Abstract
Most of the solar radiation that reaches land or water is converted into thermal energy, but a significant part, especially that in the ultraviolet and visible region, is diverted into photochemical and photobiological processes that affect the global carbon cycle. The most prominent photobiological process on the earth’s surface is biological photosynthesis. Terrestrial vegetation and marine algae use the solar energy to convert annually approximately 100 Gt (gigatons) of carbon in the form of atmospheric carbon dioxide (CO2) into organic matter (Zepp 1994). When plants and algae die, the resulting non-living matter is transformed by various biological and chemical processes that either convert it back to CO2 (and other trace carbon gases) and water or to biologically refractory organic substances. The refractory organic matter is a mixture of substances, including litter and more refractory compounds, a large portion of which consists of humic substances (Thurman 1985). The term “humic substances” is usually used to refer to the organic matter that has been isolated from natural waters or from soils using well-defined techniques (Frimmel and Christman 1988; Huber and Frimmel 1994). Humic substances make up the largest single class of dissolved organic matter (DOM), accounting for 30 to 60% of the DOM in most natural waters (Thurman 1985). [The term “dissolved organic matter, DOM” is here used as synonym of “dissolved organic carbon, DOC.”] The term “colored dissolved organic matter (CDOM)” is used for the fraction of DOM that is colored (Blough and Green 1995) and includes humic substances. Based on Orinoco River data, Blough et al. (1993) estimated that only about 65% of the total DOM absorbs solar radiation and is subject to direct photochemical reactions (see Table 3.1).
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Sulzberger, B. (2000). Photooxidation of Dissolved Organic Matter: Role for Carbon Bioavailability and for the Penetration Depth of Solar UV-Radiation. In: Gianguzza, A., Pelizetti, E., Sammartano, S. (eds) Chemical Processes in Marine Environments. Environmental Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04207-6_4
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DOI: https://doi.org/10.1007/978-3-662-04207-6_4
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