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Wind

Wind. John Harris - Head of Geography - Radley College - UK mjh@radley.org.uk http://atschool.eduweb.co.uk/radgeog/. The earth’s atmosphere is composed of 4 layers. Thermosphere Mesosphere Stratosphere Troposphere.

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Wind

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  1. Wind John Harris - Head of Geography - Radley College - UK mjh@radley.org.uk http://atschool.eduweb.co.uk/radgeog/

  2. The earth’s atmosphere is composed of 4 layers • Thermosphere • Mesosphere • Stratosphere • Troposphere

  3. The earth’s weather takes place in the lowest level called the Troposphere

  4. Air rises over warm areas and sinks over cold areas Air rises in warm regions where pressure is low (convection) eg the tropics Air descends in cold areas where pressure is high (subsidence) eg the poles

  5. Global winds Wind is the movement of air from regions of high pressure to regions of low pressure

  6. Winds deflect! Winds do not blow directly from high to low pressure …. they get deflected by the Coriolis force

  7. Winds blow in to lows • Winds blow anti-clockwise and in towards areas of low pressure. • Winds blow clockwise and out from areas of high pressure.

  8. Wind speed! The bigger the difference in pressure (pressure gradient) the stronger the wind

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