Thermal Regime Temperate Polar Checker

Screen measured depth temperatures against pressure melting with caller tolerance; near-melting ice may be temperate, but spatial coverage, impurities and water content are not inferred.

Description

Ice’s melting temperature decreases under pressure.

Ice’s melting temperature decreases under pressure. Comparing measured temperatures with a depth-dependent melting model helps screen for cold and near-melting conditions.

Screen measured depth temperatures against pressure melting with caller tolerance; near-melting ice may be temperate, but spatial coverage, impurities and water content are not inferred.

When to use Thermal Regime Temperate Polar Checker

Use this for the following task: Screen measured depth temperatures against pressure melting with caller tolerance; near-melting ice may be temperate, but spatial coverage, impurities and water content are not inferred.

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 Thermal Regime Temperate Polar 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 depthsM, iceTemperaturesC, iceDensityKgPerM3, gravityMPerSecondSquared, clapeyronKelvinPerPa, comparisonToleranceC using the field table, then run the tool.
Read pressureMeltingTemperaturesC, coldFlags, nearMeltingFlags, aboveModelMeltingFlags. 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
depthsM	Depths m	list of number; each entry: number	Required
iceTemperaturesC	Ice temperatures c	list of number; each entry: number	Required
iceDensityKgPerM3	Ice density kg per m3	number	Required
gravityMPerSecondSquared	Gravity m per second squared	number	Required
clapeyronKelvinPerPa	Clapeyron kelvin per pa	number	Required
comparisonToleranceC	Comparison tolerance c	number	Required

Pair nonnegative depths with temperatures. Return 1/0 flags for offset below −tolerance, absolute offset within tolerance, or above tolerance; equality belongs to near-melting.^[1]

Tm = −βρgz; offset = T − Tm

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

Output field	Meaning	Value type
pressureMeltingTemperaturesC	Pressure melting temperatures c	list of number
coldFlags	Cold flags	list of number
nearMeltingFlags	Near melting flags	list of number
aboveModelMeltingFlags	Above model melting flags	list of number

json

{
  "input": {
    "depthsM": [
      0,
      100
    ],
    "iceTemperaturesC": [
      -10,
      -0.09
    ],
    "iceDensityKgPerM3": 900,
    "gravityMPerSecondSquared": 10,
    "clapeyronKelvinPerPa": 1e-7,
    "comparisonToleranceC": 0.01
  },
  "output": {
    "pressureMeltingTemperaturesC": [
      0,
      -0.09
    ],
    "coldFlags": [
      1,
      0
    ],
    "nearMeltingFlags": [
      0,
      1
    ],
    "aboveModelMeltingFlags": [
      0,
      0
    ]
  }
}

Limitations and assumptions

Near-melting measurements alone do not establish a glacier-wide temperate regime. Impurities, water content and sampling coverage remain external.

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 Pressure Melting Point Depth for this operation: Compute linear pressure-melting depression from ice overburden with supplied Clapeyron slope; solute and gas effects are excluded. For a complementary task, use Geothermal Flux Basal Melt for this operation: Convert net geothermal-minus-conductive basal heat to signed ice melt under pressure-melting conditions; negative flux represents freezing potential, not guaranteed actual freezing.

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

References

Thermal Regime Temperate Polar Checker — tool.io

Similar or alternative tools

Pressure Melting Point Depth
Compute linear pressure-melting depression from ice overburden with supplied Clapeyron slope; solute and gas effects are excluded.
Geothermal Flux Basal Melt
Convert net geothermal-minus-conductive basal heat to signed ice melt under pressure-melting conditions; negative flux represents freezing potential, not guaranteed actual freezing.