ELA Depression Climate Warming
Evaluate a supplied linear temperature/precipitation ELA perturbation model; signed changes and calibration coefficients are retained, not a universal climate lapse-rate rule.
Description
Changes in temperature and precipitation can shift the equilibrium-line altitude.
Changes in temperature and precipitation can shift the equilibrium-line altitude. A linear perturbation model expresses the shift through supplied sensitivities.1
Evaluate a supplied linear temperature/precipitation ELA perturbation model; signed changes and calibration coefficients are retained, not a universal climate lapse-rate rule.
When to use ELA Depression Climate Warming
Use this for the following task: Evaluate a supplied linear temperature/precipitation ELA perturbation model; signed changes and calibration coefficients are retained, not a universal climate lapse-rate rule.
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 ELA Depression Climate Warming 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 baselineElaM, temperatureChangeC, precipitationChangeFraction, temperatureSensitivityMetersPerC, precipitationSensitivityMetersPerFraction using the field table, then run the tool.
- Read predictedElaChangeM, predictedElaM. 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 |
|---|---|---|---|
| baselineElaM | Baseline ela m | number | Required |
| temperatureChangeC | Temperature change c | number | Required |
| precipitationChangeFraction | Precipitation change fraction | number | Required |
| temperatureSensitivityMetersPerC | Temperature sensitivity meters per c | number | Required |
| precipitationSensitivityMetersPerFraction | Precipitation sensitivity meters per fraction | number | Required |
Preserve signed changes and calibration coefficients, rejecting precipitation reductions below −1. Add the predicted shift to the baseline ELA.2
ΔELA = ΔT temperatureSensitivity + ΔprecipitationFraction precipitationSensitivity This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.
| Output field | Meaning | Value type |
|---|---|---|
| predictedElaChangeM | Predicted ela change m | number |
| predictedElaM | Predicted ela m | number |
{
"input": {
"baselineElaM": 2000,
"temperatureChangeC": 1,
"precipitationChangeFraction": 0.1,
"temperatureSensitivityMetersPerC": 100,
"precipitationSensitivityMetersPerFraction": -200
},
"output": {
"predictedElaChangeM": 80,
"predictedElaM": 2080
}
}Limitations and assumptions
This is a supplied local model, not a universal climate lapse-rate rule or fitted climate projection.
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 Equilibrium Line Altitude ELA for this operation: Find the unique observed zero of a piecewise-linear altitude/net-balance profile; missing and multiple equilibrium lines are not extrapolated or arbitrarily selected. For a complementary task, use Accumulation Area Ratio AAR for this operation: Estimate AAR above a supplied ELA with area uniform within each elevation band; nonuniform hypsometry and transient snowline differences are external.
Further background: Glacier accumulation, ablation and mass balance.
References
Similar or alternative tools
- Equilibrium Line Altitude ELA
Find the unique observed zero of a piecewise-linear altitude/net-balance profile; missing and multiple equilibrium lines are not extrapolated or arbitrarily selected.
- Accumulation Area Ratio AAR
Estimate AAR above a supplied ELA with area uniform within each elevation band; nonuniform hypsometry and transient snowline differences are external.