Sediment Accumulation Rate MM Year Calculator
Compute observed dated-marker mean sediment thickness accumulation; not radionuclide age inversion, mass accumulation, compaction correction or an assumption of uniform deposition outside markers.
Description
Two independently dated sediment markers define an interval-average thickness accumulation rate.
Two independently dated sediment markers define an interval-average thickness accumulation rate. This does not establish a continuous deposition history.1
Enter nonnegative depths, safe-integer years with deeper≥shallower and younger>older. Return mm/year; zero thickness difference is allowed.
When to use Sediment Accumulation Rate MM Year Calculator
Use Sediment Accumulation Rate MM Year Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No radionuclide inversion, compaction, mass accumulation or extrapolated uniform deposition is supplied.
Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
How to use Sediment Accumulation Rate MM Year Calculator and understand its results
- Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
- Enter deeperMarkerDepthMm, shallowerMarkerDepthMm, olderMarkerYear, youngerMarkerYear using the field table and calculation rules, then run the tool.
- Read observedMeanSedimentAccumulationMmYear. 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 |
|---|---|---|---|
| deeperMarkerDepthMm | Deeper marker depth mm | number | Required |
| shallowerMarkerDepthMm | Shallower marker depth mm | number | Required |
| olderMarkerYear | Older marker year | number | Required |
| youngerMarkerYear | Younger marker year | number | Required |
Enter nonnegative depths, safe-integer years with deeper≥shallower and younger>older. Return mm/year; zero thickness difference is allowed.
rate=(deeperDepth−shallowerDepth)/(youngerYear−olderYear) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| observedMeanSedimentAccumulationMmYear | Observed mean sediment accumulation mm year | number |
{
"input": {
"deeperMarkerDepthMm": 100,
"shallowerMarkerDepthMm": 50,
"olderMarkerYear": 1950,
"youngerMarkerYear": 2000
},
"output": {
"observedMeanSedimentAccumulationMmYear": 1
}
}Limitations and assumptions
No radionuclide inversion, compaction, mass accumulation or extrapolated uniform deposition is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Cesium 137 Peak Year Marker Lookup: A measured Cs-137 peak can mark a core depth only when it is uniquely resolved. The calendar assignment needs independent justification. For a complementary task, use Sediment Focusing Factor Calculator: Core radionuclide inventory may differ from an independently justified atmospheric reference. Their ratio is an apparent focusing measure.
References
Similar or alternative tools
- Cesium 137 Peak Year Marker Lookup
A measured Cs-137 peak can mark a core depth only when it is uniquely resolved. The calendar assignment needs independent justification.
- Sediment Focusing Factor Calculator
Core radionuclide inventory may differ from an independently justified atmospheric reference. Their ratio is an apparent focusing measure.