Surface Lowering Mass Loss Calculator
Convert observed lowering after explicit non-mass compaction correction to signed mass loss; no geodesy transform, firn-density inference or automatic claim every height change is mass loss.
Description
Surface lowering includes possible non-mass compaction.
Surface lowering includes possible non-mass compaction. An explicit correction is needed before converting height change to mass.1
Enter finite signed lowering/compaction, nonnegative area and positive loss density. Return corrected meters and signed kg.
When to use Surface Lowering Mass Loss Calculator
Use Surface Lowering Mass Loss Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Negative loss is retained. No datum transform, firn-density inference or automatic mass-loss attribution is supplied.
Prepare the observed ice, snow, water or geometry measurements and explicit calibration parameters requested. Keep coordinates, datum, density and time units consistent.
How to use Surface Lowering Mass Loss Calculator and understand its results
- Prepare the observed ice, snow, water or geometry measurements and explicit calibration parameters requested. Keep coordinates, datum, density and time units consistent.
- Enter surfaceLoweringM, nonMassRelatedCompactionM, observedAreaM2, lossDensityKgM3 using the field table and calculation rules, then run the tool.
- Read compactionCorrectedLoweringM, signedMassLossKg. 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 |
|---|---|---|---|
| surfaceLoweringM | Surface lowering m | number | Required |
| nonMassRelatedCompactionM | Non mass related compaction m | number | Required |
| observedAreaM2 | Observed area m2 | number | Required |
| lossDensityKgM3 | Loss density kg m3 | number | Required |
Enter finite signed lowering/compaction, nonnegative area and positive loss density. Return corrected meters and signed kg.
corrected=lowering−compaction; massLoss=corrected×area×density Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| compactionCorrectedLoweringM | Compaction corrected lowering m | number |
| signedMassLossKg | Signed mass loss kg | number |
{
"input": {
"surfaceLoweringM": 2,
"nonMassRelatedCompactionM": 0.5,
"observedAreaM2": 100,
"lossDensityKgM3": 900
},
"output": {
"compactionCorrectedLoweringM": 1.5,
"signedMassLossKg": 135000
}
}Limitations and assumptions
Negative loss is retained. No datum transform, firn-density inference or automatic mass-loss attribution 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 Water Equivalent Snow Depth Calculator: Snow water equivalent expresses a measured snow-core mass as a water depth. Core area and tare correction determine its measurement basis. For a complementary task, use Ice Cliff Mass Loss Per Year Calculator: Face-normal backwasting times actual cliff-face area gives a signed volume-loss rate. Projected horizontal area has a different meaning.
References
-
Surface Lowering Mass Loss Calculator — tool.io
Similar or alternative tools
- Water Equivalent Snow Depth Calculator
Snow water equivalent expresses a measured snow-core mass as a water depth. Core area and tare correction determine its measurement basis.
- Ice Cliff Mass Loss Per Year Calculator
Face-normal backwasting times actual cliff-face area gives a signed volume-loss rate. Projected horizontal area has a different meaning.