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6.1-6.3 The Carbon Cycle - Coggle Diagram
6.1-6.3 The Carbon Cycle
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STORES
Lithosphere: over 99.9% of c stored in sedimentary rocks e.g. limestone. 0.004% stored in fossil fuels
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Hydrosphere: co2 dissolved in rivers lakes oceans. Oceans are the 2nd biggest store of c= 0.04%. predominant form is inorganic dissolved carbon in deep ocean. small amount at ocean surface is exchanged w atmosphere
Biosphere: organic c in tissues of living organisms. transferred to soil when organism decomposes (break down of organic matter)=0.004%
Cryosphere: less than 0.01%. most c in soil areas of permafrost, where decomposing plants and organism have frozen
FLUXES
vary spatially
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continental scale: all fluxes including sequestration. more resp and phs in northern hemisphere bc more landmass. more ocean sequestration in southern
vary in timescale
phs, resp, decomposition, combustion only take minutes, hrs days
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around 180 gt of c released into atmosphere due to fossil fuel combustion. small in comparison to naturally transferred amounts but enough to alter concentration of ghg to trigger climate change
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CO2 fluxes vary with latitude. CO2 levels higher in northern hemisphere bc greater landmasses greater temperature variations than southern hemisphere
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Ocean sequestration
carbon moves between atmosphere, surface water and deepwater through three interconnected pumps
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