What is global atmospheric circulation? How does the global atmospheric circulation model work?
This is the twelfth video for the AQA GCSE 9-1 Geography course, and the twelfth video of the Challenge of Natural Hazards topic.
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Video Script:
The air in the Earth’s atmosphere moves in response to differences in temperature. This movement of air is known as global atmospheric circulation.
The Equator is the hottest part of Earth. Air rises here, creating low pressure. As it rises it becomes cooler and condenses, which forms clouds and leads to rainfall. This is where tropical rainforests are found.
When the air reaches the top of the atmosphere it can’t go any further so splits and travels north and south. The air cools and sinks, creating high pressure. This happens at around 30° north and south of the equator. This is where deserts are found.
Air rises again at around 60° north and south, and descends again at the poles, which is around 90° north and south.
The global atmospheric circulation model features three different cells. The Hadley cell is between the equator and 30° north and south. The Ferrel cell is between 30 and 60° north and south. And finally the Polar cell is between 60° north and south and 90° north and south.
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GCSE Geography
24/06/2022
Keducate
