Chromophoric dissolved organic matter

Repeta DJ, Hartman NT, John S, Jones AD, Goericke R (2004) Structure Elucidation and Characterization of Polychlorinated Biphenyl Carboxylic Acids as Major Constituents of Chromophoric Dissolved Organic Matter in Seawater. Environ Sci Tech 38 5373... 

Green, S. A., and N. V. Blough. 1994. Optical absorption and fluorescence properties of chromophoric dissolved organic matter in natural waters. Limnology and Oceanography 39 1903-1916. 

Boehme, J., and Wells, M. (2006). Fluorescence variability of marine and terrestrial colloids Examining size fractions of chromophoric dissolved organic matter in the Damariscotta River estuary. Mar. Chem. 101, 95-103. 

Humic substances represent a large fraction of what is termed chromophoric dissolved organic matter (CDOM) in aquatic systems around the world. Aquatic humic substances can be further categorized as fulvic acids, humic acids, and humin based on theis solubility in acid and base solutions. 

Chromophoric dissolved organic matter organic compounds such as humic and fluvic acids that form from decomposing organic matter, and absorb light at the blue end of the spectrum giving water a yellowish-brownish color at high concentrations. 

DOM, and in particular dissolved humic substances give, depending on their concentration, a yellowish or brown colour to the natural waters. To underline the fact that the light-absorbing components, and, thus, those that are photochemically active, are also responsible for the colour, the term coloured (or chromophoric) dissolved organic matter (CDOM) [24,25] has been proposed for use in environmental photochemistry literature, and will be used here. 

Steinberg, D. K., Nelson, N. B., Carlson, C. A., andPrusak, A. (2004). Production of chromophoric dissolved organic matter (CDOM) in the open ocean by zooplankton and the colonial cyanobacterium Trichodesmium spp. Mar. Ecol. Prog. Ser 267, 45—56. 

Osbum C. L., Zagarese H. E., Morris D. P., Hargreaves B. R., aud Cravero W. E. (2001) Calculatiou of spectral weighting functions for the solar photobleaching of chromophoric dissolved organic matter in temperate lakes. Limnol. Oceanogr. 46, 1455-1467. 

N.V. Blough, R. Del Vecchio (2002). Chromophoric dissolved organic matter (CDOM) in the coastal environment. In D.A. Hansell and C.A. Carlson (Eds). Biogeochemistry of Marine Dissolved Organic Matter (pp. 509-546), Academic Press. 

F.E. Hoge, A. Vodacek, N.V. Blough (1993). Inherent optical properties of the ocean Retrieval of the absorption coefficient of chromophoric dissolved organic matter from fluorescence measurements. Limnol. Oceanogr., 38,1394-1402. 

The depth of vertical mixing may also be directly affected by increased UVR. In many systems (particularly fresh waters), the major component responsible for determining UVR penetration, chromophoric dissolved organic matter (CDOM), is also the primary absorber of visible radiation. Absorption of solar radiation by CDOM results in near-surface heating and shallow stratification [10,11]. However, CDOM absorbance is not constant, due to photobleaching by UVR [12]. As CDOM bleaches, there is deeper penetration of solar radiation and less pronounced surface heating, allowing deeper mixed layers to develop ([13] also see Chapters 3 and 6). 

R.F. Whitehead, S. de Mora, S. Demers, M. Gosselin, P. Monfort, B. Mostajir (2000). Interactions of ultraviolet-B radiation, mixing, and biological activity on photo-bleaching of natural chromophoric dissolved organic matter A mesocosm study. Limnol. Oceanogr., 45, 278-291. 

Photochemistry of chromophoric dissolved organic matter in natural waters... 

Hong, H. et al.. Absorption and fluorescence of chromophoric dissolved organic matter in the Pearl River Estuary, South China, Mar. Chem., 97, 78, 2005. 

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