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Difficulty: MediumClimatic Controls and World Climate Types

As moist air masses ascend the windward slopes of a major mountain barrier, they cool adiabatically and deposit heavy precipitation. As the air descends on the opposite side, it warms adiabatically and absorbs moisture, resulting in arid or semi-arid conditions. Which climatic control and associated phenomenon are responsible for the dry climate on the leeward side?

  1. Relief acting as a climatic barrier to produce a rain-shadow zoneAnswer
  2. B
    Continentality driving an extreme annual thermal amplitude
  3. C
    Cold ocean currents inducing a surface temperature inversion
  4. D
    Latitude controlling the angle of solar insolation along the slope

Answer

Relief acting as a climatic barrier to produce a rain-shadow zone
Relief serves as a major climatic control. When moist air encounters a mountain range, it is forced to ascend, cooling at the adiabatic lapse rate and releasing rain on the windward slope. Upon crossing the crest, the air descends the leeward side, warming adiabatically. This dry, warm descending air creates a dry belt known as a rain-shadow region.

Step-by-Step Solution

1
Analyze the physical process described in the stem
Air ascends windward slopes (orographic uplift), cools adiabatically, condenses, and precipitates, leaving dry air to descend the leeward slope.
Topography (relief) physically intercepts air masses.
2
Identify the climatic control and resultant feature
The climatic control is relief (orography) and the feature created on the sheltered leeward side is a rain-shadow zone.
Desiccated air warming adiabatically on the leeward side suppresses cloud formation and precipitation.

Key Concept

Relief and Orographic Rain-Shadow Effect
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Topics

Climatic Controls and World Climate Types

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