isotope ratio can overlap an independently established local reference range without uniquely establishing provenance.
For a related operation, use Brachiopod Shell Thickness to Environment Proxy Checker. Shell thickness can act as an environmental proxy only within a matched calibration and specimen context.
References
-
Isotope Trophic Enrichment Step Adjuster — tool.io
Similar or alternative tools
- Sr87/Sr86 Locality Match Checker
A strontium isotope ratio can overlap an independently established local reference range without uniquely establishing provenance.
- Brachiopod Shell Thickness to Environment Proxy Checker
Shell thickness can act as an environmental proxy only within a matched calibration and specimen context.