Carbon cycles, global geochemical

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Milliman JD (1993) Production and accumulation of calcium carbonate in the ocean budget of a non-steady state. Global Geochem Cycles 7 927-957... 

Arthur M. A. (2000) Volcanic contributions to the carbon and sulfur geochemical cycles and global change. In Encyclopedia of Volcanoes (eds. H. Sigurdsson, B. E. Houghton, S. R. McNutt, H. Rymer, and J. Stix). Academic Press, San Diego, pp. 1046—1056. 

Schmidt M. W. I. and Noack A. G. (2000) Black carbon in soils and sediments analysis, distribution, implications, and current challenges. Global Geochem. Cycles 14(3), 777-793. 

Walker J. C. G. (1994) Global geochemical cycles of carbon. In Regulation of Atmospheric CO2 and O2 by Photosynthetic Carbon Metabolism (eds. N. E. Tolbert and J. Preiss). Oxford University Press, Oxford, pp. 75-89. 

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Kuhlbusch, T. A. J., and P. J. Crutzen, Toward a Global Estimate of Black Carbon in Residues of Vegetation Fires Representing a Sink of Atmospheric C02 and a Source of 02, Global Bio-geochem. Cycl., 9, 491-501 (1995). 

In the process of the global cycle, mobile carbon repeatedly crosses the Earth s surface. Over the surface, playing the role of the geochemical barrier , it circulates mainly in the oxidized form (C02), and under the surface mainly in the restored form (CH4). This fact requires a study of the global cycles of C02 and CEI4. 

Figure 1.5 extends this notion to the geochemical level which shows an estimate of the influence of the global biosphere carbon and oxygen cycles on the fluxes of major elements through the terrestrial reservoirs, and includes the effects of both primary and secondary biogeochemical processes. 

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