Organic carbon cycle

THORIUM AND POLONIUM AS TRACERS FOR ORGANIC CARBON CYCLING IN THE OCEANS... 

Kvenvolden, K.A. (2002). Methane hydrate in the global organic carbon cycle. Terra Nova, 14 (5), 302-306. 

Schiff, S. L., R. Aravena, S. E. Trumbore, and P. J. Dillon. 1990. Dissolved organic carbon cycling in forested watersheds A carbon isotope approach. Water Resources Research 26 2949-2957. 

Miller, W. L., and R. G. Zepp. 1995. Photochemical production of dissolved inorganic carbon from terrestrial organic matter Significance to the oceanic organic carbon cycle. Geophysical Research Letters 22 417-420. 

There is a strong need both from a scientific and practical viewpoint for a more quantitative understanding of the inorganic and organic carbon cycles and their interactions immediately prior to important human intervention in these cycles. 

Schiff, S.L., Aravena, R., Trumbore, S.E., and Dillon, P.J. (1990) Dissolved organic carbon cycling in forested watersheds a carbon isotopic approach. Wat. Res. 26, 2949-2957. 

Wetzel, R.G. Organic carbon cycle and detritus. p. 538-621, jn "Limnology," Chapter 17. Saunders. Philadelphia, 1975. 

Fig. 27. Calculated dependence of the isotopic composition of sedimentary carbonates on CO2 and CH4 ratios in the atmosphere (after Galimov et al.) A = calculated values of isotopic composition of carbonates in the absence of an organic carbon cycle B = same, taking account of the organic carbon cycle. S C = 1 experimental values of investigated Precambrian carbonates.

Ziegler, S., and Benner, R. (1999). Dissolved organic carbon cycling in a subtropical seagrass-dominated lagoon. Mar. Ecol. Prog. Ser. 180, 149—160. 

Repeta, D. J., and Aluwihare, L. I. (2006). Radiocarbon analysis of neutral sugars in high-molecular-weight dissolved organic carhon Imphcations for organic carbon cycling. Limnol. Oceanogr. 66, 1045-1053. 

Figure 1 The global organic carbon cycle. Numbers in parentheses are approximate reservoir sizes (10 g C = Gt) and italicized are approximate fluxes (10 gCyr ). Nonitalicized numbers are approximate ranges for stable carbon isotopic compositions (S C, per mil) and italicized numbers are approximate radiocarbon ages...

WoUast R. (1991) The coastal organic carbon cycle fluxes, sources, and sinks. In Physical, Chemical, and Earth Sciences Research Report, vol. 9, pp. 365—381. 

Heggie D. T., Skyring G. W., O Brien, Reimers C., Herczeg A., Moriarty D. J. W., Burnett W. C., and Milnes A. R. (1990) Organic carbon cycling and modern phosphorite formation on the east Australian continental margin an overview. In Phosphorite Research and Development. Geol. Soc. Spec. Publ. 52 (eds. A. G. J. Notholt and I. Jarvis), pp. 87-117. 

The interaction between the carbonate cycle and the organic carbon cycle takes place under a variety of circumstances. At one end of the spectrum, carbonate chemistry may be under direct enzymic control (see Chapter 2.2). It may take place within cells, within organisms, or within micro-environments in close contact with living tissues (e.g., molluscan mantle). At the other extreme, where products of metabolic activities modify the overall chemistry of the environment, carbonate dissolution or precipitation may be influenced indirectly. The closer the contact between the organism and the substrate, the more specific are the biogenic dissolution and crystallization patterns that remain as traces of biological activity in sediments. 

C.L. Osburn (2000). Photochemical Changes in the Dissolved Organic Matter of Temperate Lakes Implications for Organic Carbon Cycling and Lake Transparency (100 pp.). Lehigh University, Bethleham, PA. 

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