Residual Flux Mass Balance Checker
Audit a bounded glacier mass-control-volume budget against independent observed storage change; residual sign is observed minus predicted and missing processes are not diagnosed.
Description
A glacier mass budget balances accumulation, ablation, gate exchange and storage change.
A glacier mass budget balances accumulation, ablation, gate exchange and storage change. The residual measures how far the observed storage change differs from that budget.1
Audit a bounded glacier mass-control-volume budget against independent observed storage change; residual sign is observed minus predicted and missing processes are not diagnosed.
When to use Residual Flux Mass Balance Checker
Use this for the following task: Audit a bounded glacier mass-control-volume budget against independent observed storage change; residual sign is observed minus predicted and missing processes are not diagnosed.
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 Residual Flux Mass Balance Checker 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 accumulationKgPerYear, ablationKgPerYear, inwardGateFluxKgPerYear, outwardGateFluxKgPerYear, observedStorageChangeKgPerYear, closureToleranceKgPerYear using the field table, then run the tool.
- Read predictedStorageChangeKgPerYear, budgetResidualKgPerYear, withinClosureTolerance. 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 |
|---|---|---|---|
| accumulationKgPerYear | Accumulation kg per year | number | Required |
| ablationKgPerYear | Ablation kg per year | number | Required |
| inwardGateFluxKgPerYear | Inward gate flux kg per year | number | Required |
| outwardGateFluxKgPerYear | Outward gate flux kg per year | number | Required |
| observedStorageChangeKgPerYear | Observed storage change kg per year | number | Required |
| closureToleranceKgPerYear | Closure tolerance kg per year | number | Required |
Supply nonnegative gross fluxes and tolerance, with signed observed storage change. Compare the absolute residual inclusively with the tolerance.2
predicted = accumulation − ablation + inward − outward; residual = observed − predicted This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.
| Output field | Meaning | Value type |
|---|---|---|
| predictedStorageChangeKgPerYear | Predicted storage change kg per year | number |
| budgetResidualKgPerYear | Budget residual kg per year | number |
| withinClosureTolerance | Within closure tolerance | boolean |
{
"input": {
"accumulationKgPerYear": 100,
"ablationKgPerYear": 80,
"inwardGateFluxKgPerYear": 10,
"outwardGateFluxKgPerYear": 40,
"observedStorageChangeKgPerYear": -5,
"closureToleranceKgPerYear": 1
},
"output": {
"predictedStorageChangeKgPerYear": -10,
"budgetResidualKgPerYear": 5,
"withinClosureTolerance": false
}
}Limitations and assumptions
Closure is a numerical budget check, not proof that every measurement is correct. Terms must cover the same region and year.
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 Annual Mass Balance for this operation: Area-weight annual accumulation minus ablation over matched nonoverlapping glacier zones; quantities are water equivalent and negative balances are preserved. For a complementary task, use Flux Gate Discharge for this operation: Integrate signed normal ice flux over supplied gate strips with depth-mean/surface velocity calibration; widths are physical section measurements, not geodesy coordinates.
Further background: Glacier accumulation, ablation and mass balance.
References
Similar or alternative tools
- Annual Mass Balance
Area-weight annual accumulation minus ablation over matched nonoverlapping glacier zones; quantities are water equivalent and negative balances are preserved.
- Flux Gate Discharge
Integrate signed normal ice flux over supplied gate strips with depth-mean/surface velocity calibration; widths are physical section measurements, not geodesy coordinates.