Crater Lake Temperature Anomaly Checker

Monitor matched lake/reference temperature differences after a caller seasonal baseline contrast; flags are data anomalies, not evidence of volcanic heating or eruption risk.

Description

A lake-reference temperature contrast helps remove shared environmental variation.

A lake-reference temperature contrast helps remove shared environmental variation. Subtracting a baseline isolates departures from that expected contrast.

Monitor matched lake/reference temperature differences after a caller seasonal baseline contrast; flags are data anomalies, not evidence of volcanic heating or eruption risk.

When to use Crater Lake Temperature Anomaly Checker

Use this tool to monitor matched lake/reference temperature differences after a caller seasonal baseline contrast; flags are data anomalies, not evidence of volcanic heating or eruption risk.

Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.

How to use Crater Lake Temperature Anomaly Checker and understand its results

Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
Enter lakeTemperaturesC, referenceTemperaturesC, baselineLakeReferenceDifferenceC, callerMaximumExcessC using the field table and calculation rules, then run the tool.
Read baselineCorrectedLakeAnomaliesC, aboveCallerExcessFlags. 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
lakeTemperaturesC	Lake temperatures c	list of number	Required
referenceTemperaturesC	Reference temperatures c	list of number	Required
baselineLakeReferenceDifferenceC	Baseline lake reference difference c	number	Required
callerMaximumExcessC	Caller maximum excess c	number	Required

Align the two Celsius series and supply a nonnegative maximum excess. Return anomalies and flags only for values strictly above that maximum; negative anomalies are preserved.^[1]

Paired lists must be nonempty and have equal lengths.

anomaly = lake temperature − reference temperature − baseline contrast

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
baselineCorrectedLakeAnomaliesC	Baseline corrected lake anomalies c	list of number
aboveCallerExcessFlags	Above caller excess flags	list of number

json

{
  "input": {
    "lakeTemperaturesC": [
      30,
      32,
      35
    ],
    "referenceTemperaturesC": [
      20,
      22,
      23
    ],
    "baselineLakeReferenceDifferenceC": 10,
    "callerMaximumExcessC": 1
  },
  "output": {
    "baselineCorrectedLakeAnomaliesC": [
      0,
      0,
      2
    ],
    "aboveCallerExcessFlags": [
      0,
      0,
      1
    ]
  }
}

Limitations and assumptions

A temperature anomaly does not establish volcanic heating or eruption risk.

Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Fumarole Temperature Trend Monitoring Tool: Monitor thermometer-calibration-corrected fumarole temperature trend with explicitly linear comparison-time extrapolation; signed slopes/past crossing are retained, and gas-source/eruption attribution is not made. For a complementary task, use Thermal Camera Hotspot Area Growth Tracker: Track thresholded physical area and temperature-excess area from calibrated thermal pixels; strict threshold equality is excluded, and emissivity/atmospheric correction or mapped coordinates are caller preprocessing.

References

Crater Lake Temperature Anomaly Checker — tool.io

Similar or alternative tools

Fumarole Temperature Trend Monitoring Tool
Monitor thermometer-calibration-corrected fumarole temperature trend with explicitly linear comparison-time extrapolation; signed slopes/past crossing are retained, and gas-source/eruption attribution is not made.
Thermal Camera Hotspot Area Growth Tracker
Track thresholded physical area and temperature-excess area from calibrated thermal pixels; strict threshold equality is excluded, and emissivity/atmospheric correction or mapped coordinates are caller preprocessing.