class21_w08

class21_w08 - CO2 links the atmospheric carbon cycle and...

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CO 2 links the atmospheric carbon cycle and photosynthesis, with the carbonate reactions in the lithosphere (inorganic carbon cycle) Inorganic C cycle : Rock weathering Precipitation of CaCO 3 in the oceans Conversion of carbonate to calcium silicates + CO 2 Geologic phases of both cycles operate over millions of years
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Inorganic carbon cycle Dissolution of limestone (weathering) – removes CO 2 from atmosphere CO 2 + H 2 O + CaCO 3 Ca 2+ + 2HCO 3 - Precipitation of carbonate in oceans – results in CO 2 outgassing Ca 2+ + CO 3 2- CaCO 3 (s) 2 HCO 3 - CO 3 2- + H 2 CO 3 H 2 CO 3 CO 2 + H 2 O Weathering of terrestrial carbonates consumes the same amount of CO 2 as is released when carbonates precipitate in the ocean.
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CO sequestration
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Development of photosynthesis explains the abundance of oxygen on Earth T = -63°C, P = 0.01 T = 500°C, P = 100 T = 15°C, P = 1
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Carbonate chemistry in natural waters inorganic portion of global C cycle 1. There are many relevant equilibria in the carbon system
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class21_w08 - CO2 links the atmospheric carbon cycle and...

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