Natural causes of Climate change

  • Created by: amtani20
  • Created on: 08-02-18 20:17
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  • Natural causes of climate change
    • Sunspots
      • Black spots on the suns surface
      • Number of sunspots increases from min to max to min over a 11 year period
      • Maximum sunspots means more heat and solar flares
      • Minimum reduces solar output and therefore lower temperatures
      • Very few in 1645-1715 coincided with little ice age
    • The Milankovitch cycles
      • Precession
        • Natural wobble of earth lasting 26,000 year cycle
        • Causes difference in hemisphere climates with closer having warmer weather
      • Eccentricity
        • Earth's orbit changes from circular to elliptical back to circular every 100,000 years
        • The earth is further from the sun in elliptical orbit and so less solar radiation
      • Axial Tilt
        • Earth's axis moves between two extremes 21.5 and 24.5 degrees in 41,000 years
        • Increased tilt will cause summers to be warmer and winters colder
    • Volcanic activity
      • Small droplets cans spread worldwide in the stratosphere for months causing wide spread cooling
      • Large volcanic ash particles could block out sun causing cooling
        • Short term cooling
      • Fine droplets convert sulfur dioxide into sulphric acid that refelcts the sun's radiation
        • Long last cooling
          • Small droplets cans spread worldwide in the stratosphere for months causing wide spread cooling

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