Spring Turnover Trigger Temperature Checker
Screen sampled near-isothermal ice-free water against explicit caller spring turnover temperature/spread tolerance; temperature similarity does not prove mixing, adequate wind or complete water-column coverage.
Description
Near-isothermal temperature evidence can identify a spring-turnover candidate.
Near-isothermal temperature evidence can identify a spring-turnover candidate. Ice status and sampled reference proximity are additional gates.1
Enter at least two temperatures0–40°C, finite reference, nonnegative tolerances and ice-cover flag. Return spread, proximity flag and candidate flag.
When to use Spring Turnover Trigger Temperature Checker
Use Spring Turnover Trigger Temperature Checker when you need to evaluate the supplied records under the calculation and evidence rules below. Similarity does not prove mixing, adequate wind or complete depth coverage; no universal trigger temperature is supplied.
Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
How to use Spring Turnover Trigger Temperature Checker and understand its results
- Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
- Enter observedWaterTemperaturesC, callerIsothermalSpreadToleranceC, callerTurnoverReferenceTemperatureC, callerReferenceToleranceC, iceCoverStillPresent using the field table and calculation rules, then run the tool.
- Read observedColumnTemperatureSpreadC, nearCallerReferenceTemperature, isothermalIceFreeTurnoverCandidate. 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 |
|---|---|---|---|
| observedWaterTemperaturesC | Observed water temperatures c | list of number | Required |
| callerIsothermalSpreadToleranceC | Caller isothermal spread tolerance c | number | Required |
| callerTurnoverReferenceTemperatureC | Caller turnover reference temperature c | number | Required |
| callerReferenceToleranceC | Caller reference tolerance c | number | Required |
| iceCoverStillPresent | Ice cover still present | boolean | Required |
Enter at least two temperatures0–40°C, finite reference, nonnegative tolerances and ice-cover flag. Return spread, proximity flag and candidate flag.
candidate=iceFree AND all abs(temperature−reference)≤referenceTolerance AND spread≤spreadTolerance Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| observedColumnTemperatureSpreadC | Observed column temperature spread c | number |
| nearCallerReferenceTemperature | Near caller reference temperature | boolean |
| isothermalIceFreeTurnoverCandidate | Isothermal ice free turnover candidate | boolean |
{
"input": {
"observedWaterTemperaturesC": [
3.9,
4,
4.1
],
"callerIsothermalSpreadToleranceC": 0.3,
"callerTurnoverReferenceTemperatureC": 4,
"callerReferenceToleranceC": 0.2,
"iceCoverStillPresent": false
},
"output": {
"observedColumnTemperatureSpreadC": 0.19999999999999973,
"nearCallerReferenceTemperature": true,
"isothermalIceFreeTurnoverCandidate": true
}
}Limitations and assumptions
Similarity does not prove mixing, adequate wind or complete depth coverage; no universal trigger temperature is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Inverse Stratification Under Ice Checker: Under-ice inverse temperature evidence requires sampled warming with depth within 0–4°C. Measurement tolerance determines resolved change. For a complementary task, use Relative Thermal Resistance Mixing Calculator: Relative thermal resistance normalizes a density contrast by a declared reference contrast. Its sign retains stable versus reversed ordering.
References
Similar or alternative tools
- Inverse Stratification Under Ice Checker
Under-ice inverse temperature evidence requires sampled warming with depth within 0–4°C. Measurement tolerance determines resolved change.
- Relative Thermal Resistance Mixing Calculator
Relative thermal resistance normalizes a density contrast by a declared reference contrast. Its sign retains stable versus reversed ordering.