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Ozone layer & carbon cycle

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Transcript

  • 1. Ozone Layer and Other Atmospheric Cycles Presented by: Arnel O. Rivera LPU-Cavite
  • 2. Review:
    • The blanket of air around the earth is called the atmosphere . 
    • It is divided into three layers:
  • 3. Meteorology
    • Deals with the study of climate and weather.
    • Is the study of the changes in temperature, air pressure, moisture, and wind direction.   
  • 4. What is the Ozone Layer?
    • The thin layer of gas in the upper atmosphere that shields the earth from harmful ultraviolet rays.
    • It is composed of three oxygen atoms bounded together (O 3 )
    • A continent size hole has formed over Antarctica as result of the damage over the ozone layer.
    • Ozone layer depletion is believed to be at a rate of 5% every 10 years.
  • 5. What are the causes of Ozone Depletion?
    • There are three main contributors to the ozone problem: human activity, natural sources, and volcanic eruptions .
  • 6. Causes of Ozone Depletion
  • 7.
    • Human activity is by far the most prevalent source of ozone depletion.  Human activity, such as the release of various compounds containing chlorine or bromine, accounts for approximately 85 percent of ozone damage.  Perhaps the most evident and destructive molecule of this description is chloroflourocarbon (CFC).
    •  
  • 8.
    • CFCs were first used to clean electronic circuit boards, and as time progressed, were used in aerosols and coolants, such as refrigerators and air conditioners.  When CFCs from these products are released into the atmosphere, the destruction begins.  The molecules float toward the ozone rich stratosphere.  Then, when UV radiation contacts the CFC molecule, this causes one chlorine atom to liberate. 
  • 9.
    • This threatening chlorine atom then continues the cycle and results in further destruction of the ozone layer  Measures have been taken to reduce the amount of CFC emission, but since CFCs have a life span of 20-100 years, previously emitted CFCs will do damage for years to come.
  • 10. Ozone Depletion Process
  • 11. Carbon Cycle
    • Sequence by which carbon circulates and is recycled through the natural world.
    • Carbon dioxide is released in the atmosphere by living things as a result of respiration.
    • The CO 2 is taken up and converted to carbohydrates during photosynthesis by plants.
  • 12.
    • When animals eats plants, carbon is transferred to the animal body.
    • Carbon is then released back through decomposition of dead animal and plant matter.
    • Carbon is also released to the atmosphere through the burning of fossil fuels such as coal.
  • 13. Disruption of the Carbon Cycle
    • Today, carbon cycle is in danger of being disrupted by the increased consumption of fossil fuels and deforestation. As a result, levels of CO 2 are building up in the atmosphere contributing to the greenhouse effect.