Summary of What is global circulation? | Part Two | The three cells

Summary of Global Circulation

The video explains the concept of Global Circulation and its three-cell pattern, which redistributes heat across the Earth. Key points include:

Heat Distribution: The equator receives more solar heat than the poles, necessitating a heat redistribution mechanism.
Circulation Cells:
- Hadley Cells:
  - Located at the equator.
  - Warm, less dense air rises to about 18 kilometers and spreads out beneath the tropopause.
  - As the air moves toward the poles, it cools and sinks, eventually returning to the equator.
- Ferrel Cells:
  - Positioned between the Hadley and Polar Cells.
  - They flow in the opposite direction to the Hadley and Polar Cells and are not driven by temperature.
- Polar Cells:
  - Found in the polar regions.
  - Cold, dense air descends and flows at low levels toward 60 to 70 degrees north or south.
  - As the air warms, it rises and returns to the poles at higher altitudes.
Pressure Systems:
- Rising air creates low-pressure areas, leading to increased rainfall (e.g., rainforests near the equator).
- Descending air forms high-pressure areas, resulting in clear skies and deserts (e.g., Antarctica and the Sahara).
Climatic Zones: The interaction of these cells results in various Climatic Zones, influencing weather patterns around the globe.