Discussion
Consider the following statements comparing Koppen and Thornthwaite.
1. Koppen uses vegetation related thresholds on temperature and rainfall.
2. Thornthwaite uses a computed water balance.
3. The two give identical maps of the world.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 correctly separate the two approaches: Koppen uses vegetation-related thresholds on temperature and rainfall, Thornthwaite a computed water balance. Statement 3 is wrong - because they measure different things, the maps differ appreciably, particularly at the margins of the dry regions where Thornthwaite’s evapotranspiration calculation and Koppen’s aridity threshold disagree.
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