How does descending air at the 30 degrees north and south regions become warmer?

Answer 1

Descending air at the 30 degrees north and south regions becomes warmer due to the adiabatic heating process. As the air descends, it experiences increased pressure, which compresses the air and raises its temperature. Additionally, this descent is part of the Hadley cell circulation, where warm air rises near the equator, cools, and then sinks at around 30 degrees latitude, contributing to the warm, dry conditions typical of these subtropical regions.