6_carbon_cycle - Carbon Cycle Organic Carbon Reduced form...

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Carbon Cycle Organic Carbon Reduced form Bonded to C, H, or N Compounds formed by living organisms Inorganic Carbon Oxidized carbon
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Carbon Cycle Short-term cycle Biosphere/atmosphere interactions Residence times = days to years Intermediate-term cycle Ocean/atmosphere/biosphere interactions Residence times = 100 to 1000 years Long-term cycle Geosphere/atmosphere/hydrosphere interactions Residence times = millions of years
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Carbon Cycle Global carbon reservoir = 10 23 g Units = gigatons of carbon = 10 15 g C Also = 1 Pg (petagram) Reservoirs from largest to smallest
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Carbon Reservoirs Ruddiman Fig. 3-3a Atmosphere now ~790
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Carbon Cycle Ruddiman Fig. 3-3b Atmosphere increasing by ~3gT/yr
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Carbon Cycle Ruddiman- focuses on long-term ~ steady state Input and output rates balanced Rates are linked to size of reservoirs Large reservoirs slow exchange IPCC cycle Greater focus on anthropogenic effects Lack of steady state
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IPCC Carbon Cycle Note: Anthro effects Note: Ocean = net sink Houghton et al, 1990 Fossil fuels + deforest now 8.5 35 66,000,000
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Carbon Cycle Typical residence times Plants (roots) ~ 10’s yrs Atmosphere ~ 4 yrs Soils ~50 yrs Oceans ~ 350 yrs-1500 yrs Sediments ~150 m.y. Short Intermediate Long
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Short-term Cycle Photosynthesis (converts inorganic carbon to organic carbon) CO 2 + H 2 O CH 2 O + O 2 Reverse reaction CH 2 O + O 2 CO 2 + H 2 O - Respiration - Decay - Nutrient regeneration - Also anaerobic fermentation 2CH 2 O CO 2 + CH 4
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This document was uploaded on 07/08/2011.

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6_carbon_cycle - Carbon Cycle Organic Carbon Reduced form...

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