GED Science TestEarth and Space ScienceMedium
A climatologist is analyzing long-term climate data for a desert region. They observe that the region experiences very little precipitation throughout the year and has significant temperature differences between day and night. Which atmospheric circulation cell is primarily responsible for the aridity of this region?
- AWalker Circulation
- BPolar Cell
- CHadley Cell
- DFerrel Cell
Show answer & explanationAnswer & explanation
Correct answer: C. Hadley Cell
The Hadley Cell is characterized by rising air at the equator (leading to precipitation) and sinking, dry air at approximately 30 degrees latitude, which creates subtropical high-pressure zones and deserts.
Why the other options are wrong
- A. Walker Circulation is an east-west atmospheric circulation in the equatorial Pacific, not a global north-south cell responsible for desert formation.
- B. The Polar Cell operates near the poles and is associated with cold, dry conditions, but not the deserts at mid-latitudes.
- D. The Ferrel Cell is a mid-latitude cell that helps drive weather patterns but is not directly responsible for the aridity of subtropical deserts.
Hadley Cell
A large-scale atmospheric convection cell that circulates air from the equator to approximately 30 degrees latitude, playing a crucial role in global climate patterns and the formation of subtropical deserts.
- Air rises at the equator, creating low pressure and rain.
- Air moves poleward in the upper atmosphere.
- Air sinks at ~30° latitude, creating high pressure and dry conditions.
Memory trick: Circulation Cells Rule Global Weather Patterns