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    Question ID:   11453         Current Version: 1
Question: What is climate ratio?
Category: Science > Weather
Keywords: arid, humid, semiarid, subhumid, type, weather, climate ratio
Type: what
Rating:(0 ratings)    Views: 366    Discussions: 0   In Watch Lists: 1  

 
    Answer:

Climate ratio is used to describe the moisture side of climate. It compares the precipitation (P) with the potential evapotranspiration (Ep) for a region. One way to do this is to express the relationship between them as a ratio using the formula:

Climate ratio = P / Ep

When the potential evaporation is greater than yearly precipitation, this ratio is less than 1. When precipitation is greater than evapotranspiration, the ratio is greater than 1. 

  • P: precipitation (in mm) or the amount of moisture available for evapotranspiration, evapotranspiration is the combined process of evaporation and plant respiration.
  • Ep: potential evapotranspiration (in mm) or the amount of moisture needed for evapotranspiration. This value increases as temperature and plant life increase.

The climate ratios are used to determine climate type:

P/Ep:

  • Less than 0.4: arid climate
  • 0.4 - 0.8: semiarid climate
  • 0.8 - 1.2: subhumid climate
  • Greater than 1.2: humid climate 
Source: NOAA
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