Climates 21 3
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Climates 21 3

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Climates 21 3 Climates 21 3 Presentation Transcript

  • 21.3 Climates changes
  • Natural processes that change climate
  • Volcanic eruptions
    • The presence of aerosols (volcanic ash, dust, and sulfur- based aerosols) in the air increases the amount of solar radiation that is reflected back into space. Earth lower atmosphere to cool.
  • Ocean circulation
    • The changes in ocean circulation also can result in short-terms climates fluctuations.
  • Solar activity
    • When the sun is most active, it contains dark blemishes called sunspots.
  • Earth Motions
    • These geographic changes in earth’s land and water bodies cause change in climate.
    • Changes in the shape of earth’s orbit and the tilt of earth on its axis are other earth motions that affect global climates.
  • Human impact on climate changes
    • Human activities have contributed and will contribute to global climates change. Also natural processes have certainly contributed to many climates changes throughout earths 4.6-billion year history.
  • The Greenhouse Effect
    • The greenhouse effect is a natural warming of both earth’s lower atmosphere and earth’s surface.
  • Global Warming
    • As A result of increases in carbon dioxide levels, as well as other green house gases, Global temperatures have increased. This increase is called Global Warming.