Global Hazards: Factors affecting global temperatures 

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  • Global Hazards: Factors affecting global temperatures
    • INSOLATION
      • The solar radiation that reaches the earths surface
        • The more insolation the higher the temperature
      • The strongest insolation is received at NOON
      • factors affecting insolation:
        • angle of sun
        • Duration of daylight
        • distance between sun & earth
    • LAND AND SEA
      • At the sea, insolation reaches DEEPER because sea is transparent
        • Although it takes longer to heat up than land, the sea will retain heat for longer
    • OCEAN CURRENTS
      • Ocean currents move heat easily - water is fluid
    • CLOUD COVER
      • A percentage of the atmosphere is covered in cloud
        • Clouds reflect the suns rays
        • At the tropics, the higher air pressure leads to a lack of cloud cover, meaning temperatures can be higher
    • ALBEDO EFFECT
      • How much a surface reflects or absorbs the suns rays
      • It is represented as a percentage
        • An Albedo of 1 would mean 100% of incoming radiation is reflected
          • E.G polar ice has a high albedo, reflecting more heat and making the poles colder
    • ALTITUDE
      • As you go up the air pressure decreases, meaning that the air is less able to retain heat, making temperatures COLDER
      • height
      • for every 100m of altitude, temp decreses by 1%
  • 6 factors:
    • Insolation
    • Albedo
    • Altitude
    • Cloud cover
    • Ocean current
    • land & sea

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