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Carbon Cycle

Carbon Cycle. Carbon. Carbon exists in the nonliving environment as: Carbon dioxide (CO2) Carbonic acid ( HCO 3 − ) Carbonate rocks (limestone and coral = CaCO 3 ) Deposits of Fossil fuels Dead organic matter. Organic Carbon. Hydrocarbons: CH 4 Carbohydrate: CH 2 O.

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Carbon Cycle

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  1. Carbon Cycle

  2. Carbon Carbon exists in the nonliving environment as: • Carbon dioxide (CO2) • Carbonic acid ( HCO3−) • Carbonate rocks (limestone and coral = CaCO3) • Deposits of Fossil fuels • Dead organic matter

  3. Organic Carbon • Hydrocarbons: CH4 • Carbohydrate: CH2O

  4. Inorganic carbon • Carbon Dioxide: CO2 • Calcium Carbonate: CaCO3 Mandale Limestone Quarry

  5. Carbon reservoirs

  6. Carbon reservoirs • The atmosphere. • The biosphere (include fresh water systems and non-living organic material, such as soil carbon). • The oceans ( including dissolved inorganic carbon and living and non-living marine biota). • The lithosphere (sediments, Earth core including fossil fuels).

  7. Carbon Cycle

  8. Carbon is released into the atmosphere in several ways • Respiration by plants and animals. • Decay of animal and plant matter. • Combustion of organic material • Production of cement. • The ocean releases CO2 into the atmosphere. • Volcanic eruptions and metamorphism

  9. Carbon is taken from the atmosphere in several ways • Photosynthesis. • The oceans when the seawater becomes cooler, more CO2 dissolve and become carbonic acid. • In the upper ocean areas organisms convert reduced carbon to tissues, or carbonates.

  10. Photosynthesis • CO2 + H2O + sunlight  CH2O + O2

  11. Respiration • CH2O + O2 CO2 + H2O + energy

  12. Combustion or Oxidization of hydrocarbon CH4 + 2 O2 CO2 + 2 H2O + energy

  13. Human Impacts on the Carbon Cycle Burning fossil fuels have serious impact on the carbon cycle.

  14. Fossil Fuel 86% of global primary energy consumption is fossil fuels.

  15. Fossil Fuels • Petroleum • Natural Gas • Coal

  16. CO2 Concentration Pre-Industrial value: 280 ppm (600 billion tons) Current value: 380 ppm (800 billion tons) Critical value: 560 ppm (1200 billion tons)

  17. Keeling Curve

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