global hazards
- Created by: bethsibley
- Created on: 12-05-18 14:20
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- PAPER ONE GEOGRAPHY! Global hazards
- GLOBAL HAZARDS
- Winds move from high to low pressure
- atmospheric circulation
- the equator: air rises as its heated via the sun= low pressure belt = clouds+rain
- at 30 degrees N and S cool air sinks =high pressure belt= cloudless skies =low rainfall
- surface winds blowing towards the equator is called trade winds, when trade winds meet at the eqator they rise= clouds
- 60 degrees N and S warmer winds meet colder air and warmer air is less dense so rises= low pressures
- surface winds blowing towards the equator is called trade winds, when trade winds meet at the eqator they rise= clouds
- at 30 degrees N and S cool air sinks =high pressure belt= cloudless skies =low rainfall
- Polar; low temps all year
- Temperate; moderate summers a low pressure belt rainfall frequent
- Tropical; hot temps high rainfall near equator ( two cells meeting)
- Arid; low rainfall hot temps high pressure prevents rainfall
- Tropical; hot temps high rainfall near equator ( two cells meeting)
- Temperate; moderate summers a low pressure belt rainfall frequent
- Tropical Storms
- sea temps over 27 degrees
- warm air rises =condensation= release of energy= powerful storm rising air causes low pressure and more surface winds
- earths rotaion deflects the path of winds making storms spin
- extreme winds ; caused by low pressure at the centre makimg a presssure difference
- Extreme rain; caused by large amounts of moist air rising, coolimg and condensing
- El Nino
- the reverse of nromal conditions of the pacific ocean
- pressure rises in the west and falls in the east causes trade winds to weaken or reverse
- sinking air in high pressure over the west causes dry weather causing drought in australia
- rising air in low pressure in the east leads to wet conditions causing floods in peru
- sinking air in high pressure over the west causes dry weather causing drought in australia
- La Nina
- More extreme conditions of the normal pacific ocean
- Trade winds blow stringer, more cold water rises in the east
- heavy rainfall and floods in the west and less rainfall/droughts in the east
- Trade winds blow stringer, more cold water rises in the east
- More extreme conditions of the normal pacific ocean
- El Nino
- Extreme rain; caused by large amounts of moist air rising, coolimg and condensing
- extreme winds ; caused by low pressure at the centre makimg a presssure difference
- earths rotaion deflects the path of winds making storms spin
- warm air rises =condensation= release of energy= powerful storm rising air causes low pressure and more surface winds
- sea temps over 27 degrees
- Winds move from high to low pressure
- Droughts
- a long period of time when rainfall is below average
- Changes in atmospheric circulation i.e el nino can be a cause as it can decrease annual rainfall. also caused by high pressure systems
- a long period of time when rainfall is below average
- GLOBAL HAZARDS
- every 3-4 year event
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