Causes Of Climate Change
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Causes Of Climate Change

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Climate Change Causes for AS students

Climate Change Causes for AS students

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Causes Of Climate Change Causes Of Climate Change Presentation Transcript

  • Are they Human or Natural?
    Are they Cooling or Warming?
    Causes of climate change
  • The earth’s rotation and orbit
    As the earth orbits the sun, it wobbles slightly on its axis. These “wobbles” are named after Milankovitch who discovered them.
    In the past the Milankovitch cycles have coincided with ice ages.
    http://www.wwnorton.com/college/geo/egeo/flash/18_2.swf
    Natural
    Human
    Cooling
    Warming
  • El Nino
    Occurs in the Pacific Ocean, where the normal circulation slows, stops and reverses.
    This causes the surface of the ocean to become warmer and causes significant changes in the weather patterns around the Pacific and globally
    Natural
    Human
    Cooling
    Warming
  • Ice albedo effect
    Ice and snow (being white) reflect incoming solar radiation. Albedo means reflectivity.
    Where there is a lot of ice it reflects enough energy to reduce global temperature
    http://svs.gsfc.nasa.gov/vis/a010000/a010000/a010021/a010021_H264_640x480.mp4
    Natural
    Human
    Cooling
    Warming
  • Deforestation of Tropical Rainforests
    Tropical rainforest is a natural carbon sink (it absorbs a massive amount of carbon from the atmosphere), reducing CO2 levels.
    Evaporation from the Tropical Rainforest is very high and this causes clouds to form which reflect the sun’s energy
    When the rainforest is removed less CO2 is absorbed and less clouds form.
    Natural
    Human
    Cooling
    Warming
  • Fossil fuel burning
    Burning fossil fuels releases large quantities of CO2 into the atmosphere causing the enhanced greenhouse effect.
    Natural
    Human
    Cooling
    Warming
  • Deforestation of boreal (conifer) forest (in Siberia and Northern Canada)
    When forest is cleared in the far north it increases the albedo (reflectivity) of the earth because the forest is dark in colour and snow stays longer on the ground
    Natural
    Human
    Cooling
    Warming
  • Volcanic activity
    Large volcanic eruptions create huge quantities of particles which encircle the earth in the upper atmosphere.
    These reflect radiation and shade the earth for up to 5 years.
    Natural
    Human
    Cooling
    Warming
  • La Nina
    Occurs after El Nino. The Pacific circulation restarts, stronger than usual, this means that the surface waters have less time exposed to the sun, and to warm up.
    The ocean surface is cooler.
    Natural
    Human
    Cooling
    Warming