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Unformatted text preview: Earth100: The Carbon Cycle Carbon Cycle - 1. Flow of matter and energy 2. Introduction to Carbon 3. Organic Carbon Cycle Today: systems and the flow of matter (can also be applied to flow of energy) Systems Flow of Matter Components -> reservoirs Couplings -> Inputs or outputs Feedback loop - > cycle Equilibrium -> Steady cycle Residence time = average length of time matter spends in a reservoir Residence time = reservoir size/input = reservoir size/output A bathtub = example of reservoir When the flow of water into the tub equals flow out of the tub, its in a steady state If tub = 100 liters -> Residence time = 100 liters/5 liters per minute = 20 minutes input = 5 liters per minute Set the tub drain so that the flow of water down the drain is proportional to the size of the reservoir o Outflow = (amount of water in the tub) x (scalding factor) Or Output = K(reservoir size) K = scalding factor Change in water over time Reservoir size/time = input - output At a steady state Input = output = K(reservoir size) Input size/K= reservoir size 1/K=reservoir size/input 1/K = reservoir size/input 1/K = resident time The Carbon Cycle : Carbon is cycled between reduce and oxidized forms by natural processes Organic Carbon : Inorganic Carbon : Chemically reduced chemically oxidized (biologically produced) (not biologically) Examples: coal, oil, flowers, Examples: coral reef, sea shells, CO2, CaCO3 Organic matter in soil, petroleum (Calcium Carbonate),...
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- Spring '07