Geography • Physical GeographyHard
Which of the following intricate thermodynamic processes explains the formation of chinook winds descending the eastern slopes of the Rocky Mountains in North America?
A. Isothermal expansion driven by surface radiational cooling over high plateaus
B. Forced mechanical ascent of maritime air resulting in adiabatic cooling and persistent frontal precipitation
C. Frictional convergence of trade winds along sub-polar low-pressure convergence belts
D. Orographic precipitation on the windward side causing latent heat release, followed by adiabatic warming at the dry rate on the leeward descent✓ Correct Answer
💡 Solution & Explanation
Chinook winds are warm, dry Föhn-type winds that descend the lee slopes of mountain ranges. As moist air ascends the windward side, it cools at the moist adiabatic rate, releasing latent heat of condensation through precipitation. Upon descending the leeward side, the air warms at the higher dry adiabatic rate, resulting in temperatures significantly higher than at the same elevation on the windward side. These winds can rapidly melt winter snow cover across the Great Plains.
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