Cerling and Quade, Stable carbon and oxygen isotopes in soil carbonates.

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Presentation transcript:

Cerling and Quade, 1993. Stable carbon and oxygen isotopes in soil carbonates

Anthropogenic CO2

Carbonate solution chemistry CaCO3 + H2O + CO2  Ca2+ + 2HCO3-

Romanek, Grossman, and Morse, 1992 Faure and Mensing

Biological Carbon Pump

Diagenesis

Diagenesis

Paleo-CO2 proxy?

d13C of terrestrial carbonates in equilibrium with various carbon sources Final d13C value is a result of mixing of the four various reservoirs Dominated by Soil-respired CO2 and hence vegetation type contributing OM to soils

Dorale et al. 1998. Science, Vol 282, Issue 5395, 1871-1874

Extra slides

Bradley, 1999. Paleoclimatology

Bradley, 1999. Paleoclimatology

From: Koch, P.L., 1998. Ann. Rev. Earth Plan. Sci., 26: 573-613

From: Koch, P.L., 1998. Ann. Rev. Earth Plan. Sci., 26: 573-613

From: Koch, P.L., 1998. Ann. Rev. Earth Plan. Sci., 26: 573-613

Evolution of horses and C4 vegetation