Question:
Which of the followings is not a method of computing water balance in Thornthwaite's 1948 systems?
Which of the followings is not a method of computing water balance in Thornthwaite's 1948 systems?
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Thornthwaite's 1948 system is entirely built on Potential Evapotranspiration (PET) as a metric for both thermal efficiency and moisture indices.
Updated On: Jul 6, 2026
- Moisture index
- Humidity index
- Seasonal rainfall variation
- Thermal efficiency index
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
C.W. Thornthwaite's 1948 climate classification system is based on the concept of Potential Evapotranspiration (PET) and water balance parameters.
Step 2: Detailed Explanation:
The Thornthwaite (1948) classification relies on four key indices computed from climatic data:
1. Moisture Index (\(I_m\)): Derived from the balance between water surplus and water deficit relative to PET.
2. Humidity Index (\(I_h\)): The ratio of water surplus to PET.
3. Aridity Index (\(I_a\)): The ratio of water deficit to PET.
4. Thermal Efficiency Index: Represented directly by PET in centimeters.
- Seasonal rainfall variation is not a computed water balance index or direct classification metric under Thornthwaite's 1948 system, which uses seasonal moisture adequacy/distribution rather than raw seasonal rainfall variation.
Step 3: Final Answer:
Seasonal rainfall variation is not a method/index in Thornthwaite's 1948 classification.
C.W. Thornthwaite's 1948 climate classification system is based on the concept of Potential Evapotranspiration (PET) and water balance parameters.
Step 2: Detailed Explanation:
The Thornthwaite (1948) classification relies on four key indices computed from climatic data:
1. Moisture Index (\(I_m\)): Derived from the balance between water surplus and water deficit relative to PET.
2. Humidity Index (\(I_h\)): The ratio of water surplus to PET.
3. Aridity Index (\(I_a\)): The ratio of water deficit to PET.
4. Thermal Efficiency Index: Represented directly by PET in centimeters.
- Seasonal rainfall variation is not a computed water balance index or direct classification metric under Thornthwaite's 1948 system, which uses seasonal moisture adequacy/distribution rather than raw seasonal rainfall variation.
Step 3: Final Answer:
Seasonal rainfall variation is not a method/index in Thornthwaite's 1948 classification.
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