Global Hazards

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Global Hazards:

There are 3 cells in the global circulation syetem, the Hadley cell, Ferrel cell and the Polar cell.

Hadley cell- When warm air rises to the equator and travels North around the Earth where it cools and sinks to the surface. After this it returns to the tropics. This is the bottom cell and it is closest to the equator. It is between 0-30 degrees North and South of the equator.

Ferrel cell- This is the middle cell. It is between the Polar and Hadley cel. This powers the other 2 cells as it is thermally indirect meaning there is high pressure at the North of the equator and it sinks to create low pressure. It is between 30-60 degrees North of South of the equator 

Polar cell- A thermally direct cell meaning when cold air( low pressure) sinks at the North pole, before flowing South it sinks and creates high pressure. It is above 60 degrees of the equator.

Corroilis effect- When the Earth moving creates wind.  The diagram shows how this is laid outAs air is heated it expands and rises, leaving low pressure. In areas where the air is cool it is more dense and falls to the surface of the Earth, creating areas of high pressure.

Air pressure- The force of the air on the surface of the Earth. This is usually measured in millibars. Low pressure usually has 980 millibars while high pressure has 1050 millibars.

Where the warm air rises it creates an area of low pressure whereas where the cooler air sinks it creates an area of high pressure.

Between the Ferrel and Hadley cell, there is high pressure

Between the Ferrel and Polar cell, there is low pressure

Air pressure determines how our weather is.

If we have high pressure, there will be good weather while having low pressure will make bad weather.

Warm air rising will create low pressure while cold air falling creates high pressure. 

Converging air is when warm air rises to make low pressure. This is known as cyclone.

Diverging air

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