Abstract
Dissolved organic matter (DOM) is a poorly-defined mixture of mainly naturally occurring substances in water. However, it has operational and qualitative properties that have significant effects on aquatic ecosystems. Operationally, DOM passes through most common filters and is composed mainly of organic matter. DOM is a significant source of carbon fueling microbial metabolism (Wetzel et al. 1995) and attenuates significantly the penetration of photosynthetically active and damaging ultraviolet radiation (Scully & Lean 1994; Schindler et al. 1996). Climate affects DOM by altering the rates or quality of DOM loading, and the rates of in situ loss or transformation (Schindler et al. 1992; Curtis & Schindler 1997). Concentrations of DOM in lake waters depend on loading, in situ loss and production, and on dilution or concentration from exchange of water directly with the atmosphere (precipitation and evaporation). Thus, quality of organic matter in surface waters depends on biologic and hydrologic properties of the system and on regional climate.
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Curtis, P.J. (1998). Climatic and Hydrologic Control of DOM Concentration and Quality in Lakes. In: Hessen, D.O., Tranvik, L.J. (eds) Aquatic Humic Substances. Ecological Studies, vol 133. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03736-2_5
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DOI: https://doi.org/10.1007/978-3-662-03736-2_5
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