How does the Hadley cell circulation pattern help create hot deserts?

The Hadley cell is a large-scale atmospheric circulation pattern that plays a primary role in the formation of many of the world's hot deserts.12

The process functions as a direct heat engine:

• Equatorial Ascent: Near the Equator, intense solar heating causes air to rise, expand, and cool. This process leads to condensation and significant precipitation, leaving the air masses depleted of moisture.12
• Poleward Movement: This air travels toward the poles in the upper troposphere.12
• Subtropical Subsidence: Upon reaching approximately 30° latitude, the air cools and descends. As it sinks, the air undergoes compressional warming, which significantly lowers its relative humidity.12
• Arid Conditions: This descending, dry air creates regions of high atmospheric pressure known as subtropical ridges. Because this air is stable and lacks moisture, it inhibits cloud formation and precipitation, resulting in the arid conditions characteristic of major deserts like the Sahara, Kalahari, and Sonoran deserts.132

These deserts are most intensely developed on the western sides of continents, where this subsidence is further enhanced by atmospheric dynamics.34