The effect of high and low pressure on climate
5 Basic principles <ul><li>Air moves from high to low pressure. </li></ul><ul><li>The area close to the equator is an area...
A basic atmospheric cell system <ul><li>If you assume: </li></ul><ul><ul><li>earth is uniformly covered with water </li></...
The Three Cell System This is the pattern of surface winds you would get in a three cell system.  Note in particular the p...
The Three Cell System The first cell to examine is the  Hadley Cell . Air rises at the equator and descends approximately ...
The Three Cell System This is a basic diagram of the three cell system.  Mark on the areas of high and low pressure.
The Three Cell System
How does this cell system effect us on the earth’s surface? <ul><li>Wind direction </li></ul><ul><li>Wind speed </li></ul>...
The relatively warm UK
The relatively wet UK
The world’s deserts and the cell system
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The effect of high and low pressure on

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Hadley Cell, Three Cell System. This powerpoint looks at the

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The effect of high and low pressure on

  1. 1. The effect of high and low pressure on climate
  2. 2. 5 Basic principles <ul><li>Air moves from high to low pressure. </li></ul><ul><li>The area close to the equator is an area of low pressure. </li></ul><ul><li>As air rises it cools and as such it becomes denser. </li></ul><ul><li>Warm air can hold more moisture more comfortably making precipitation less likely. </li></ul><ul><li>The ITCZ (Inter Tropical Convergence Zone) is an area of low pressure where two large air masses meet near the equator. Essentially it is the climatic equator. </li></ul>
  3. 3. A basic atmospheric cell system <ul><li>If you assume: </li></ul><ul><ul><li>earth is uniformly covered with water </li></ul></ul><ul><ul><li>sun is directly over equator </li></ul></ul><ul><ul><li>no rotation </li></ul></ul><ul><ul><li>you will end up with a single-cell pattern -->> </li></ul></ul><ul><ul><ul><li>called the Hadley Cell </li></ul></ul></ul><ul><ul><ul><li>warm air rises at the equator, cold air sinks at the poles </li></ul></ul></ul>but the Earth does rotate!
  4. 4. The Three Cell System This is the pattern of surface winds you would get in a three cell system. Note in particular the position of high and low pressure.
  5. 5. The Three Cell System The first cell to examine is the Hadley Cell . Air rises at the equator and descends approximately 30 degrees N and S of the equator.
  6. 6. The Three Cell System This is a basic diagram of the three cell system. Mark on the areas of high and low pressure.
  7. 7. The Three Cell System
  8. 8. How does this cell system effect us on the earth’s surface? <ul><li>Wind direction </li></ul><ul><li>Wind speed </li></ul><ul><li>For the UK this means warm, south westerly winds which are wet. </li></ul><ul><li>Location of earth’s major ecosystems eg deserts. </li></ul>
  9. 9. The relatively warm UK
  10. 10. The relatively wet UK
  11. 11. The world’s deserts and the cell system

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