Thermohydrogram Ratio Classifier

Explicit caller thermohydrogram Pvspositive Tax is ratio and month dryness screen—not Lang annual factor or biological water balance. Caller independently establishes homogeneous observation coverage and model/reference applicability; not observed future climate, crop suitability or validated drought severity.

Description

A thermohydrogram compares precipitation with a scaled temperature-related reference.

A thermohydrogram compares precipitation with a scaled temperature-related reference.^[1]

The scale factor is an independently chosen convention, not an automatic drought calibration. Use Thermohydrogram Ratio Classifier to evaluate the supplied inputs under the model explained below.

When to use Thermohydrogram Ratio Classifier

Use Thermohydrogram Ratio Classifier to evaluate the supplied inputs under the model explained below. Establish the units, measurement scope and model assumptions before entering values.

How to use Thermohydrogram Ratio Classifier and understand its results

Establish the units, measurement scope and model assumptions before entering values.
Enter Monthly temperature c, Monthly precipitation mm, Caller precipitation mm per temperature c using the field table and validation rules below, then run the tool.
Read Monthly signed thermohydrogram reserves mm, Observed dry month count; interpret the units, signs, ordering and unknown-value placeholders described below.
Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.

Input field	Meaning	Value type	Requirement
monthlyTemperatureC	Monthly temperature c	array of number	Required; constraints below
monthlyPrecipitationMm	Monthly precipitation mm	array of number	Required; constraints below
callerPrecipitationMmPerTemperatureC	Caller precipitation mm per temperature c	number	Required; constraints below

Enter twelve January–December finite temperature values in °C and nonnegative precipitation values in mm, plus a positive caller precipitation-per-temperature factor in mm/°C. Compute precipitation minus factor×max(0,temperature) for each month and count strictly negative reserves. Zero reserve is not dry in this check. No factor, climate period or calibrated drought rule is selected.

reserveMm[i]=precipMm[i]−factor×max(0,tempC[i]); dryMonths=count(reserve<0)

Use the field order, units and branch conditions described above.

Output field	Meaning	Value type
monthlySignedThermohydrogramReservesMm	Monthly signed thermohydrogram reserves mm	array of number
observedDryMonthCount	Observed dry month count	number

json

{
  "input": {
    "monthlyTemperatureC": [
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20
    ],
    "monthlyPrecipitationMm": [
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20
    ],
    "callerPrecipitationMmPerTemperatureC": 2
  },
  "output": {
    "monthlySignedThermohydrogramReservesMm": [
      -20,
      -20,
      -20,
      -20,
      -20,
      -20,
      -20,
      -20,
      -20,
      -20,
      -20,
      -20
    ],
    "observedDryMonthCount": 12
  }
}

Limitations and assumptions

The scale factor is an independently chosen convention, not an automatic drought calibration. Apply the exact scope and assumptions explained above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.

Alternative or Complementary methods

Use Lang Rain Factor Calculator for a related task: Lang's rain factor divides annual precipitation by a positive mean temperature.

Use Firbas Humidity Factor Calculator for a related task: A named humidity factor requires an identified method and reference convention.

References

Thermohydrogram Ratio Classifier — tool.io

Similar or alternative tools

Lang Rain Factor Calculator
Lang's rain factor divides annual precipitation by a positive mean temperature.
Firbas Humidity Factor Calculator
A named humidity factor requires an identified method and reference convention.