Geography hazards paper one

• What is global atmospheric circulation?

  Worldwide system of winds which transport heat tropical-polar latitudes.
• Air Pressure


  The pressure exerted by the weight of air in the atmosphere of Earth
• Winds blow


  From high pressure zones to low pressure zones
• High Pressure (Anticyclone)


  • Brings Cloudless, Sunny weather
• Low Pressure (Cyclone)


  • Brings cloudy skies & rainfall
• High Pressure


  Diverging air
• Low Pressure


  Converging air
• Air that is sinking towards the ground surface forms areas of high pressure, e.g. at the North Pole. Winds on the ground move outwards from these areas. [High pressure = lots of air pressing down on the ground]
• Air that is rising from the ground surface forms areas of low pressure on the ground, eg. at the Equator. Winds on the ground move towards these areas of low pressure. [Low pressure = not much air pressing down on the ground]
• Tropic of Cancer-Higher pressure air


  Sinking. The air warms up.
• What is air pressure?

  The pressure exerted by the weight of air in the atmosphere of earth
• What is a tropical storm?


  Areas of low pressure with winds moving in a spiral around the calm (the eye)

  •winds powerful (74mph)

  • rain is heavy and strong

  • Ocean temp must be 37*C+
• Area where apical s
• Over 27
• noong Tropical storms.
• Spread out
• along a narrow
• North & South of the
• equator. Between 8 + 20°
• North $
• 27°C+. Hurricanes effect
• America. Typhoons effect Asia
• Tropical Cyclones effect Africa etc.