Annual Layer Count Age At Depth

Accumulate interpreted annual-layer counts and separately supplied hiatus years at depth boundaries; ambiguous/missing annuality must be resolved externally.

Description

Interpreted annual layers supply elapsed years between depth boundaries.

Interpreted annual layers supply elapsed years between depth boundaries. Hiatus years must be added separately when a period has no preserved layer record.

Accumulate interpreted annual-layer counts and separately supplied hiatus years at depth boundaries; ambiguous/missing annuality must be resolved externally.

When to use Annual Layer Count Age At Depth

Use this for the following task: Accumulate interpreted annual-layer counts and separately supplied hiatus years at depth boundaries; ambiguous/missing annuality must be resolved externally.

Prepare the measurements and calibration parameters in the declared units. Keep vector entries aligned and choose a consistent spatial frame and time basis.

How to use Annual Layer Count Age At Depth and understand its results

Prepare the measurements and calibration parameters in the declared units. Keep vector entries aligned and choose a consistent spatial frame and time basis.
Enter boundaryDepthsM, annualLayersPerInterval, hiatusYearsPerInterval, surfaceAgeYears using the field table, then run the tool.
Read agesAtBoundariesYears. Interpret flags, units, ordering and placeholder values using the rules below.
Review any reported issue or failed check, correct the supplied values when appropriate, and verify the result in its intended context.

Input field	Meaning	Value type and bounds	Requirement
boundaryDepthsM	Boundary depths m	list of number; each entry: number	Required
annualLayersPerInterval	Annual layers per interval	list of number; each entry: number	Required
hiatusYearsPerInterval	Hiatus years per interval	list of number; each entry: number	Required
surfaceAgeYears	Surface age years	number	Required

Use ordered nonnegative boundary depths, one fewer interval counts, aligned hiatus values and nonnegative starting age. Return cumulative ages including the first boundary.^[1]

age[i+1] = age[i] + annualLayers[i] + hiatusYears[i]

This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.

Output field	Meaning	Value type
agesAtBoundariesYears	Ages at boundaries years	list of number

json

{
  "input": {
    "boundaryDepthsM": [
      0,
      1,
      2
    ],
    "annualLayersPerInterval": [
      10,
      20
    ],
    "hiatusYearsPerInterval": [
      0,
      5
    ],
    "surfaceAgeYears": 0
  },
  "output": {
    "agesAtBoundariesYears": [
      0,
      10,
      35
    ]
  }
}

Limitations and assumptions

The tool does not identify layers or resolve missing/ambiguous annuality; those interpretations are inputs.

Constants and empirical coefficients are supplied rather than calibrated. Check units and observational applicability before interpreting the model. Malformed requests produce input errors. A successfully evaluated request can still contain false flags, empty result lists or a result outside the supplied threshold; those outcomes have the meanings stated above.

Alternative or Complementary methods

Choose Core Bottom Age Extrapolation for this operation: Integrate reciprocal exponentially thinning annual-layer thickness below a reference depth; explicitly a model extrapolation, not observed core chronology or an uncertainty bound. For a complementary task, use Ice Core Layer Thinning Depth for this operation: Propagate layer thickness through supplied vertical-strain residence intervals; negative strain thins and positive strain thickens, without inferring strain from depth.

The implementation reference documents the exact calculation, supported input shapes and returned fields.

References

Annual Layer Count Age At Depth — tool.io

Similar or alternative tools

Core Bottom Age Extrapolation
Integrate reciprocal exponentially thinning annual-layer thickness below a reference depth; explicitly a model extrapolation, not observed core chronology or an uncertainty bound.
Ice Core Layer Thinning Depth
Propagate layer thickness through supplied vertical-strain residence intervals; negative strain thins and positive strain thickens, without inferring strain from depth.